Professional Service

ACADEMIC COMMITTEE SERVICE


University Committees


  • UC Sigma Xi Chapter, Member of the Advisory Board, three year term (October 8, 2012-Dec. 31, 2015).
  • UC Sigma Xi Chapter, Member of the Committee for Selection of SX Young Investigator Award, (January 2013, January 2014).
  • University Research Council, Member of the Physical Science and Engineering Subcommittee for review of Graduate Student Summer Research Fellowships, 2013-2014 academic year.
  • Member of the Europe Strategy Group, 2013-2014 academic year.
  • Research Grant Committee, since April 2007.
  • University Research Council, Member of the Physical Science and Engineering Subcommittee, September 1 2003-August 30 2005; Chair 2004-2005.


College Committees


  • College of Engineering, Reappointment, Promotion, & Tenure (RPT) Committee, chair for 2011/2012 and 2012/2013 academic years and member Summer 2010-Spring 2013.
  • College of Engineering Research Co-op Committee, Member since Spring 2007.
  • Department of Civil and Environmental Engineering-Representative of the CEE Curriculum Committee in the College of Engineering Curriculum Committee, January 1 2006-June 30, 2006.
  • Department of Civil and Environmental Engineering-Representative of the CEE Undergraduate Awards & Scholarships in the College of Engineering Committee, member since April 2007.

School/Departmental Committees


  • Director of Graduate Students, Division of Environmental Engineering and Science, since June 2006.
  • Advisor for the Environmental and Chemical Engineering GSA group, since 2014.
  • Curriculum Committee, Department of Civil and Environmental Engineering, Member since Sep. 1. 2005.
  • Division of Environmental Engineering and Science, Graduate Admissions Committee – Member since September 2000 and Chair during Sep. 1, 2002-Aug. 31, 2004 and Sep. 1 2005-Aug. 31 2006.
  • Examination Committee of the Annual Ph.D. Qualifying Exams, EES Division, Examiner in 2000, 2001, 2002 and Chair since June 2006.
  • CEE ACCEND Committee (BS Civil/MS Environmental), Member since Sep. 1 2005.
  • CEE Department, Reappointment, Promotion, & Tenure (RPT) Committee, Member since Summer 2006-2010.
  • CEE Department, Undergraduate Awards & Scholarship Committee, Member since Summer 2006.
  • Department of Civil and Environmental Engineering-Representative of the CEE Curriculum Committee in the College of Engineering Curriculum Committee, January 1 2006-June 2006.
  • Division of Environmental Engineering and Science, Member of the Outreach Committee, Sep. 1 2004-present.
  • Search committee for hiring a new faculty member in the areas of Hydrology and Particle Transport (2006)
  • Search committee for hiring two new faculty member in the areas of Construction and Transportation (2004)
  • Search committee for hiring a new faculty member in the area of Air Quality/Air Pollution Control (2001)


UNIVERSITY AND COLLEGE / COMMUNITY SERVICE


  • Served as Judge for the Poster Competition for: (1) NSF REU Site Program Trainees in Membrane Applied Science and Technology and (2) ASPET SURF Program Dalton/Zannoni Fellows: Pharmacology, Toxicology and Pharmaceutical Sciences, August 16, 2007.
  • Served as judge for the Annual Poster Competition of the Graduate Students, Annual Graduate Recruitment Weekend, Spring 2000-present. 
  • Assisted The Bridge to the Future Alumni Reception and Provided Poster Displays, since my appointment (every October).
  • Assisted with College Visitation Days, since my appointment in Fall 2000.
  • Assisted in the Efforts for Undergraduate Enrolment, Jan. 2002-present.
  • Organized special workshops and instrumentation training sessions on Atomic Absorption Spectroscopy and GC/MS for enhancing research skills of the graduate students at the Department of Civil and Environmental Engineering, University of Cincinnati


PROFESSIONAL AFFILIATIONS


     1.  American Association for the Advancement of Science (AAAS)

  • Member 1999-2003


    2.  American Chemical Society (ACS)

  • Member since 1998
  • Member of the Division of Industrial and Engineering Chemistry (since 1998)
  • Member of the Division of Colloid and Surface Chemistry (since 2000)
  • Member of the Division of Physical Chemistry (since 2000)
  • Member of the Division of Environmental Chemistry (since 2000)
  • Member of the Division of Inorganic Chemistry (since 2003)
  • Member of the Division of Nuclear Chemistry (2000-2003)


     3.  American Institute of Chemical Engineers (AIChE)

  • Member 1993-2007


     4.  American Nano Society

  • Member since May 15, 2011


     5.  American Society of Engineering Education (ASEE)

  • Member 2001-2004


     6.  American Water Works Association (AWWA)

  • Member of both the National Association and the Ohio Chapter
  • Member since 2000


     7.  Association of Environmental Engineering and Science Professors (AEESP)

  • Member since 2000


     8.  Federal Water Quality Association (FWQA)

  • Member since 2002


     9.  International Ultraviolet Association (IUVA)

  • Member since 1999


     10. International Water Association (IWA)

  • Member since 2002


     11. Materials Research Society

  • Member since 2005-2006


     12. North American Catalyst Society and Tri-State Catalysis Society

  • Member since 2001


     13. Sigma Xi, The Scientific Research Society

  • Member since 2001


     14. Water Environment Federation (WEF)

  • Member of the National Association and the Ohio Chapter
  • Member since 1996


     15. Member of Great Lake Beach Association

  • Member since 2011


PROFESSIONAL SERVICE


Editorial Activity (International/National)


