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International Journal of Photoenergy
Volume 2006, Article ID 46961, 9 pages

Treatment of wastewater dyeing agent by photocatalytic process in solar reactor

1Département de Chimie Physique des Réactions, UMR 7630 CNRS-INPL, ENSIC, 1 rue Grandville, BP 20451, Nancy Cedex 54001, France
2Faculty of sciences, Damascus University, P.O. BOX 5665, Damascus, Syrian Arab Republic
3Laboratoire des Sciences du Génie Chimique, UPR 6811 CNRS-INPL, ENSIC, 1 rue Grandville, BP 20451, Nancy Cedex 54001, France
4Laboratoire d'Automatique et d'Etude des Procédés, Faculté des Sciences Semlalia, Université Cadi Ayyad, Avenue Prince Moulay Abdellah, BP 2390, Marrakech 40000, Morocco

Received 31 March 2006; Accepted 7 April 2006

Copyright © 2006 O. Zahraa 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.


The photocatalytic decolorization of industrial textile dyes has been studied. The treatment was carried out on a solar reactor consisting in a flat active plane, tilted so as to face the sun and to allow the trickling of the water to be treated. Alternatively the reactor could be irradiated by an artificial source. After checking the system using salicylic acid, a conventional model molecule, the photocatalytic decolorization of Orange II, Yellow Drimarene, and Black Drimarene dyes was investigated. Artificial and solar irradiation gave comparable results although the heating by the sun reduced the amount of adsorption. The kinetics agrees with the Langmuir-Hinshelwood model and a discrepancy between adsorption constants deduced from the kinetic and adsorption experiments was interpreted by considering various types of adsorption sites. Orange II and Drimarene dyes decolorization kinetics are opposite limiting cases of the above model, as being of order 0 and 1 with respect to the dye, respectively.