11月11日（周五）上午10：00王保强教授2016年学术报告之三十五“Photocatalytic Degradation and Detoxification of Pentachlorophenol”
Photocatalytic Degradation and Detoxification of Pentachlorophenol
报告题目：Photocatalytic Degradation and Detoxification of Pentachlorophenol
报告 人： 王保强 教授
香港中文大学
时 间：2016年11月11日 （周五）上午10：00-11：00
地 点：中山大学东校园环境大楼A104
主 持：贾晓珊 教授
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报告人简介：
Dr. Po Keung Wong is professor in school of life sciences of The Chinese University of Hong Kong. He obtained a B.Sc. and M.Sc. from The Chinese University of Hong Kong, and a Ph.D. from University of California at Davis. His research interests include photocatalytic treatment for environmental / water Purification, environmental technology, and environmental microbiology / biotechnology. He has published many research papers in influential journals, including Environmental Science & Technology, Water Research, Applied and Environmental Microbiology, and Applied Catalysis B: Environmental etc.
报告简介：
The optimal physico-chemical conditions of photocatalytic degradation of PCP were determined. For the UV irradiated photocatalytic system (UV-PC), the operating conditions were optimized at 200 mg/L of TiO2, 6.7 mM of H2O2, 17 mW/cm2 of light intensity and pH at 10. For the visible light (VL) irradiated photocatalytic system (VL-PC), the operating conditions were optimized at 500 mg/L of TiO2, 4 mM of H2O2, 1.04 mW/cm2 of light intensity and pH at 6. After 60 min of UV-PC and VL-PC, the removal of total organic carbon (TOC) reached 95 and 80%,respectively.
The degradation pathways of UV-PC and VL-PC were determined by analysis of their degradation products and intermediates by gas chromatography/mass spectrometry (GC/MS). Their major intermediates were tetrachlorohydroquinone (TeHQ) and tetrachlorobenzoquinone (TeBQ). For the UV-PC, there was no detectable intermediates found after 60 min irradiation respectively. However, for the VL-PC, it still had small amount of intermediates remained.
Although photocatalysis is a powerful treatment of contaminated water, it may generate toxic intermediates during the degradation and contribute part of toxicity in the solution. For the Microtoxò test and amphipod survival test, UV-PC and VL-PC show a reduction on the toxicity of PCP. Based on the results of the study, the toxicity of PCP was non-detectable for Microtoxò test after 60 minof UV-PCO respectively.