  • Editor, Chemical Engineering Journal (Elsevier), (since Nov. 1, 2009)
  • Editor, Journal of AOTs (Advanced Oxidation Technologies), (since January 1, 2008).
  • Special Issue Editor and Associate Editor, Journal of Environmental Engineering, American Society of Civil Engineers (ASCE) (since June 1, 2002).
  • Associate Editor, Water Environment Research, Water Environment Federation (WEF) (September 20, 2006-September 1, 2011).
  • Member of Editorial Board, Applied Catalysis B: Environmental (Elsevier) (since Sep. 1, 2004).
  • Member of Editorial Board, Journal of Hazardous Materials (Elsevier) (since May 15, 2010).
  • Member of Advisory Board, Environmental Science: Water Research & Technology (Royal Society of Chemistry) (since March, 2015)
  • Member of Editorial Board, Environmental Technology Reviews (Taylor & Francis) (since Nov. 16, 2011).
  • Member of Editorial Board, Advanced Science Letters (since June 1, 2007).
  • Member of Editorial Board, International Journal of Photoenergy (Hindawi) (since January 13, 2009).
  • Member of Editorial Board, International Journal of Water Sciences (InTechi) (since November 19, 2012).
  • Member of Editorial Board, Catalysts (MDPI, Basel, Switzerland) (since May 1, 2011).
  • Member of Editorial Board, Membranes (MDPI, Basel, Switzerland) (since June 22, 2010).
  • Member of Editorial Board, Nanomaterials and the Environment (since January 2012)
  • Member of Editorial Board, Nanomaterials and Nanosciences (since January 2012)
  • Member of Editorial Board, Current Environmental Engineering (Bentham Science) (since June 2014)
  • Member of Editorial Board, Water Conservation Science and Engineering (Springer) (since May 2015)
  • Member of Editorial Board, Journal of Advanced Oxidation Technologies (Jan. 1-Dec. 31, 2007).
  • Member of Editorial Board, Environmental Progress (now renamed as Environmental Progress and Sustainable Energy) (AIChE) (Dec. 14, 2003-Feb. 2009).
  • Guest Co-Editor, Water Research, Special Issue on Catalytic Processes and New Materials and Technologies in Water/Wastewater Treatment, Volume 86, December 2015, pp. 1-138, (Guest Editors: Dionysios Dionysiou, Gianluca Li Puma, Gregory Korshin, and Urs von Gunten).
  • Guest Co-Editor, Chemical Engineering Journal, Photocatalysis for Disinfection and Removal of Contaminants of Emerging Concern, Volume 261,  February 1, 2015, pp. 1-94 (Guest Editors: Suresh C. Pillai, Urška Lavrenčič Štangar, John A. Byrne, Alejandro Pérez-Larios, and Dionysios D. Dionysiou).
  • Guest Co-Editor, Environmental Science and Pollution Research, Special Issue on Advanced Oxidation Technologies: Advances and Challenges in Iberoamerican Countries (7th Congress of Environmental Application of Advanced Oxidation Technologies (7ºEPOA) and 1st Iberoamerican Congress of Advanced Oxidation Technologies (1ºCIPOA), Volume 22, January 2015, (Guest Editors: Vítor J. P. Vilar, Sixto Malato, and Dionysios D. Dionysiou).
  • Guest Co-Editor, Journal of Nanotechnology, Nanomaterials Synthesis, Applications, and Toxicity 2012, Volume 2013, pp. 1-44 (Guest Editors: Mallikarjuna Nadagouda, Dionysios D. Dionysiou, Darren A. Lytle, Thomas F. Speth, and Sharmila M. Mukhopadhyay).
  • Guest Co-Editor, Chemical Engineering Journal, Special Issue of the 7th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA7), Volume 224, 15 May 2013, pp. 1-148 (Guest Editors: Adrián M.T. Silva, Orlando M. Alfano, Dionysios D. Dionysiou, Gianluca Li Puma, Dionissios Mantzavinos).
  • Guest co-Editor, Journal of Hazardous Materials, Special Issue on Nanotechnologies for the Treatment of Water, Air and Soil, Volume 211-212, April 15, 2012, pp. 1-444, (Guest Editors: Marta I. Litter, Wonyong Choi, Dionysios D. Dionysiou, Polycarpos Falaras, Anastasia Hiskia, Gianluca Li Puma, Thalappil Pradeep, and Jincai Zhao).
  • Guest co-Editor, Journal of Hazardous Materials, Special Issue on Nanotechnologies for the Treatment of Water, Air and Soil, Volume 211-212, April 15, 2012, pp. 1-444, (Guest Editors: Marta I. Litter, Wonyong Choi, Dionysios D. Dionysiou, Polycarpos Falaras, Anastasia Hiskia, Gianluca Li Puma, Thalappil Pradeep, and Jincai Zhao).
  • Guest Co-Editor, Journal of Environmental Engineering (ASCE), Special Issue on Advances in Research and Development of Sustainable Environmental Technologies, Volume 138, Number 3, March 2012, pages 231-389, (Guest Editors:  Chihpin Huang, Dionysios D. Dionysiou, and Maohong Fan).
  • Guest Co-Editor, Chemical Engineering Journal, Special Issue on Environmental Nanotechnology, Volume 170, Issues 2-3, 2011, pages 345-568 (Guest Editors:  Bingcai Pan, Dionysios D. Dionysiou, and X.S. Zhao).
  • Guest Co-Editor, Journal of Environmental Quality (published by the American Society of Agronomy), Partial Special Issue on Environmental Occurrences, Behavior, Fate, and Ecological Effects of Nanomaterials, Volume 39, Issue 10, November 2010, pages 1867-1965 (Guest Editors: Gregory V. Lowry, Emily Bernhardt, Dionysios D. Dionysiou, Mark R. Wiesner, and Baoshan Xing).
  • Guest Editor, Journal TOXICON, Special Issue on Harmful Algal Blooms and natural Toxins in Fresh and Marine Waters: Exposure, Occurrence, Detection, Toxicity, Control, Management, and Policy, Volume 55, Issue 5, 2010 (Guest Editors: Dionysios D. Dionysiou, Armah de la Cruz, Judy Westrick).
  • Guest Editor, Journal of AOTs (Advanced Oxidation Technologies), August 2008 (Guest Editors: Dionysios. D. Dionysiou, Sixto Malato, Panagiotis Lianos, Gianluca Li Puma, Heechul Choi).
  • Guest Editor, Journal of AOTs (Advanced Oxidation Technologies), July 2008 (Guest Editors: Dionysios. D. Dionysiou, Sixto Malato, Panagiotis Lianos, Gianluca Li Puma, Heechul Choi).
  • Guest Editor, Journal of AOTs (Advanced Oxidation Technologies), January 2008 (Guest Editors: Dionysios. D. Dionysiou, Panagiotis Lianos, Gianluca Li Puma).
  • Guest Editor, Water Environment Research, partial special issue 2 on Groundwater, January 2007.
  • Guest Editor, Environmental Engineering Science, special issue on Environmental Nanotechnology, vol. 24, Number 1, January 2007 (Guest Editors: Dionysios. D. Dionysiou and Mark Wiesner).
  • Guest Editor, Journal of AOTs (Advanced Oxidation Technologies), January 2007 (Guest Editors: Nick Serpone and Dionysios. D. Dionysiou).
  • Guest Editor, Water Environment Research, partial special issue 1 on Groundwater, December 2006.
  • Guest Editor, Journal of Environmental Engineering, Vol. 128, Issue 9, September 2002, MTBE and Gasoline Oxygenates: Ex Situ and In Situ Treatment (Guest Editors: Makram T. Suidan, Dionysios. D. Dionysiou and George A. Sorial).


Committee Service (International/National)


  • American Chemical Society (ACS), Division of Environmental Chemistry, Program Chair since January 2008 and responsible for the Fall 2008 Annual Meeting and forward.
  • American Chemical Society (ACS), Division of Environmental Chemistry, Certificate of Merit Awards Committee, Co-Chair January 2007-September 2008.
  • American Chemical Society (ACS), Division of Environmental Chemistry Undergraduate Awards Committee, Chair since January 2007.
  • American Chemical Society (ACS), Green Chemistry Institute, Hancock Award Committee, since August 2007.
  • American Water Works Association (AWWA), Organic Contaminants Control Committee, Member since June 2004.
  • American Water Works Association (AWWA), Ph.D. Dissertation and M.S. Thesis Awards Committee, Two term member: Fall 2008-2011; 2011-2014.
  • Association of Environmental Engineering and Science Professors (AEESP), MS Thesis Awards Committee, Chair in 2007 and Member January 2005-December 2007.
  • Association of Environmental Engineering and Science Professors (AEESP), Education Committee, Member January 2003-Summer 2008.
  • Association of Environmental Engineering and Science Professors (AEESP), Distinguished Lecturer Committee, Member since Fall 2008.
  • Association of Environmental Engineering and Science Professors (AEESP)-American Chemical Society- Liaison Coordinator, since October 2008.
  • Center for the Environmental Implications of NanoTechnology (CEINT), Member of the External Review Panel since 2011.
  • Cincinnati Water Works: Water Quality Advisory Committee, Member since 2001.
  • International Organizing Committee of the Annual International Conferences on Advanced Oxidation Technologies, Member since 2003 and Chair in 2006-2008.
  • International Organizing Committee of the Annual International Conferences on TiO2 Photocatalysis, Member since 2001.
  • International Organizing Committee, The European Meetings on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA), Member since 2007.
  • National Research Council of Canada, Evaluator for Applications Submitted for the Steacie Prize.
  • Water Environment Federation (WEF), Groundwater Committee,
  • Co-Chair since October 2006 and Member since October 2003.
  • Water Environment Federation (WEF), McKee Medal Awards Committee,
  • Member since May 2007 (served for the 2007 and 2008 competitions).
  • Water Research Foundation, PAC Member on a project on “UV-Based Advanced Oxidation Treatment of Pre- and Post-GAC Contacted Water.” (2008-2010)
  • Water Reuse Foundation, PAC Member on a project on “Review of Nanomaterial Research and Relevance for Water Reuse.” (2010-2011) 
  • Young Professionals Committees of Ohio American Water Works Association (OAWWA) and Ohio Water Environment Association (OWEA) Member since 2001.


