Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies
The photocatalytic degradation of metoxuron [3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea] in aqueous suspensions of TiO2 was investigated. Several intermediate photoproducts were identified using NMR and MS techniques. Oxidation or removal of the methyl of terminal nitrogen and ring hydroxylation...
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2002-01-01
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Series: | International Journal of Photoenergy |
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doaj-a54b420f3bd44500bcbd0fb83e5891502020-11-24T22:25:50ZengHindawi LimitedInternational Journal of Photoenergy1110-662X2002-01-014414715110.1155/S1110662X0200017XPhotocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studiesAmina Amine Khodja0Bernadette Lavedrine1Claire Richard2Tahar Sehili3Laboratoire des Sciences et Technologie de l'Environnement. Université Mentouri, Route de Ain El Bey, Constantine 25000, AlgeriaLaboratoire de Photochimie Moléculaire et Macromoléculaire UMR CNRS-Université Blaise Pascal no. 6505, Aubiére Cedex F-63177, FranceLaboratoire de Photochimie Moléculaire et Macromoléculaire UMR CNRS-Université Blaise Pascal no. 6505, Aubiére Cedex F-63177, FranceLaboratoire des Sciences et Technologie de l'Environnement. Université Mentouri, Route de Ain El Bey, Constantine 25000, AlgeriaThe photocatalytic degradation of metoxuron [3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea] in aqueous suspensions of TiO2 was investigated. Several intermediate photoproducts were identified using NMR and MS techniques. Oxidation or removal of the methyl of terminal nitrogen and ring hydroxylation were found to occur. 2-Propanol was shown to decrease the rate of photocatalytic degradation, inhibiting partly ring hydroxylation and completely reactions on terminal nitrogen. In contrast, basification of the suspensions accelerated the degradation significantly. Degussa P25 TiO2 was found to exhibit a higher photocatalytic activity than Millennium TiO2 in spite of a generally smaller specific surface area. Within the Millennium TiO2 series, the photocatalytic efficiency increased with the specific surface area.http://dx.doi.org/10.1155/S1110662X0200017X |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Amina Amine Khodja Bernadette Lavedrine Claire Richard Tahar Sehili |
spellingShingle |
Amina Amine Khodja Bernadette Lavedrine Claire Richard Tahar Sehili Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies International Journal of Photoenergy |
author_facet |
Amina Amine Khodja Bernadette Lavedrine Claire Richard Tahar Sehili |
author_sort |
Amina Amine Khodja |
title |
Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies |
title_short |
Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies |
title_full |
Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies |
title_fullStr |
Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies |
title_full_unstemmed |
Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies |
title_sort |
photocatalytic degradation of metoxuron in aqueous suspensions of tio2. analytical and kinetic studies |
publisher |
Hindawi Limited |
series |
International Journal of Photoenergy |
issn |
1110-662X |
publishDate |
2002-01-01 |
description |
The photocatalytic degradation of metoxuron [3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea]
in aqueous suspensions of TiO2 was investigated. Several intermediate photoproducts were identified using
NMR and MS techniques. Oxidation or removal of the methyl of terminal nitrogen and ring hydroxylation were
found to occur. 2-Propanol was shown to decrease the rate of photocatalytic degradation, inhibiting partly
ring hydroxylation and completely reactions on terminal nitrogen. In contrast, basification of the suspensions
accelerated the degradation significantly. Degussa P25 TiO2 was found to exhibit a higher photocatalytic
activity than Millennium TiO2 in spite of a generally smaller specific surface area. Within the Millennium
TiO2 series, the photocatalytic efficiency increased with the specific surface area. |
url |
http://dx.doi.org/10.1155/S1110662X0200017X |
work_keys_str_mv |
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1725756046940569600 |