UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

The photodegradation of disperse violet 63 dye was investigated in aqueous solution using UV/H₂O₂, UV/H₂O₂/SnO₂ and Fenton reagent. The maximum decolorization was achieved in 60 min with 50 mg l⁻¹ of dye concentration. The suitability of each process depends upon dye concentration. The photo degradation is very effective at low dye concentration. The degradation percentage increased by enhancing initial amount of hydrogen peroxide and UV irradiation time. The influence of operational parameters like pH, H₂O₂ concentration, catalyst amount and dye concentration were investigated. After 60 min reaction time, the maximum decolorization of disperse violet 63 with UV/H₂O_2, UV/H₂O₂/SnO₂ and Fe/H₂O₂ was 81%, 92.7% and 96.4% respectively. The results indicated that Fenton process had more photocatalytic activity for degradation of disperse violet 63 dye than that of UV/H₂O₂ and UV/H₂O₂/SnO₂. After 60 min, the comparative decomposition order was Fe/H₂O₂ > UV/H₂O₂/SnO₂ > UV/H₂O_2. It may be concluded that Fenton process could possibly be used for the remediation of toxic pollutants from textile effluents. (paper)