Reviewer


Peer-Reviewed Journals (International)


  • ACS Symposium Series (American Chemical Society)
  • ACS Applied Materials & Interfaces (American Chemical Society)
  • ACS Catalysis (American Chemical Society)
  • ACS Sustainable Chemistry & Engineering (American Chemical Society)
  • Advanced Functional Materials (Wiley)
  • Advanced Materials (Wiley)
  • Advances in Space Research (Elsevier)
  • AIChE Journal (American Institute of Chemical Eng., AIChE)
  • AIMS Environmental Science (AIMS Press)
  • Analyst (Royal Society of Chemistry)
  • Angewandte Chemie International Edition (Wiley)
  • Applied Catalysis A: General (Elsevier)
  • Applied Catalysis B: Environmental (Elsevier)
  • Applied Physics A (Springer-Verlag, Berlin/Heidelberg)
  • Applied Surface Science (Elsevier)
  • Applied Water Science (Springer)
  • Biomacromolecules (American Chemical Society)
  • Bioinorganic Chemistry and Applications (Hindawi)
  • Biotechnology and Bioengineering (John Wiley & Sons)
  • Catalysis Letters (Springer)
  • Catalysis Science & Technology (Royal Society of Chemistry)
  • Catalysis Today (Elsevier)
  • Catalysts (MPMDPI Publishing, Switzerland)
  • Chemical Communications (Royal Society of Chemistry)
  • Chemical and Biochemical Engineering Quarterly (CABEQ)
  • Chemical Engineering Journal (Elsevier)
  • Chemical Society Reviews (RSC)
  • Chemistry: A European Journal (Wiley)
  • Chemistry of Materials  (American Chemical Society)
  • Chemosphere (Elsevier)
  • CLEAN - Soil, Air, Water (Wiley)
  • Colloids and Surfaces A: Physicochemical and Engineering Aspects (Elsevier)
  • Crystal Growth and Design  (American Chemical Society)
  • Energy & Environmental Science (Royal Society and Chemistry)
  • Environmental Chemistry (Csiro Publishers)
  • Environmental Engineer and Scientist (American Academy of Environmental Engineers & Scientists)
  • Environmental Engineering Science (Mary Ann Liebert, Inc. Publishers)
  • Environmental Health Perspectives
  • Environmental Progress (American Institute of Chemical Eng., AIChE)
  • Environmental Science and Pollution Research (Springer)
  • Environmental Science and Technology (American Ceramic Society)
  • Environmental Science: Water Research and Technology (Royal Society of Chemistry)
  • Frontiers of Environmental Science & Engineering (Springer)
  • Frontiers in Physical Chemistry and Chemical Physics (Review Editor) (Frontiers)
  • Fuel Processing and Technology (Elsevier)
  • Industrial and Eng. Chemistry Research  (American Ceramic Society)
  • Inorganic Chemistry (American Ceramic Society)
  • International Journal of Chemical Kinetics (John Wiley & Sons)
  • International Journal of Chemical reactor Engineering (The Berkeley Electronic Press)
  • International Journal of Environmental Analytical Chemistry (Taylor & Francis)
  • International Journal of Environmental Technology and Management (IJETM)(Interscience)
  • International Journal of Mass Spectrometry (IJMS) (Elsevier)
  • International Journal of Photoenergy (Hindawi)
  • Journal of Advanced Oxidation Technologies (Science & Technology Network, Inc.)
  • Journal of the Air & Waste Management Association (Air & Waste Management Association)
  • Journal of the American Ceramic Society (American Ceramic Society)
  • Journal of the American Chemical Society (American Chemical Society)
  • Journal of Chemical Technology and Biotechnology (John Wiley & Sons)
  • Journal of Colloid and Interface Science (Elsevier)
  • Journal of Contaminant Hydrology (Elsevier)
  • Journal of the Chinese Institute of Chemical Engineers
  • Journal of Environmental Engineering (American Society of Civil Engineers, ASCE)
  • Journal of Environmental Engineering and Science (National Research Council Canada)
  • Journal of Environmental Quality (American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America)
  • Journal of the European Ceramic Society (Elsevier)
  • Journal of Fluorine Chemistry (Elsevier)
  • Journal of Hazardous Materials (Elsevier)
  • Journal of Materials Chemistry (Royal Society of Chemistry)
  • Journal of Materials Science (Springer)
  • Journal of Materials Science: Materials in Electronics (Springer)
  • Journal of Molecular Catalysis A (Elsevier)
  • Journal of Nanomaterials (Hindawi Publishing Corporation)
  • Journal of Nanoparticle Research (Kluwer)
  • Journal of Nano Research (Trans Tech Publications, Inc., Switzerland)
  • Journal of Nanoscience and Nanotechnology (American Scientific Publishers)
  • Journal of Photochemistry and Photobiology A: Chemistry (Elsevier)
  • Journal of Physical Chemistry B (American Chemical Society)
  • Journal of Physical Chemistry Letters (American Chemical Society)
  • Journal of Solar Energy Engineering (American Society of Mechanical Engineers, ASME)
  • Journal of Water and Health (IWA)
  • Journal of Water Resources Planning and Management (ASCE)
  • Journal of Water Supply: Research and Technology-AQUA
  • Langmuir (American Chemical Society)
  • Materials Chemistry and Physics (Elsevier)
  • Materials Research Bulletin (Elsevier)
  • Materials Science and Engineering B (Elsevier)
  • Microporous and Mesoporous Materials (Elsevier)
  • Monatshefte für Chemie (Springer)
  • Nanoscale (Royal Society of Chemistry)
  • Nanotechnology and the Environment (Versita),
  • New Journal of Chemistry (Royal Society of Chemistry)
  • Photochemical and Photobiological Sciences (Royal Society of Chemistry)
  • PLOS ONE (Public Library Science, USA)
  • Powder Technology (Elsevier)
  • Radiation Physics and Chemistry (Elsevier)
  • RSC Advances (Royal Society of Chemistry)
  • Science of the Total Environment (Elsevier)
  • Separation and Purification Reviews (Taylor & Francis)
  • Separation and Purification Technology (Elsevier)
  • Small (Wiley, VCH)
  • Soft Matter (Royal Society of Chemistry)
  • Solar Energy (Elsevier)
  • Spectroscopy Letters (Taylor & Francis)
  • Surface and Coatings Technology  (Elsevier)
  • The Arabian Journal for Science and Eng. (King Fahd Univ. of Petroleum and Minerals)
  • The Journal of Organic Chemistry (American Chemical Society)
  • Thermochimica Acta (Elsevier)
  • Thin Solid Films (Elsevier)
  • Topics in Catalysis (Springer Science)
  • Water, Air & Soil Pollution (Springer Science)
  • Water Environment Research (Water Environment Federation, WEF)
  • Water Research (International Water Association, IWA)
  • Water Science and Technology  (International Water Association, IWA)
  • Water Science and Technol.- Water Supply  (International Water Association, IWA)


