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International Journal of Photoenergy
Volume 2008, Article ID 197346, 7 pages
http://dx.doi.org/10.1155/2008/197346
Research Article

Photocatalyzed Degradation of a Pesticide Derivative Glyphosate in Aqueous Suspensions of Titanium Dioxide

1Centre for Material Science, University of Central Lancashire, Preston PR1 2HE, UK
2Department of Chemistry, Aligarh Muslim University, Aligarh-202002, India

Received 24 July 2007; Revised 30 November 2007; Accepted 17 March 2008

Academic Editor: Russell Howe

Copyright © 2008 Mohammad Muneer and Colin Boxall. 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 a herbicide derivative, glyphosate [(N-phosphonomethyl) glycine] has been investigated in aqueous suspensions of titanium dioxide at different pH values. This compound was found to degrade more efficiently under alkaline pH, where no adsorption takes place on the surface of the catalyst in the dark. The main degradation route involves the cleavage of the P–C bond giving rise to sarcosine and glycine as the intermediate products formed during the photooxidation process.