Photo-oxidative degradation of Direct Yellow 12 using hydrogen peroxide

The photo-oxidation process by combination of UV light and H2O2 generates h ydroxyl radicals which are capable of oxidising many organic compounds whic h are refractory type and difficult to oxidize by conventional chemical tre atment. In the present study, photo-oxidation of Direct Yellow 12 (DY 12) d ye has been carried out in an annular type photoreactor using 8 Watt low pr essure mercury lamp along with H2O2 as oxidant. Synthetic dye solutions of 50 mg/L concentration were used to carry out the experiments. Complete dye degradation and colour removal took place within 30 min with 85-95% reducti on in COD (Chemical Oxygen Demand) value. The process of degradation is dep endent upon the pH of the solution.