Funding Agencies-Proposals


·         American Chemical Society (ACS)

·         American Water Works Association Research Foundation (AWWARF)

·         Czech Republic Science Foundation

·         Connecticut Institute of Water Resources, University of Connecticut

·         Department of Agriculture (DOA)

·         Environmental Protection Agency (Nanotechnology, Drinking Water, STAR, SBIR, EPA STAR Fellowships)

·         Estonia Science Foundation

·         Estonia-U.S. Bilateral Grants Program, U.S. Civilian Research & Development Foundation

·         ETH Zurich Research Commission for Scientific Evaluation

·         Georgian-U.S. Bilateral Grants Program, U.S. Civilian Research & Development Foundation

·         Greek Ministry for Education (Thalis and Archimedes programs)

·         Israel Science Foundation

·         Louisiana Board of Regents

·         Mexico - Marcos Moshinsky Foundation of Mexico

·         National Aeronautics and Space Administration (NASA)

·         National Institute of Health/National Institute of Environmental Health Sciences (NIH/NIEHS)

·         National Science Foundation (USA) (several divisions and programs)

·         Oak Ridge Associated Universities (ORAU) ORISE Postdoctoral Program

·         Ohio Water Resources Institute

·         Swiss Confederation, Federal Department of Home Affairs FDHA, State Secretariat for Education and Research SER

·         United Kingdom: the Natural Environment Research Council; the Engineering and Physical Sciences Research Council; the Department of Environment, Food and Rural Affairs; and the Environment Agency of England and Wales.

·         US-Egypt Collaborative Proposals

·         University of Wisconsin Water Resources Institute (WRI)

·         University of Wisconsin-Milwaukee Research Foundation

·         Water Reuse Foundation


ORGANIZER, CHAIR OR MEMBER OF ORGANIZING COMMITTEES & SESSIONS ORGANIZED OR CHAIRED

·         Member of the International Organizing Committee, The 6th International Conference on TiO2 Photocatalytic Purification and Treatment of Water and Air, June 26-29, 2001, Niagara Falls, Ontario, Canada.

·         Symposium Organizer (co-Organizer: Makram T. Suidan), Remediation of Water and Soil Contaminated with Gasoline Oxygenates: In situ and Ex situ Treatment Technologies, American Chemical Society, Chicago, Illinois, August 26-30, 2001.

·         Member of the International Organizing Committee, The 7th International Conference on TiO2 Photocatalytic Purification and Treatment of Water and Air, November 17-21, 2002, Toronto, Ontario, Canada.

·         Member of the International Organizing Committee, The 8th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 25-30, 2003, Montreal, Canada.

·         Member of the International Organizing Committee, The 9th International Conference on Advanced Oxidation Technologies for Water and Air Remediation, October 25-30, 2003, Montreal, Canada.

·         Chairman of the Symposium Session, Oxidation by Oxone and Sodium Chlorite, Advanced Oxidation Technologies for Water and Air Remediation, October 25-30, 2003, Montreal, Canada.

·         Member of the International Organizing Committee, The 9th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 24-28, 2004, San Diego, California.

·         Chair of the session “Water Treatment with Photo-Fenton Processes, The 10th International Conference on Advanced Oxidation Technologies for Water and Air Remediation, October 24-28, 2004, San Diego, California.

·         Symposium Organizer (co-Organizers: Linda K. Weavers and Wonyong Choi), Oxidation and Reduction Technologies for Water Treatment, AEESP-ACS Symposium (Division of Environmental Chemistry), 228th ACS National Meeting, August 22-26, 2004, Philadelphia, Pennsylvania.

·         Co-chair of the session on Environmental-Photocatalysis (chair Panagiotis Smirniotis, co-chair Edgar Moctezuma), 19th North American Catalysis Society Meeting (NAM), May 22-27, 2005, Philadelphia, Pennsylvania.

·         Symposium Organizer (co-organizers: Pratim Biswas, Gregory V. Lowry, and Mark Wiesner), Environmental Nanotechnology, AEESP-ACS Symposium (Division of Environmental Chemistry), 330th ACS National Meeting, August 28-September 1, 2005, Washington DC.

·         Chair of the session Nanocatalysis and Biocatalysis of the AEESP-ACS Symposium on Environmental Nanotechnology (Division of Environmental Chemistry), 330th ACS National Meeting, August 28-September 1, 2005, Washington DC.

·         Member of the International Organizing Committee, The 10th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 23-27, 2005, Chicago, Illinois.

·         Member of the International Organizing Committee, The 11th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, October 23-27, 2005, Chicago, Illinois.

·         Chair of the Session TiO2 Photocatalysis: Fundamental and Mechanistic Studies-II, The 10th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 23-27, 2005, Chicago, Illinois.

·         Chair of the session Nanomaterials for Treatment and Remediation, Session S6, Materials Research Society (MRS) Fall Meeting, November 28-December 2, 2005, Boston, Massachusetts.

·         Member of the Panel Discussion on Ethical and Legal Aspects of Nanomaterials and the Environmental Regulation, Session S8, Policy and Legal Approaches for Nanotechnology, Materials Research Society (MRS) Fall Meeting, November 28-December 2, 2005, Boston, Massachusetts.

·         Member of the International Scientific Committee, The First European Conference on the Environmental Applications of Advanced Oxidation Processes (EAAOP), September 7-9, 2006, Chania, Crete, Greece.

·         Chair of the session Disinfection, The First European Conference on the Environmental Applications of Advanced Oxidation Processes (EAAOP), September 7-9, 2006, Chania, Crete, Greece.

·         Member of the International Organizing Committee, The 11th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, September 25-28, 2006, Pittsburgh, Pennsylvania.

·         Chair of the International Organizing Committee, The 12th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 25-28, 2006, Pittsburgh, Pennsylvania.

·         Chair of the session Fenton-Based Advanced Oxidation Technologies, The 12th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 25-28, 2006, Pittsburgh, Pennsylvania.

·         Moderator/Chair of the sessions A and B on Chemical Oxidation for Water and Wastewater Treatment, The 37th Mid-Atlantic Industrial & Hazardous Waste Conference, March 21-23, 2007, Cincinnati, Ohio.  

·         Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the International Organizing Committee, The 13th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 24-27, 2007, Niagara Falls, New York.

·         Member of the International Organizing Committee, The 12th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, September 24-27, 2007, Niagara Falls, New York.

·         Co-Chair of the session Heterogeneous Photo-Fenton, The 13th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 24-27, 2007, Niagara Falls, New York.

·         Chair of the session Disinfection by AOTs, The 13th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 24-27, 2007, Niagara Falls, New York.

·         Co-Chair of the session Ozonation, UV/H2O2, Peroxidation, Electron-Chemical and Combined Advanced Oxidation Technologies, The 13th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 24-27, 2007, Niagara Falls, New York.

·         Co-Chair of the session Biological Applications, The 12th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, September 24-27, 2007, Niagara Falls, New York.

·         Chair of the session Modeling, The 12th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, September 24-27, 2007, Niagara Falls, New York.

·         Organizer of the Workshop on Advanced Oxidation Technologies in Water Treatment: Fundamentals and Applications, The 2007 Water Quality Technology Conference (WQTC), November 4-8, 2007, Charlotte, North Carolina.

·         Member of the International Organizing Committee, 1st International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, E. C. Aifantis, E. Kaxiras), June 16-18, 2008, Halkidiki, Greece.

·         Symposium Chair (with Co-Chairs: G. Kordas (NCSR Demokritos, Hellas) and Y. Sakka (National Inst. Mater. Sci., Japan)), Nano-Containers and Environmental Applications, Implications, and Ethics, 1st International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, E. C. Aifantis, E. Kaxiras), June 16-18, 2008, Halkidiki, Greece.

