Decolorization of Direct Yellow R Dye from Aqueous Solution by Aluminum Anode Electrochemical

Abstract

The present study applied Aluminum anode electrochemical method to decolorize direct yellow R wastewater. Experiments were conducted in electrochemical cell system with dimensions of 60 mm ´ 40 mm ´ 2 mm, a steel cathode and aluminum anode. Decolorization efficiency and electrical energy consumption were also calculated to compare optimal values. The effects of factors consist of current density, initial pH, initial dye concentration and electrolyte solution concentration on color removal efficiency have been also investigated. The results of study suggested that direct yellow R dye decolorization was very effective by using treatment technique applied in the study. The optimal values of impact factors were also indicated by. The initial dye concentration of 50 mg/l, initial pH value of 6.76, and current density of 2.5 mA/cm2 and Na2SO4 electrolyte concentration of 0.1mol/L were optimal conditions for dye decolorization. Besides that, the dye decolorization might reached the highest efficiency of 96.1% once it was conducted at temperature of 20°C, electrode distance of 16 mm and electrolyte time of 60 minutes. Energy consumption for decolorization in conditions mentioned above was 2.399 kWh/kg-dye.