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 H 2 O 2 , the concentration of FeSO 4 , 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 H 2 O 2 1.14×10-2 M, the concentration of FeSO 4 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.

Fenton degradation of azo dyes

“…These dyes are also very resistant to natural biological degradation [3]. There are several studies related to the use of Fenton reaction for the removal of azo dyes from wastewaters [4][5][6].…”