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

Kormali, P; Triantis, T; Dimotikali, D; Hiskia, A; Papaconstantinou, E

dc.contributor.author	Kormali, P	en
dc.contributor.author	Triantis, T	en
dc.contributor.author	Dimotikali, D	en
dc.contributor.author	Hiskia, A	en
dc.contributor.author	Papaconstantinou, E	en
dc.date.accessioned	2014-03-01T01:24:48Z
dc.date.available	2014-03-01T01:24:48Z
dc.date.issued	2006	en
dc.identifier.issn	0926-3373	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17439
dc.subject	Holes	en
dc.subject	OH radicals	en
dc.subject	Photocatalysis	en
dc.subject	Polyoxometallates	en
dc.subject	TiO2	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	OH radical scavengers	en
dc.subject.other	Polyoxometallates	en
dc.subject.other	Catalysts	en
dc.subject.other	Halogen compounds	en
dc.subject.other	Hole traps	en
dc.subject.other	Photocatalysis	en
dc.subject.other	Photooxidation	en
dc.subject.other	Substrates	en
dc.subject.other	Titanium dioxide	en
dc.title	On the photooxidative behavior of TiO2 and PW12O403-: OH radicals versus holes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.apcatb.2006.07.024	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.apcatb.2006.07.024	en
heal.language	English	en
heal.publicationDate	2006	en
heal.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. (c) 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Applied Catalysis B: Environmental	en
dc.identifier.doi	10.1016/j.apcatb.2006.07.024	en
dc.identifier.isi	ISI:000241707700007	en
dc.identifier.volume	68	en
dc.identifier.issue	3-4	en
dc.identifier.spage	139	en
dc.identifier.epage	146	en