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Water Science & Technology Vol 65 No 12 pp 2175–2182 © IWA Publishing 2012 doi:10.2166/wst.2012.136 Degradation of azo dye with dirhodium(II) caprolactamate as heterogeneous catalystAbeer S. Elsherbiny, Sahar H. El-Khalafy and Michael P. DoyleChemistry Department, Faculty of Science, Tanta University, Tanta 31527, Egypt E-mail: abeer.elsherbiny@yahoo.deDepartment of Chemistry, Science and Art College, King Abdul Aziz University, Rabigh Campus, Rabigh 21911, Kingdom of Saudi Arabia Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA ABSTRACT The kinetics of the oxidative degradation of an azo dye Metanil Yellow (MY) was investigated in aqueous solution using dirhodium(II) caprolactamate, Rh2(cap)4, as a catalyst in the presence of H2O2 as oxidizing agent. The reaction process was followed by UV/Vis spectrophotometer. The decolorization and degradation kinetics were investigated and both followed a pseudo-first-order kinetic with respect to the [MY]. The effects of various parameters such as H2O2 and dye concentrations, the amount of catalyst and temperature have been studied. The studies show that Rh2(cap)4 is a very effective catalyst for the formation of hydroxyl radicals HO• which oxidized and degraded about 92% of MY into CO2 and H2O after 24 h as measured by total carbon analyzer. Keywords: catalytic oxidation; kinetic; Metanil Yellow eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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