·         Member of the International Organizing Committee, The 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, September 22-25, 2008, San Diego, California.

·         Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the International Organizing Committee, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Chair of the session Non-Thermal Plasma and Sonolysis, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Chair of the session Fenton and Photo-Fenton-I, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the session Ozonation and Combined AOTs, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the session Semiconductor Photocatalysis, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Chair of the session Photolysis, Peroxidation, Peroxymonosulfate and Combined AOTs, The 14th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, September 22-25, 2008, San Diego, California.

·         Member of the International Organizing Committee, The 5th European Meeting on Solar Chemistry and Photocatalysis: Environmental Application, (SPEA 5) (Chairman: Prof. Leonardo Palmisano; co-Chairman: Prof. Vincenzo Augugliaro), October 4-8, 2008, Sicily, Italy.

·         Organizer (with Prof. Judy Westrick) of the session workshop Emerging Aspects on Harmful Algal Blooms and their Effects, ST2 Special Topic Session, AWWA Water Quality Technology Conference and Exposition, November 17, 2008, Duke Energy Center, Cincinnati, Ohio.

·         Organizer (with Dr. James Sinclair, Dr. Armah de la Cruz, and Prof. Judy Westrick) of the one-day workshop Emerging Aspects on Harmful Algal Blooms and their Effects on Drinking Water Quality, November 18, 2008, US Environmental Protection Agency, Cincinnati, Ohio.

·         Member of the International Scientific Committee, International Conference on Xenobiotics in the Urban Water Cycle, XENOWAC 2009, March 11-13, 2009, Limassol, Cyprus.

·         Chair of the session International Conference on Xenobiotics in the Urban Water Cycle, XENOWAC 2009, March 11-13, 2009, Limassol, Cyprus.

·         Member of the International Scientific Committee, The IASTED International Conference on Solar Energy (SOE 2009), March 16-18, 2009, Phuket, Thailand.

·         Chair of the session Nanotechnology and the Environment: Emphasis on Green Nanotechnology – Nanotechnologies for Environmental Cleanup, Division of Industrial & Engineering Chemistry (cosponsored by the Divisions of Inorganic Chemistry and NANO), March 22-26, 2009, Salt Lake City, Utah.

·         Member of the International Scientific Committee, International Conference on Water, Environment and Health Sciences (ICWEHS): The Challenges of the Climate Change, April 13-17, Universidad de las Americas-Puebla, Mexico.

·         Member of the International Organizing Committee, 2nd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, M. Sitti, C. Politis), June 28-July 3, 2009, Rhodes, Greece.

·         Co-chair (with P. Colomban) of the session Nano-Multidisciplinary NM-2, 2nd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, M. Sitti, C. Politis), June 28-July 3, 2009, Rhodes, Greece.

·         Co-chair and Open Floor Discussion Leader (with Claude Levy-Clement) of the session Nanotechnology Applications: Energy, Bio, Environmental at the Aegean Nanoscience and Nanotechnology Workshop, July 2-3, 2009, Rhodes, Greece.

·         Co-Chair (with Dr. V. Vilar) of Session 17: Fenton Processes 3, The 2nd European Conference on Environmental Applications of Advanced Oxidation Processes (EAAOP2), September 7-9, 2009, Nicosia, Cyprus.

·         Member of the International Scientific Committee, First International Workshop on Application of Redox Technologies in the Environment, ARTE’2009, September 14-15, 2009, Istanbul, Turkey.

·         Member of the International Organizing Committee, The 14th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Conference Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the International Organizing Committee, The 15th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Chair of Session VI: Water Treatment II, The 14th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Co-Chair (with Prof. Gianluca LiPuma) of Session I: UV/H2O2 and VUV/H2O2, The 15th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Co-Chair (with Prof. Madjid Mohseni) of Session II: UV/H2O2,UV Photocatalysis, Sonophotolysis, Photo-Fenton, and Electro-Fenton, The 15th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Co-Chair (with Prof. Nilsun H. Ince) of Session III: Sonolysis, Photocatalysis, Fenton, Electro-Fenton, and In-Situ Oxidation, The 15th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, October 5-8, 2009, The Conference Center, Niagara Falls, New York.

·         Symposium Organizer (co-Organizer: Nora Savage) and Session Chair, Nanotechnology: Enabling Sustainable Solutions for Potable Water, Division of Environmental Chemistry, 239th American Chemical Society National Meeting and Exposition, San Francisco, California, March 21-25, 2010.

·         Chair of Session, Symposium Nanotechnology and the Environment:  Emphasis on Green Nanotechnology, Division of Industrial and Engineering Chemistry, 239th American Chemical Society National Meeting and Exposition, San Francisco, California, March 21-25, 2010.

·         Member of the International Scientific Advisory Committee, Third International Conference on Environmental Toxicology, May 4-6, 2010, Limassol, Cyprus.

·         Member of the International Scientific Advisory Committee, The 6th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA 6), June 13-16, 2010, Prague, Czech Republic.

·         Member of the International Program Committee, The 6th International Conference on Sustainable Water Environment- Climate Change and Water Infrastructures, July 29-31, 2010, University of Delaware, Newark, Delaware.

·         Chair of Session 4.8. Separations, The 6th International Conference on Sustainable Water Environment-Climate Change and Water Infrastructures, July 29-31, 2010, University of Delaware, Newark, Delaware.

·         Member of the International Scientific Committee, The Eighth International IWA Symposium on Waste Management Problems in Agro-Industries- AGRO 2011, June 22-24, 2011, Cesme, Izmir, Turkey.

·         Conference Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the International Organizing Committee, The 16th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, November 15-18, 2010, San Diego California, U.S.A.

·         Member of the International Organizing Committee, The 15th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, November 15-18, 2010, San Diego California, U.S.A.

·         Organizer (with co-organizers: Wonyong Choi, Kelvin Gregory, Woojin Lee, Gregory Lowry, T. David Waite) of the Pacifichem Symposium: Redox Processes on Nanoparticles, Nanomaterials, and Nanostructured Systems in the Environment (Symposium # 272, presented on December 19 and 20; three oral sessions and one poster session), Pacifichem 2010, December 15-20, 2010, Honolulu, Hawaii, USA.

·         Session chair (with co-chair: Wonyong Choi), Oral Session 3 of the Pacifichem Symposium Redox Processes on Nanoparticles, Nanomaterials, and Nanostructured Systems in the Environment (Symposium # 272, oral session 3, presented on December 20, 7:45-11:05 am), Pacifichem 2010, December 15-20, 2010, Honolulu, Hawaii, USA.

·         Session Presider, Poster Session, Pacifichem Symposium Redox Processes on Nanoparticles, Nanomaterials, and Nanostructured Systems in the Environment (Symposium # 272, poster session, presented on December 19, 7:00-9:00 pm), Pacifichem 2010, December 15-20, 2010, Honolulu, Hawaii, USA.

·         Symposium Organizer (co-Organizers: W. Cooper, W. Arnold, S. Snyder), Occurrence, Detection, Removal, and Environmental Fate of Pharmaceutical and Personal Care Products in Wastewater, Groundwater, and Other Sources of Water Supply, Division of Environmental Chemistry, 241st American Chemical Society National Meeting and Exposition, Anaheim, California, March 27-31, 2011.

