Colour Removal From Acid Dye Using UV/Hydrogen Peroxide Based Advanced Oxidation Process In Presence Of Nano Catalysts

Abstract

Wastes from textile industry contain mainly synthetic dye effluents that cause toxic and persistent effect on human health and ecosystem. There are many methods available to treat the dye wastewater are classified as physical, chemical and biological processes such as adsorption, coagulation, precipitation, ion-exchange etc., Most of these processes have many disadvantages such as high cost, low efficiency, high generation of sludge etc., Advanced Oxidation Process is considered as the best process due to its wide applicability, total mineralization, low sludge generation, decomposition of intermediates, non-selective reactivity etc., In present study, the various methods in Advanced Oxidation Process such as Ultra violet light and Hydrogen peroxide were applied individually or in combinations to treat an acidic azo dye. The effect of various parameters such as contact time, oxidant concentration, solution pH and initial concentration of oxidant on the removal of dye were studied. The maximum dye colour removal greater than 94% was achieved in presence hydrogen peroxiode concentration of 2g/L and nano catalysts such as Al₂O₃, CuO, SiO₂ and Fe₂O₃ at pH of 3. In presence of UV light at pH-3, the performance of nano Al₂O₃, Fe₂O₃ and CuO were greater than 97% in presence of uv light. The performance of nano SiO₂ is low i.e 34.98%. UV/H₂O₂ reduces the contact time from 150 min to 40 min in presence of nano catalysts.