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International Journal of Photoenergy
Volume 2006, Article ID 81808, 6 pages

Photodegradation of chlorbromuron, atrazine, and alachlor in aqueous systems under solar irradiation

Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Avenue Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos 62210, Mexico

Received 16 April 2006; Accepted 5 June 2006

Copyright © 2006 Cristina Lizama Bahena and Susana Silva Martínez. 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.


Homogeneous and heterogeneous aqueous systems of the herbicides of chlorbromuron, atrazine, and alachlor were irradiated with a nonexpensive solar irradiation using a photoreactor with recirculation. Photodegradation of these herbicides occurred in both aqueous systems; however the presence of TiO2 clearly accelerated the degradation of the three herbicides in comparison with direct photolysis. Degradation was followed by measuring the chemical oxygen demand (COD) as a function of reaction time for each aqueous system. Over 90% of COD abatement in the heterogeneous aqueous system was obtained in a short time period showing that mineralization of chlorbromuron, atrazine, and alachlor was achieved.