Photocatalytic Mineralization and Detoxification of Pentachlorophenol by UV- and Visible Light-TiO2 Systems
Invited conference paper presented and published in conference proceedings


摘要Optimal physico-chemical conditions for the photocatalytic degradation of pentachlorophenol (PCP) by UV-TiO2 and visible light (VL)-TiO2 systems were determined. Under the optimized conditions, More than 90% of PCP was removed within 60 and 120 min by the UV-TiO2 system and VL-TiO2 system, respectively. In addition, the removal of total organic carbon content reached more than 85% and 95% after 60 min photocatalytic treatment by the UV-TiO2 system and VL-TiO2 system, respectively. The degradation pathways in two different systems were determined by analysis of their degradation products and intermediates using gas chromatography/mass spectrometry (GC/MS). The major photocatalytic degradation intermediates tetrachlorohydroquinone (TeHQ) and tetrachlorobenzoquinone (TeBQ) were detected in both system.

Although photocatalysis is a powerful tool to treat PCP-contaminated water, it may generate toxic intermediate(s)/product(s) during the photocatalytic degradation. For the Microtox test and amphipod survival test, the photocatalytic treatment shows a reduction on the toxicity of PCP. The toxicity of PCP was non-detectable for the Microtox test after 60 min treatment in UV-TiO2 system, while a reduced toxicity was found for amphipod survival test. However, the toxicity reduction of PCP by the photocatalytic treatment with VL-TiO2 was not satisfactory. The potential application of these systems will be discussed.
著者Wai Lan FONG, Dehua XIA, Po Keung WONG
會議名稱International Conference on Environmental Pollution and Human Health
關鍵詞Photocatalysis, Pentachlorophenol, Visible light, UV, Detoxification

上次更新時間 2018-24-05 於 15:09