Catalytic Degradation of Eriochrome Black T Dye By Fenton and Photo-Fenton Reaction

Abstract

The oxidation with Fenton and photo-Fenton reaction in homogeneous system is an effective technology for destruction of a large number of different dyes. The effects of different parameters like the concentrations of H2O2, the concentration of FeSO4, the initial concentration of the dye and the pH of the solution on the degradation of eriochrome Black T (EBT) dye were carried out to investigate the process’s optimal operational conditions with the best results at low cost. A suitable operating conditions were selected as: the concentration of H2O2 1.14×10-2 M, the concentration of FeSO4 1.85×10-4 M, the initial concentration of EBT dye 9.34×10-5 M and the pH equal 3.2 at room temperature. In the given conditions, more than 98.37% of degradation efficiency was achieved within 60 min. of the reaction. Photo-Fenton reaction was investigated and it was found that the degradation efficiency increased from 94 % by Fenton reaction to 99.83% by photo-Fenton reaction at 15 min. The kinetic study indicated that the degradation kinetics of EBT dye followed the second-order kinetics.