Photolytic degradation of all chlorophenols with polyoxometallates and H2O2

Antonaraki, S; Androulaki, E; Dimotikali, D; Hiskia, A; Papaconstantinou, E

dc.contributor.author	Antonaraki, S	en
dc.contributor.author	Androulaki, E	en
dc.contributor.author	Dimotikali, D	en
dc.contributor.author	Hiskia, A	en
dc.contributor.author	Papaconstantinou, E	en
dc.date.accessioned	2014-03-01T01:18:12Z
dc.date.available	2014-03-01T01:18:12Z
dc.date.issued	2002	en
dc.identifier.issn	10106030	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14864
dc.subject	Chlorophenols	en
dc.subject	Hydrogen peroxide	en
dc.subject	OH radicals	en
dc.subject	Photocatalysis	en
dc.subject	Photodegradation	en
dc.subject	Polyoxometallates	en
dc.subject.other	3 chlorophenol	en
dc.subject.other	3,4 dichlorophenol	en
dc.subject.other	benzoquinone derivative	en
dc.subject.other	chlorine	en
dc.subject.other	chlorophenol	en
dc.subject.other	hydrogen peroxide	en
dc.subject.other	hydroquinone derivative	en
dc.subject.other	hydroxyl radical	en
dc.subject.other	pentachlorophenol	en
dc.subject.other	titanium dioxide	en
dc.subject.other	trichlorobenzene	en
dc.subject.other	trichlorophenol derivative	en
dc.subject.other	article	en
dc.subject.other	catalyst	en
dc.subject.other	chemical structure	en
dc.subject.other	chlorination	en
dc.subject.other	controlled study	en
dc.subject.other	degradation kinetics	en
dc.subject.other	photodegradation	en
dc.subject.other	ultraviolet radiation	en
dc.subject.other	water management	en
dc.subject.other	water pollutant	en
dc.title	Photolytic degradation of all chlorophenols with polyoxometallates and H2O2	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S1010-6030(02)00042-4	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S1010-6030(02)00042-4	en
heal.publicationDate	2002	en
heal.abstract	The photolytic degradation of all chlorophenols (CPs) under UV and near VIS light, in the presence of H2O2 (0.1 M) or polyoxometallate (POM) photocatalyst PW12O403- (7 × 10-4 M) in aqueous solutions has been studied. In both cases, the initial rates of photodegradation of all substrates are comparable, following first-order kinetics. In both cases the photodecomposition of substrates correlates with the position and the number of chlorine atoms in the ring. The slowest is the fully chlorinated pentachlorophenol (PCP). It has been found that chlorine substituents in meta positions accelerate the photodecomposition process. Thus, in some cases the position dominates the number of C1 atoms, for instance 3,4,5-trichlorophenol > 3,4-dichlorophenol ≥ 3-chlorophenol. Similar results for a few CPs have been reported with TiO2 and H2O2. A target compound, 2,4,6-trichlorophenol, was used in order to compare the degradation mechanisms, by both H2O2 and PW12O403-. The intermediates detected were 3,5-dichlorocatechol, 2,6-dichlorobenzoquinone, dihydroxytrichlorobenzene, trihydroxydichlorobenzene and dichlorohydroquinone. The same intermediates have been reported with TiO2. The similarity in the photodecomposition process of all CPs by three different methods, i.e. PW12O403-, TiO2 or H2O2 further supports the notion that all three act, mainly, through the generation of OH radicals. © 2002 Elsevier Science B.V. All rights reserved.	en
heal.journalName	Journal of Photochemistry and Photobiology A: Chemistry	en
dc.identifier.doi	10.1016/S1010-6030(02)00042-4	en
dc.identifier.volume	148	en
dc.identifier.issue	1-3	en
dc.identifier.spage	191	en
dc.identifier.epage	197	en