Evaluation of the Effectiveness of UV/S2O82- Process in Removal Trace Anthraquinone C. I. Acid Blue 25 from Wastewater

In this research, the decolorization of Acid Blue 25 (AB25) was investigated at experimental conditions, using [GRAPHICS] process in a stirred batch reactor. It was discovered that the removal efficiency of AB25 is sensitive to the operational parameters such as initial concentration of [GRAPHICS] , temperature and initial pH of the solutions. Natural initial pH and room temperature were found to be the optimum conditions for the process. Optimum oxidant concentration required for the removal of AB25 was reduced in high temperatures. In this study, the maximum color removal efficiency of AB25 was found to be more than 95% at 60 degrees C in optimum conditions for 3mM peroxydisulfate concentration. The electrical energy per order (E (EO)) values was also calculated for decolorization of AB25 solution. The results showed that E (EO) can be reduced by applying a desired peroxydisulfate concentration. The value of process quantum yield was calculated in this experiment. The kinetics of the process were investigated and rate constant, activation energy, and frequency factor were calculated as 0.0331min(-1), 10.09 (kJ/mol), and 2.09 (mol/L)(-0.38)/min, respectively. Also, the degree of reaction was calculated to be the pseudo first-order as predicted.