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ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
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Research Article

ZnO-Assisted Photocatalytic Degradation of Congo Red and Benzopurpurine 4B in Aqueous Solution

Elaziouti1*, N. Laouedj2 and Bekka Ahmed1
1LCPCE Laboratory, Faculty of sciences, Department of Industrial Chemistry, University of the Science and the Technology of Oran (USTO M.B). BP 1505 El M'naouar 31000 Oran, Algeria
2Dr. Moulay Tahar University, Saida, Algeria
Corresponding Author : Dr. Elaziouti
LCPCE Laboratory, Faculty of sciences
Department of Industrial Chemistry
University of the Science and the Technology of Oran (USTO M.B) BP 1505 El M'naouar 31000 Oran, Algeria
Tel: (213) 0551723590
Fax: (213) 041560050
E-mail: [email protected]
Received March 10, 2011; Accepted April 25, 2011; Published May 13, 2011
Citation: Elaziouti, Laouedj N, Ahmed B (2011) ZnO-Assisted Photocatalytic Degradation of Congo Red and Benzopurpurine 4B in Aqueous Solution. J Chem Eng Process Technol 2:106. doi:10.4172/2157-7048.1000106
Copyright: © 2011 Elaziouti, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

The photocatalytic degradation of two commercial azo dyes Congo red (CR) and Benzopurpurine 4B (BP4B) in aqueous solution was investigated under UV-A light at different operating conditions, including irradiation time, pH solution, initial dye concentration, amount of catalyst, light intensity as well as band gap of other semiconductor groups by UV-spectrophotometric monitoring. The highest decomposition were obtained at pH 8 as a result of 95.02 and 97.24 % degradation efficiencies of CR and BP4B for 60 and 80min of irradiation time respectively. Photodecomposition reactions of both dyes were correlated with pseudo-first-order kinetic model. For BP4B, the degradation data were satisfactory described by Langmuir–Hinshelwood (L-H) mechanism, whereas those of CR were not sufficient to conclude that the L-H mechanism is the most suitable one to describe the photocatalytic process of CR. These findings can support the design of remediation processes and also assist in predict their fate in the environment.

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