·         Session Chair (co-Chair: W. Cooper), Occurrence, Detection, Removal, and Environmental Fate of Pharmaceutical and Personal Care Products in Wastewater, Groundwater, and Other Sources of Water Supply (Organizers: W. Arnold, W. Cooper, D. Dionysiou, S. Snyder), Session: Biodegradation, Photolysis and Sorption of Pharmaceuticals, Division of Environmental Chemistry, 241st American Chemical Society National Meeting and Exposition, Anaheim, California, March 27-31, 2011.

·         Session co-Chair (Chair: W. Cooper), Occurrence, Detection, Removal, and Environmental Fate of Pharmaceutical and Personal Care Products in Wastewater, Groundwater, and Other Sources of Water Supply (Organizers: W. Arnold, W. Cooper, D. Dionysiou, S. Snyder), Division of Environmental Chemistry, Session: Advanced Oxidation Processes, 241st American Chemical Society National Meeting and Exposition, Anaheim, California, March 27-31, 2011.

·         Member of the International Program Committee, International Conference on Energy, Environment, Entrepreneurship, and Innovation (ICEEEI-11), May 27-29, 2011, Lanzarote, Canary Islands, Spain.

·         Conference Co-Chairman (Chair: Changgen Feng) The 2011 International Symposium on Environmental Science and Technology (ISEST), Dongguan, Guangdong Province, China, June 1-4, 2011.

·         Session Chair, Water Pollution and Water Quality Control (I), The 2011 International Symposium on Environmental Science and Technology (ISEST), Dongguan, Guangdong Province, China, June 1-4, 2011.

·         Member of the International Organizing Committee, The 8th Symposium on Waste Management Problems in Agro-Industries (Agro'2011), June 22-24, 2011, Çeşme, Turkey.

·         Member of the International Organizing Committee, The 3rd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, A. Mitraki, A. Odysseos, C. Politis), June 26-29, 2011, Crete, Greece.

·         Chair (with Co-chairs: Prof. Jorge Gardea-Torresdey, University of Texas at El-Paso, and Dr. Polycarpos Falaras, Demokritos Research Center, Greece) of the Symposium on Environmental Applications and Implications (June 27, 2011), The 3rd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, A. Mitraki, A. Odysseos, C. Politis), June 26-29, 2011, Crete, Greece.

·         Chair (with Co-chair: Prof. A. Christou) of the Session on Nano-multidisciplinary 2 (NM-2) (June 28, 2011), The 3rd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, A. Mitraki, A. Odysseos, C. Politis), June 26-29, 2011, Crete, Greece.

·         Chair of the Session on Environmental Applications and Implications, Cretan Workshop on Global Challenges & Opportunities for Nanotechnology (June 29, 2011), The 3rd International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (IC4N) (Conference Organizers: E. I. Meletis, A. Mitraki, A. Odysseos, C. Politis), June 26-29, 2011, Crete, Greece.

·         Chair (with Co-chair Helen Hsu-Kim, Duke University) of the Session on Nano-scale Issues in Environmental Engineering and Science, The Association of Environmental Engineering and Science Professors (AEESP) Education and Research Conference, July 10-12, 2011, Tampa, Florida.

·         Symposium co-Organizer (co-Organizers: Woojin Lee, Kelvin B. Gregory, Wonyong Choi, David Waite), Abiotic and Biotic Interactions at Nano-Scale Interfaces, 242nd American Chemical Society (ACS) National Meeting, August 28-September 01, 2011, Denver, Colorado.

·         Symposium Co-Organizer (Co-Organizers: Fernando L. Rosario-Ortiz, Karl Linden, Stephen P. Mezyk), Chemistry of Hydroxyl Radicals in Natural and Engineered Aqueous Systems, 242nd American Chemical Society (ACS) National Meeting, August 28-September 01, 2011, Denver, Colorado.

·         Session Co-Chair (Co-Chairs: Karl Linden and Fernando L. Rosario-Ortiz), Chemistry of Hydroxyl Radicals in Natural and Engineered Aqueous Systems (Organizers: Dionysios D. Dionysiou, Fernando L. Rosario-Ortiz, Karl Linden, and Stephen P. Mezyk), Session: Advanced (Oxidation Processes, 242nd American Chemical Society (ACS) National Meeting, August 28-September 01, 2011, Denver, Colorado.

·         Member of the International Scientific Advisory Board, The 3rd International Symposium on Environmental Management, SEM – Towards Sustainable Technologies (SEM2011), October 26 - 28, 2011, Zagreb, Croatia.

·         Chair (with Co-chair: Prof. Nenad Mikulic) of the session Water and Wastewater Management, The 3rd International Symposium on Environmental Management, SEM – Towards Sustainable Technologies (SEM2011), October 26 - 28, 2011, Zagreb, Croatia.

·         Conference Co-Chair (with Prof. Gianluca Li Puma, University of Nottingham) of the International Organizing Committee, The 17th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, November 7-10, 2011, San Diego California, U.S.A.

·         Chair of Session 12 – Electro-Oxidation and Electro-Fenton Processes, The 17th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, November 7-10, 2011, San Diego California, U.S.A.

·         Member of the International Organizing Committee, The 16th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, November 7-10, 2011, San Diego California, U.S.A.

·         Member of the International Scientific Advisory Committee, 1st International Conference on Advances in Environmental Chemistry (AEC), November 16-18, 2011, Aizawl, India.

·         Symposium Co-Organizer (co-Organizers: Susan Richardson, Michael J. Plewa, XingFang Li), Emerging Environmental Contaminants: Chemistry and Toxicology, Division of Environmental Chemistry, 243rd American Chemical Society (ACS) National Meeting, March 25-29, 2012, San Diego, California.

·         Symposium Co-Organizer (Co-Organizers: Gianluca Li Puma, John D. Fortner, Kai Loon Chen, Pedro J. Alvarez), Environmental Applications and Ecological Implications of Nanotubes, Nanowires, and Fullerenes, Division of Environmental Chemistry, 243rd American Chemical Society (ACS) National Meeting, March 25-29, 2012, San Diego, California.

·         Member of the International Scientific Committee, The 6th IWA Specialist Conference on Oxidation Technologies for Water and Wastewater Treatment (Advanced Oxidation Technologies, AOP6), May 7-9, 2012, Goslar, Germany.

·         Session Chair (Photocatalysis-1), The 6th IWA Specialist Conference on Oxidation Technologies for Water and Wastewater Treatment (Advanced Oxidation Technologies, AOP6), May 7-9, 2012, Goslar, Germany.

·         Member of the International Scientific Advisory Committee, International Conference on Recycling and Reuse” (R&R, 2012), June 4-6, 2012, Istanbul, Turkey.

·         Member of the International Scientific Advisory Committee, The 7th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA 7), June 17-20, 2012, Porto, Portugal.

·         Session Co-chair (with Dr. Sixto Malato), General Environmental Applications of Solar Chemistry and Photocatalysis, The 7th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA 7), June 17-20, 2012, Porto, Portugal.

·         Member of the International Scientific Advisory Committee, ANQUE, International Congress of Chemical Engineering, June 24-27, 2012, Seville, Spain.

·         Panel Discussion Co-leader (with Dr. Christa McArdell, EAWAG, Dübendorf, Switzerland), Session 3: Uptake of Contaminants, Treatment Technologies during the Workshop “Wastewater Reuse Applications and Contaminants of Emerging Concern”, September 13-14, 2012, Limassol, Cyprus.

·         Member of the International Scientific Advisory Committee, The Second International Conference on Advanced Oxidation Processes (AOP-2012), October 5-8, 2012, Kottayam, Kerala, India.

·         Session chair of Environmental Keynote Lectures IV and VI, The 11th International and 23rd National Chemistry Conference, National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan, October 15-17, 2012.

