Photocatalytic degradation of 2-phenylphenol on TiO2 and ZnO in aqueous suspensions
Identifieur interne : 000272 ( France/Analysis ); précédent : 000271; suivant : 000273Photocatalytic degradation of 2-phenylphenol on TiO2 and ZnO in aqueous suspensions
Auteurs : Amina Amine Khodja [Algérie] ; Tahar Sehili [Algérie] ; Jean-François Pilichowski [France] ; Pierre Boule [France]Source :
- Journal of Photochemistry & Photobiology, A: Chemistry [ 1010-6030 ] ; 2001.
English descriptors
- KwdEn :
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 but cannot 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 is due to the photocyclisation of PBQ. The influence of various parameters is considered. The phototransformation of 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, but a direct oxidation by positive holes h+ is probably not negligible. The observed slow photodegradation of ZnO in unbuffered solution is attributed to an electrochemical process. A mechanism is proposed for the photocatalytic transformation of OPP.
Url:
DOI: 10.1016/S1010-6030(01)00423-3
Affiliations:
- Algérie, France
- Auvergne (région administrative), Auvergne-Rhône-Alpes
- Aubière
- Université Blaise-Pascal
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ISTEX:C89AF1A45290BCF35EC6DA62ED74A3DABDF66041Le document en format XML
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type="ISSN">1010-6030</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>2-Phenylphenol</term><term>Photodegradation</term><term>Positive holes h+</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The degradation of 2-phenylphenol (OPP), commonly used as fungicide, can be photocatalysed by TiO2 and ZnO. 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