DECOLORIZATION OF AZO DYES BY MODIFIED FENTON PROCESS

In the present study, the decolorization of C.I. Reactive Orange 127 (RO 127) and C.I. Reactive Yellow 145 (RY 145) by modified-Fenton process (Fe°/H2O2) was investigated. The experiments were carried out to determine the process’s optimal operational conditions: pH, Fe0 and H2O2 concentrations. This study shows that modified Fenton process is an efficient process for the decolorization of synthetic textile wastewater including azo dye and polyvynil alcohol (PVA). The optimal conditions experimentally determined was found to be initial pH = 3.5, [H2O2] = 20 mg/L, [Fe°]= 80 mg/L for RO 127 and pH = 4.0, [H2O2] = 20 mg/L, [Fe°] = 60 mg/L for RY 145. Under the optimal conditions, 92% and 80% decolorization were achieved after 60 min of reaction for RO 127 and RY 145, respectively.