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Titolo:
Photocatalytic degradation of 2-phenylphenol on TiO2 and ZnO in aqueous suspensions
Autore:
Khodja, AA; Sehili, T; Pilichowski, JF; Boule, P;
Indirizzi:
Univ Constantine, Lab Photochim & Environm, Unite Rech Chim, Constantine 25000, Algeria Univ Constantine Constantine Algeria 25000 m, Constantine 25000, Algeria Univ Blaise Pascal, Lab Photochim Mol & Macromol, UMR 6505, F-63177 Aubiere, France Univ Blaise Pascal Aubiere France F-63177 6505, F-63177 Aubiere, France
Titolo Testata:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
fascicolo: 2-3, volume: 141, anno: 2001,
pagine: 231 - 239
SICI:
1010-6030(20010702)141:2-3<231:PDO2OT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
TITANIUM-DIOXIDE; CHLOROAROMATIC DERIVATIVES; HYDROGEN-PEROXIDE; ZINC-OXIDE; OXIDATION; KINETICS; PHENOL; PHOTOCYCLISATION; PHOTOOXIDATION; TRANSFORMATION;
Keywords:
2-phenylphenol; photodegradation; positive holes h(+);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Khodja, AA Univ Constantine, Lab Photochim & Environm, Unite Rech Chim, Route de Ain El Bey, Constantine 25000, Algeria Univ Constantine Route de AinEl Bey Constantine Algeria 25000
Citazione:
A.A. Khodja et al., "Photocatalytic degradation of 2-phenylphenol on TiO2 and ZnO in aqueous suspensions", J PHOTOCH A, 141(2-3), 2001, pp. 231-239

Abstract

The degradation of 2-phenylphenol (OPP), commonly used as fungicide, can be photocatalysed by TiO2 and ZnO. The latter is a little more efficient butcannot be used in acidic solution. In both cases, the main identified photoproducts are hydroquinone (HQ), p-benzoquinone (BQ), phenylhydroquinone (PHQ), phenylbenzoquinone (PBQ), 2,2 '- and 2,3-dihydroxybiphenyls (2,2 '- and 2,3-BPh(OH)(2)). The observed minor formation of 2-hydroxydibenzofuran isdue to the photocyclisation of PBQ. The influence of various parameters is considered. The phototransformationof OPP is slightly favoured by increasing pH. It is enhanced by the addition of small amounts of H2O2, but it is inhibited by high concentrations of chloride, sulphate or nitrate. From the inhibiting effect of alcohols, it is deduced that the main degradation pathway involves hydroxyl radicals, buta direct oxidation by positive holes hi is probably not negligible. The observed slow photodegradation of ZnO in unbuffered solution is attributed toan electrochemical process. A mechanism is proposed for the photocatalytictransformation of OPP. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:38:08