Anodic oxidation of a water-soluble copper phthalocyanine dye with different operating parameters

Abstract An important category of reactive dyes is phthalocyanine dyes. They are water-soluble metal complexes, mostly containing copper. They have inherent characteristics such as color fastness, chemical and photolytic stability, and resistance to oxidative degradation. However, the explicit characteristics of phthalocyanine dyes make it particularly difficult to remove them from textile wastewater. This study focused mainly on the electrochemical decolorization of Reactive Blue 21 (RB21) textile phthalocyanine in aqueous solution. The influence of operating variables on the efficiency of the decolorization was investigated, including anode material, supporting electrolyte, current density and initial pH. The chronopotentiometry technique was used to perform the electrooxidation of the studied dye at room temperature (20 °C).