Advanced electrochemical degradation of basic yellow 28 textile dye using IrO2/Ti meshed electrode in different supporting electrolytes

Abstract One of the most concerning recent environmental threats is textile wastewater effluents. Although versatile methods exist for the treatment of textile effluents, electrochemical degradation is considered an efficient and promising approach. In the present study, the effect of an IrO2/Ti meshed electrode in the presence of Na2SO4 or NaCl as a supporting electrolyte on the decolorization and mineralization of Basic Yellow 28 (BY28) textile dye is demonstrated. The results showed that the optimum conditions were a current density of 0.03A cm−2, initial dye concentration of 2 × 10−5 M, pH of 2.5 or 6.5 for Na2SO4 or NaCl, and a supporting electrolyte concentration of 0.08 or 0.03 M for Na2SO4 or NaCl, respectively. The degradation efficiency was followed using Ultraviolet-visible (UV–Vis) spectrophotometry, cyclic voltammetry, and chemical oxygen demand (COD). Cyclic voltammetry was carried out in the potential window from +1.0 V to −1.0 V. After 15 min, the color removal of the BY28 dye was 92.9% and 93.3% and the COD removal was 26.8% and 46.2% in the presence of Na2SO4 and NaCl, respectively. Besides, the corresponding current efficiency and energy consumption were estimated to validate the proposed electrochemical method. The results revealed that NaCl was more powerful than Na2SO4 as a supporting electrolyte.