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

Paper ID Volume ID Publish Year Pages File Format Full-Text
41501 45891 2011 10 PDF Available
Title
Kinetics and mechanism for dye degradation with ionic Pd-substituted ceria
Abstract

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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (56 K)Download as PowerPoint slideResearch highlights► Ionically substituted Pd in CeO2 was used for dye degradation. ► The effects of various parameters on dye degradation were studied. ► A mechanism consistent with the structure of the catalyst was proposed. ►Elementary surface processes were proposed and rate expressions were obtained.

Keywords
Advanced oxidation processes; Ionic substitution; Electron transfer; Dye degradation; Reaction mechanism; Kinetics
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Kinetics and mechanism for dye degradation with ionic Pd-substituted ceria
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 395, Issues 1–2, 15 March 2011, Pages 39–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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