Decolorization of Acid Dye Useing Sono-Based Processes: Sonoelectrochemical, Sonophotoelectrochemical and Sonophotoelectro-Catalysis

In recent years, combinatorial methods have attracted a great deal of attention. Among them, sono-combining techniques have shown a significant potential as an economic technology applicable and environment-friendly technology for wastewater treatment. In this study, Sono Electrochemical (SE), Sono Photo Electrochemical (SPE) and Sono Photo Electro Catalytic (SPEC) techniques were investigated for decolorization of Acid Red 88 (AR88). It was found that SPEC is capable of decolorizing AR88 entirely after 35minutes by using Ni-TiO2 as a catalyst with higher efficiency than SPE and SE techniques. The results are also shown that SPE had more yield than SE because in the case of SPE, the process was performed not only by sonolysis but also by photoelectrolysis. Furthermore, initial concentration of dye, initial pH, current density and concentration of supporting electrolyte were investigated and the optimum conditions were obtained. Based on the obtained results, SPEC is an appropriate technology for decolorizing of acid dyes completely with a faster rate. Photocatalyst efficiency was evaluated using SEM and XRD techniques. The characterization of the post-treated product using HPLC studies revealed intermediate compounds.