Removal of an Azo Dye (Orange G) By Various Methods in Homogenious Phase. Comparative Study

Abstract

The dyes are considered as one of the biggest sources of water pollution. Degradation of these compounds have to be carried out via, photolysis, acetone/UV and AOT's (Advanced Oxidation Technologies) due to their weak biodegradation or their high persistence in different compartments of the environment. In this study, UV alone and combined to acetone, H₂O₂, S₂O₈^2-, Fenton and photo-Fenton reactions were investigated in lab-scale experiments for the degradation of Orange G. The attribution of UV-vis bands of dye has been performed by molecular modelisation, using Density Functional Theory DT-DFT and to be compared the experimental ones. The degradation rate is strongly dependent on the initial concentrations of the H₂O₂, S₂O₈^2-, acetone and Fe²⁺. The effect of these parameters has been studied and the optimum operational conditions of these processes were found.