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On the photooxidative behavior of TiO2 and PW12O403−: OH radicals versus holes

Paper ID Volume ID Publish Year Pages File Format Full-Text
48923 46528 2006 8 PDF Available
Title
On the photooxidative behavior of TiO2 and PW12O403−: OH radicals versus holes
Abstract

Parallel experiments under similar conditions, using various substrates (atrazine, fenitrothion, 4-chlorophenol and 2,4-D) and OH radical scavengers (Br−, isopropyl alcohol, tertiary butyl alcohol and acetone), have shown that the photooxidizing mode of PW12O403− and TiO2, i.e., OH radicals and/or holes (h+), depends on the nature of substrate and the mode of investigation. This provides an explanation for the controversial results reported in the literature. Atrazine shows that both PW12O403− and TiO2 operate, mainly, via OH radicals and to a lesser extent with holes (h+), whereas, fenitrothion suggests that both systems operate almost exclusively, via OH radicals. Differences in the action of the catalysts are encountered in the photodegradation of 4-chlorophenol (4-ClPh) and 2,4-dichlorophenoxyacetic acid (2,4-D). PW12O403− appears to operate essentially via OH radicals, whereas, h+ appear to be the major oxidant with TiO2. Overall, though, the action of OH radicals relative to h+ appears to be more pronounced with PW12O403− than TiO2.

Keywords
Photocatalysis; Polyoxometallates; TiO2; OH radicals; Holes
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On the photooxidative behavior of TiO2 and PW12O403−: OH radicals versus holes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 68, Issues 3–4, 7 November 2006, Pages 139–146
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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