·         Conference Co-Chair (with Gianluca Li Puma) The 18th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-18), November 11-15, 2012, Jacksonville, Florida.

·         Session Co-Chair (with Santiago Esplugas and Claudio Zaror), Session X: Contaminant Removal with Combined Oxidation Processes-1, The 18th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-18), November 11-15, 2012, Jacksonville, Florida.

·         Session Chair, Session XIII: Contaminant Removal with Combined Oxidation Processes-2, The 18th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-18), November 11-15, 2012, Jacksonville, Florida.

·         Member of the International Organizing Committee, The 17th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-17), November 11-15, 2012, Jacksonville, Florida, USA.

·         Session Chair, Session X: Photocatalysis in Water Treatment, The 17th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-17), November 11-15, 2012, Jacksonville, Florida, USA.

·         Member of the International Scientific Advisory Committee, The International Conference on Renewable Energy (ICRE 2014), April 1-3, 2013, Damascus, Syrian Arab Republic.

·         Symposium Co-Organizer (Co-Organizers: Gianluca Li Puma, Silvio Canonica, Kevin O’Shea), Chemistry and Applications of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Division of Environmental Chemistry, The 245th American Chemical Society (ACS) National Meeting, April 7-11, 2013, New Orleans, Louisiana.

·         Session Co-Chair (Co-Chairs: William Cooper and Gianluca Li Puma), Chemistry and Applications of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Session on Oxidative Transformations and the Removal of Contaminants of Emerging Concern,  Division of Environmental Chemistry, The 245th American Chemical Society (ACS) National Meeting, April 7-11, 2013, New Orleans, Louisiana.

·         Session Co-Chair (Co-Chair: Valerie Hequet), Chemistry and Applications of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Session on Mechanisms of Molecular Free Radicals Attack on Emerging Contaminants and Viruses,  Division of Environmental Chemistry, The 245th American Chemical Society (ACS) National Meeting, April 7-11, 2013, New Orleans, Louisiana.

·         Session Co-Chair (Co-Chair: Elio Giamello), Chemistry and Applications of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Session on Advanced on Photocatalytic Materials for Contaminant Oxidation, Division of Environmental Chemistry, The 245th American Chemical Society (ACS) National Meeting, April 7-11, 2013, New Orleans, Louisiana.

·         Session Co-Chair (Co-Chair: Gianluca Li Puma), Chemistry and Applications of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Session on Fenton, Photo-Fenton, and UV-H2O2 Advanced Oxidation, Division of Environmental Chemistry, The 245th American Chemical Society (ACS) National Meeting, April 7-11, 2013, New Orleans, Louisiana.

·         Conference Co-Organizer (with Bingcai Pan and X. S. (George) Zhao) IWA Symposium on Environmental Nanotechnology 2013, April 24-27, Nanjing, China.

·         Session Chair, Plenary Lectures 3 and 4, IWA Symposium on Environmental Nanotechnology 2013, April 25, Nanjing, China.

·         Conference Co-Chairman (with Xie Quan) The 2013 International Symposium on Environmental Science and Technology (ISEST), June 4-7, Dalian, Liaoning Province, China.

·         Co-Chair (with Prof. JiaQian Jiang) of Session 2 of Invited Plenary Presentations, The 2013 International Symposium on Environmental Science and Technology (ISEST), June 4-7, Dalian, Liaoning Province, China.

·         Co-Chair (with Prof. Virender K. Sharma) of Session A1 of the Special Session Honoring Professor Jincai Zhao, Institute of Chemistry, Chinese Academy of Sciences,  The 2013 Symposium on Environmental Science and Technology (ISEST), June 4-7, Dalian, Liaoning Province, China.

·         Member of the International Scientific Advisory Committee, The 9th Asian Pacific Conference on Sustainable Energy & Environmental Technologies (APCSEET2013), July 5-8, 2013, Narita, Japan.

·         Organizer (with Antonio Quesada and Triantafyllos Kaloudis), ICCE 2013 Satellite Symposium on Cyanobacteria-Cyanotoxins in Aquatic Environments, June 25, Barcelona, Spain.

·         Chair of Session, “Prevention and Treatment”, ICCE 2013 Satellite Symposium on Cyanobacteria-Cyanotoxins in Aquatic Environments, June 25, Barcelona, Spain.

·         Co-Chair (with Santiago Esplugas) of the Session “Transformation and Fate of Pollutants” (B-OTF1-5; B-KN10, June 27, 2:00-4:20 pm, The 14th EuCheMS International Conference on Chemistry and the Environment (ICCE 2013), June 25-28, Barcelona, Spain.

·         Conference Co-Chair (with Gianluca Li Puma) The 19th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-19), November 17-21, 2013, San Diego, California.

·         Session Chair, Session 14: Advanced Oxidation Technologies: Emerging Catalysts - II, The 19th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-19), November 17-21, 2013, San Diego, California.

·         Member of the International Organizing Committee, The 18th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-18), November 17-21, 2013, San Diego, California.

·         Member of the International Organizing Committee, International Conference on Advanced Functional Materials (ICAFM 2014), February 19-21, 2014, Trivandrum, Kerala, India.

·         Co-Chair (with Anastasia Hiskia) of Session 1 of the Workshop on Cyanotoxins in Fresh Waters – Advances in Analysis, Occurrence and Treatment, May 5, NCSR Demokritos, Athens, Greece.

·         Symposium Co-Organizer (with J. Martin, J. Benskin, and B. Mitch) and Co-Chair (with P. Helm) of Sessions 3 and 4, Symposium on Chemicals of Emerging Concern, The 97th Canadian Chemistry Conference and Exhibition, June 1-5, 2014, Vancouver, British Columbia, Canada.

·         Member of the International Advisory Board, Symposium FE on “Advances in Photocatalytic Materials for Energy and Environmental Sustainability,” 13th International Ceramics Congress and the 6th Forum on New Materials, June 8-20, 2014 (CIMTEC 2014), Montecatini Terme, Tuscany, Italy.

·         Centennial Symposium Co-Organizer (with Souhail Al-Abed), Environmental Chemistry: 100 Years of Scientific Contribution for a Safer and Sustainable Environment, Division of Environmental Chemistry, 248th American Chemical Society (ACS) National Meeting and Exposition, August 10-14, 2014, San Francisco, California.

·         Centennial Symposium Co-Organizer (with Jillian L. Goldfarb, Rachel A. Brennan, Elizabeth R. Carraway, Isabel C. Escobar, April Z. Gu, Jane Hill, Heileen Hsu-Kim, Cindy M. Lee, Susan Richardson, and Staci L. Massey Simonich), Women in Environmental Science and Engineering, Division of Environmental Chemistry, 248th American Chemical Society (ACS) National Meeting and Exposition, August 10-14, 2014, San Francisco, California.

·         Symposium Co-Organizer (with James J. Pagano), Great Lakes Restoration Initiative: An Environmental Chemistry Challenge, Division of Environmental Chemistry, 248th American Chemical Society (ACS) National Meeting and Exposition, August 10-14, 2014, San Francisco, California.

·         Symposium Co-Organizer and Session Co-Chair (with Gianluca Li Puma, Silvio Canonica, Kevin O'Shea, Daisuke Minakata), New Advances in the Chemistry and Application of Advanced Oxidation Processes for Removal of Contaminants of Emerging Concern, Division of Environmental Chemistry, 248th American Chemical Society (ACS) National Meeting and Exposition, August 10-14, 2014, San Francisco, California.

