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Kinetics and mechanism for dye degradation with ionic Pd-substituted ceria

Deshpande, Parag A and Jain, Disha and Madras, Giridhar (2011) Kinetics and mechanism for dye degradation with ionic Pd-substituted ceria. In: Applied Catalysis A: General, 395 (1-2). pp. 39-48.

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Official URL: http://dx.doi.org/10.1016/j.apcata.2011.01.020


The degradation of the dye, Orange G, was carried out in the presence of H2O2 and Pd-substituted/impregnated CeO2. The effects of pH, initial dye concentration, initial H2O2 concentration, temperature, catalyst loading, and Pd content in the catalyst on the degradation of the dye were investigated. Eight to twelve percent degradation of the dye was obtained in 1 h when the reaction was carried out in the presence of CeO2 or H2O2 or Pd-substituted/impregnated CeO2 while 17% and 97% degradation was obtained when H2O2 was used with Pd-impregnated CeO2 and Pd-substituted CeO2, respectively. This difference clearly indicated that the ionic substitution of Pd played a key role in the degradation of the dye. A mechanism for the reaction was proposed based upon the catalyst structure and the electron transfer processes that take place in the metal ion substituted system in a reducible oxide. The reaction was found to follow first order kinetics and the influence of all the parameters on the degradation kinetics was compared using the rate constants. (c) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: Applied Catalysis A: General
Publisher: Elsevier Science B.V.
Additional Information: Copyright of this article belongs to Elsevier Science B.V.
Keywords: Advanced oxidation processes;Ionic substitution;Electron transfer;Dye degradation;Reaction mechanism;Kinetics
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 19 Apr 2011 08:11
Last Modified: 19 Apr 2011 08:11
URI: http://eprints.iisc.ac.in/id/eprint/36976

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