Speaker：Dionysios D. Dionysiou, University of Cincinnati, Cincinnati, Ohio, USA
Location：Moonlight hall,Overseas Exchange Center
Mechanistic transformation pathways of treatment of cyanotoxins and other contaminants of emerging concern in water using AOPs will be overviewed. Emphasis will be given on UV and Solar-based Advanced Oxidation Processes such as TiO2-based photocatalysis (UV and visible) (i.e., a heterogeneous AOP) and UV/H2O2 process (i.e., a homogeneous AOP). Details will be presented on the degradation of cyanotoxins and other selected contaminants. Most emphasis will be placed on the oxidative pathways for the degradation of microcystin-LR and cylindrospermopsin. Transformation kinetic rates and reaction intermediates formed by OH radical attack and other reactive oxygen species on specific sites of the target contaminants will be presented and the detailed reaction pathways will be discussed. Discussion will also be provided when oxidation takes place by other radicals such as sulfate radicals and superoxide anion radicals under certain modifications of the processes described above. The role of water quality parameters such as natural organic matter, alkalinity and pH will be discussed, considering also the chemistry of the target contaminants and, in the case of heterogeneous AOPs, the role of the catalyst nano-interface.
Dr. Dionysios (Dion) D. Dionysiou is currently a Professor of Environmental Engineering and Science Program at the University of Cincinnati. He teaches courses and performs research in the areas of drinking water quality and treatment, advanced unit operations for water treatment, advanced oxidation technologies and nanotechnologies, and physical-chemical processes for water quality control. He has received funding from NSF, US EPA, NASA, NOAA/CICEET, USGS, USDA, and DuPont.
Prof. Dionysiou is currently editor of several journals, such as Chemical Engineering Journal, Journal of Advanced Oxidation Technologies, and Journal of Environmental Engineering (ASCE) et al.. He is the author or co-author of over 200 refereed journal publications, over 90 conference proceedings, 17 book chapter publications, 17 editorials, and more than 450 presentations. His work received over 7,000 citations.