Photocatalytic TiO2-catalyzed degradation of bromophenol blue-mediated Mo(VI)-peroxo complexes inthe presence of SDS

Abstract

In the present study, the photocatalytic TiO2-catalyzed degradation of bromophenol blue (BPB)-mediated Mo(VI)-peroxo complexes in the presence of sodium dodecyl sulfate (SDS) under UV irradiation was investigated. The analytical variables, such as pH, TiO2 catalyst dosage, initial concentration of the dye, concentrations of H2O2, Mo(VI), and SDS influencing the photocatalytic degradation of BPB, were studied in detail. The obtained optimum conditions were as follows: pH 5.0, 0.5mL of 11.0mol L-1 H2O2, 200gL(-1) Mo, 0.02mmol L-1 SDS, 5mg L-1 dye, 1.0g L-1 TiO2. Under the optimized conditions, the percent removals have been 85.4 and 75.3% for TiO2-UV-H2O2-Mo(VI) system with and without SDS, while they are 65.2 and 59.4% for TiO2-UV system with and without H2O2. As a result, it has been observed that the maximum removal rate is obtained for TiO2-UV-H2O2-Mo(VI) in presence of SDS at premicellar concentration with a value of 85.4%. The removal rate of the dye was spectrophotometrically monitored at 590nm during the analysis.