alexa Photodegradation study of Congo Red in Aqueous Solution using ZnO/ UV-A: Effect of pH And Band Gap of other Semiconductor Groups | OMICS International
ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
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Research Article

Photodegradation study of Congo Red in Aqueous Solution using ZnO/ UV-A: Effect of pH And Band Gap of other Semiconductor Groups

Laouedj Nadjia1, Elaziouti Abdelkader2* and Bekka Ahmed2
1DR. Moulay Tahar University, Saida, Algeria
2LCPCE 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
Corresponding Author : Dr. Elaziouti Abdelkader
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 19, 2011; Accepted May 10, 2011; Published May 13, 2011
Citation: Nadjia L, Abdelkader E, Ahmed B (2011) Photodegradation study of Congo Red in Aqueous Solution using ZnO/UV-A: Effect of pH And Band Gap of other Semiconductor Groups. J Chem Eng Process Technol 2:108. doi:10.4172/2157-7048.1000108
Copyright: © 2011 Nadjia L, 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 Congo red in aqueous solution was investigated under UVA light at different operating conditions, including irradiation time, pH solution and band gap of MO2 (M=Ti+4 and Ce+4) and M’2O3 (M’=Al+3 and Fe+3) semiconductor groups by UV-spectrophotometric monitoring. The results showed slight stability of 597nm band of CR over the pH range of 6-7, while, it almost completely disappeared at pH higher than 7. Maximum photo degradation was obtained at pH 8 as a result of 95.02% degradation efficiency of CR for 60 min of irradiation time. The photo decomposition efficiency of MO2 (M=Ti+4 and Ce+4) semiconductor group was higher, compared to that of M’2O3 (M’=Al+3 and Fe+3). Photodecomposition reactions correlated with pseudo-first-order kinetic model. These findings can support the design of remediation processes and also assist in predict their fate in the environment.

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