Ibrahim A. Salem
Tanta University, Egypt
Title: Homogeneous and Heterogeneous Catalytic Oxidation of Some Azo Dyes using Copper(II) ions
Biography
Biography: Ibrahim A. Salem
Abstract
The kinetics of the homogeneous and heterogeneous catalytic oxidation of three azo dyes in presence of copper ions / copper ions – supported zinc oxide was investigated in aqueous solutions. These dyes were Chromotrope 2B (C2B), Chromotrope 2R (C2R) and Chrysophenen (CRY). The reaction progress was followed by monitoring the decrease in absorbance at â„·max equals to 512, 511 and 401 nm respectively. The rate of reaction increased with increasing either the concentration of the dye and the catalyst, giving a plateau at high concentrations. On the other hand, the rate of reaction increased gradually with increasing hydrogen peroxide concentration attaining a maximum then decreased thenafter. The reaction rate was also increased with increasing pH and temperature and was found to be entropy controlled.