Photocatalytic degradation of metoxuron in aqueous suspensions ofTiO2. Analytical and kinetic studies release_ir642nual5cn3gbczigy5cpgpi

by Amina Amine Khodja, Bernadette Lavedrine, Claire Richard, Tahar Sehili

Published in International Journal of Photoenergy by Hindawi Limited.

2002   p147-151

Abstract

The photocatalytic degradation of metoxuron [3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea] in aqueous suspensions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\text{TiO}}_{\text{2}} $"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math>was investigated. Several intermediate photoproducts were identified using NMR and MS techniques. Oxidation or removal of the methyl of terminal nitrogen and ring hydroxylation were found to occur. 2-Propanol was shown to decrease the rate of photocatalytic degradation, inhibiting partly ring hydroxylation and completely reactions on terminal nitrogen. In contrast, basification of the suspensions accelerated the degradation significantly. Degussa P25<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\text{TiO}}_{\text{2}} $"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math>was found to exhibit a higher photocatalytic activity than Millennium<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\text{TiO}}_{\text{2}} $"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math>in spite of a generally smaller specific surface area. Within the Millennium<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\text{TiO}}_{\text{2}} $"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math>series, the photocatalytic efficiency increased with the specific surface area.
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