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International Journal of Photoenergy
Volume 4, Issue 4, Pages 147-151
http://dx.doi.org/10.1155/S1110662X0200017X

Photocatalytic degradation of metoxuron in aqueous suspensions of TiO2. Analytical and kinetic studies

1Laboratoire des Sciences et Technologie de l'Environnement. Université Mentouri, Route de Ain El Bey, Constantine 25000, Algeria
2Laboratoire de Photochimie Moléculaire et Macromoléculaire UMR CNRS-Université Blaise Pascal no. 6505, Aubiére Cedex F-63177, France

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.