·         Symposium Co-Organizer (with Satinder Ahuja, Kiril Hristovski, Bommanna G. Loganathan, Hessy L. Taft, Jailson B. de Andrade, and Adrian Parr), Water Challenges and Solutions on the Global Scale, Division of Environmental Chemistry, 248th American Chemical Society (ACS) National Meeting and Exposition, August 10-14, 2014, San Francisco, California.

·         Symposium Co-Organizer (with Walter Giger and Urs von Gunten), Advanced Oxidation Processes in Water and Wastewater Treatment, 5th EuCheMS Chemistry Congress, August 31-September 4, 2014, Istanbul Turkey.

·         Session Co-Chair (with Idil Arslan-Alaton), Symposium Advanced Oxidation Processes in Water and Wastewater Treatment, 5th EuCheMS Chemistry Congress, August 31-September 4, 2014, Istanbul Turkey.

·         Member of the International Advisory Committee, International Conference on Emerging Environmental & Advanced Oxidation Technologies for Energy, Environment and Sustainability (EEAOTEES-2014), September 29-30, 2014, Anna University, Chennai, India.

·         Session Co-Chair (with Nora Savage and John Fortner) Environmental Nanotechnology Applications 1 and 2, The Third Sustainable Nanotechnology Organization (SNO) Conference, November 2-4, 2014, Boston, Massachusetts, USA.

·         Session Co-Chair, Session B, Industrial and Environmental Applications of Nanomaterials, NANOCON® 2014-6th International Conference, November 5-7, Brno, Czech Republic.

·         Conference Co-Chair (with Hussain Al-Ekabi, Lev N. Krasnoperov, and Kevin O'Shea), The 20th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-20), November 17-20, 2014, San Diego, California.

·         Member of the International Organizing Committee, The 19th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-19), November 17-20, 2014, San Diego, California.

·         Member of the Conference Committee, 3rd IWA Water Research Conference, January 11-14, 2015, Shenzhen, China.

·         Session Chair, Parallel Session 5, New Materials for Water and Wastewater Treatment Operations, 3rd IWA Water Research Conference, January 11-14, 2015, Shenzhen, China.

·         Session Co-Chair (with Prof. Weimin Wu) Parallel Session A, January 17, First International Conference on All Material Fluxes in River Eco-Systems, Peking University, January 15-18, 2015, Beijing, China.

·         Member of the International Scientific Advisory Committee, International Conference on Futuristic Materials and Emerging Trends (ICFM-2015), February 5-7, 2015, Nagpur, India.

·         Session Chair, Session on Wastewater Treatment (AOPs), The 7th European Meeting on Chemical Industry and Environment (EMChIE2015), June 10-12, 2015, Tarragona, Spain.

·         Symposium Co-Organizer (with Gianluca Li Puma, Kevin E. O’Shea, Daisuke Minakata, and Regina de Fatima Peralta Muniz Moriera), New Challenges in Water Quality, Treatment, Reuse and Sustainability: Chemistry and Application of Advanced Oxidation Processes for Removal of Contaminants of Concern and Transformation Products, Division of Environmental Chemistry, the 250th American Chemical Society (ACS) National Meeting and Exposition, August 16-20, 2015, Boston, Massachusetts.

·         Session Co-Chair (with Kevin E. O’Shea), New Challenges in Water Quality, Treatment, Reuse and Sustainability: Chemistry and Application of Advanced Oxidation Processes for Removal of Contaminants of Concern and Transformation Products - Processes, Division of Environmental Chemistry, the 250th American Chemical Society (ACS) National Meeting and Exposition, August 16-20, 2015, Boston, Massachusetts.

·         Symposium Co-Organizer (with James. J. Pagano), Status and Trends of Biological and Persistent Organic Chemicals in the Great Lakes, Division of Environmental Chemistry, the 250th American Chemical Society (ACS) National Meeting and Exposition, August 16-20, 2015, Boston, Massachusetts.

·         Symposium Co-Organizer (with Bryan Brooks, George Cobb, Pamela Rice, Elin Ulrich), Global Research Needs: Identifying and Prioritizing Efforts to Sustain Environmental Quality, Division of Agrochemicals, the 250th American Chemical Society (ACS) National Meeting and Exposition, August 16-20, 2015, Boston, Massachusetts.

·         Member of the Scientific Committee, the 15th EuCheMS International Conference on Chemistry and the Environment (ICEE-2015), September 20-24, Leipzig, Germany.

·         Session Chair, Water Quality, Wastewater Treatment and Reuse, Drinking Water 2, the 15th EuCheMS International Conference on Chemistry and the Environment (ICEE-2015), September 20-24, Leipzig, Germany.

·         Member of the Scientific Committee, The 4th European Conference on Environmental Applications of Advanced Oxidation Processes (EAAOP4), October 21-24, 2015, Athens, Greece.

·         Conference Chair (Co-Chair: Prof. JinCai Zhao, Executive Chair: Prof. Hong Liu), The 2015 International Symposium on Environmental Science and Technology (ISEST 2015), Nov. 1-3, 2015, Chongqing, China.

·         Session Chair (with Prof. Andy Cundy), Invited Plenary Presentations-Session 3, The 2015 International Symposium on Environmental Science and Technology (ISEST 2015), Nov. 1-3, 2015, Chongqing, China.

·         Member of the International Scientific Advisory Committee, The 8th Congress on Environmental Application of Advanced Oxidation Processes (VIII EPOA) and the 2nd Iberoamerican Congress on Advanced Oxidation Processes (II CIPOA), November 3-6, 2015, Belo Horizonte, Brazil.

·         Session Chair, 5C Environmental/Biological Systems and Poster Session, Fourth Annual Sustainable Nanotechnology Organization Conference, November 8-10, 2015, Portland, Oregon. 

·         Conference Chair, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Chair, Session 1, Advanced Oxidation Processes, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair (with Dr. Jack Sheldon), Session 2, In-Situ Chemical Oxidation (ISCO) and In-Situ Chemical Reduction (ISCR), The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair (with Prof. Christian Schöneich), Session 4, In-Situ Chemical Oxidation (ISCO) and In-Situ Chemical Reduction (ISCR), The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Chair, Session 5, Photocatalytic Air Treatment, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair (with Prof. Santiago Esplugas), Session 6, Photo-Fenton and Fenton-like Reactions, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair, Session 7, Non-Thermal Plasma/Liquid Phase Treatment, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair, Session 11, Plasma Catalysis, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Session Co-Chair, Session 12, Interesting Approaches in Water and Air Treatment, The 21st International Conference on Advanced Oxidation Technologies for the Treatment of Water, Air, and Soil, November 16-19, 2015, San Diego, California.

·         Symposium Organizer and Session Chair of sessions I and IV (Co-Organizers: J. Gardea-Torresday, W. Lee, X. Zhao, B. Pan, M. Litter,), Nanointerfaces and their Role in Environmental Systems and Processes, Area 6-Agrochemistry, Environmental and Geochemistry, The International Chemical Congress of Pacific Basin Societies: Pacifichem 2015, December 15-20, 2015, Honolulu, Hawaii, USA.

·         Symposium Co-Organizer (Co-Organizer: S. Al-Abed; co-Organizers: H. Choi, A. Bezbaruah, J. Gardea-Torresday, W. Choi, M. Litter, T. Lim, B. Pan), Environmental Monitoring and Remediation, Area 8-Materials & Nanoscience, The International Chemical Congress of Pacific Basin Societies: Pacifichem 2015, December 15-20, 2015, Honolulu, Hawaii, USA.

·         Member of the International Scientific Advisory Committee, Third International Conference on Recycling and Reuse, 28-30 September 28-30, 2016, Istanbul, Turkey.