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International Journal of Photoenergy
Volume 2012 (2012), Article ID 194823, 6 pages
http://dx.doi.org/10.1155/2012/194823
Research Article

Treatment of Pesticides in Wastewater by Heterogeneous and Homogeneous Photocatalysis

1Department of Drug Industry and Pharmaceutical Biotechnology, Grigore T. Popa University of Medicine and Pharmacy, 16 Universitatii Street, 700115 Iasi, Romania
2Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iasi, 73 Professor D. Mangeron Street, 700050 Iasi, Romania
3Department of Materials Chemistry, “Al. I. Cuza” University of Iasi, 11 Carol I Boulvard, 700506 Iasi, Romania
4Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Received 1 June 2012; Revised 10 August 2012; Accepted 21 August 2012

Academic Editor: Meenakshisundaram Swaminathan

Copyright © 2012 Catalina Daniela Stan et al. 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 effect of different heterogeneous and homogeneous photocatalytic systems on the oxidative degradation of mepiquat chloride in aqueous solutions was investigated. In the case of heterogeneous reactions, the influence of five factors was studied: the type of catalyst, photocatalyst concentration, pH, pesticide concentration, and the presence of H2O2 and/or Fe3+. For homogeneous catalysis, other factors were studied: the oxidising agent and the light source. Nearly complete degradation of mepiquat chloride was obtained after about 180 minutes in the presence of an acid medium (pH3) using a UV-A lamp and TiO2P-25 catalyst (0.5 g/L), for an initial pesticide concentration of 10 ppm. Degradation rates corresponding to homogeneous photocatalysis were lower compared to those corresponding to the use of TiO2 as the photocatalyst.