Catalytic Efficient Electro-oxidation Degradation of DO26 Textile Dye via UV/VIS, COD, and GC/MS Evaluation of By-products

The importance of this research stems from the catalytic degradation of Direct Orange 26 (DO26) textile dye by electrochemical oxidation using graphite as an eco-friendly electrode material and gives satisfactory results. DO26 dye is widely applicable in the field of dying of different kinds of fibers (synthetic and natural). Also, it can be used in different kinds of pigments. The environmentally hazardous residue of this dye in wastewater actually needs to be treated. Therefore, this paper directed attention to not only decolorization but also degradation of the dye from synthetic and natural wastewater. The efficiency of the electrochemical oxidation was followed and checked using ultraviolet/visible spectrophotometer and COD measurements. The obtained results from the electrochemical oxidation process revealed that the successful decolorization and decomposition of the dye is 97.95% under selected proper conditions: pH = 2, current intensity 40 mA, using 300 mg NaCl with initial dye concentration 200 mg/L after 12 min with 74.54% COD reduction. The residual organic by-products were determined using GC–MS analysis. On the other hand, successful removal of the same dye has been checked by cyclic voltammetry under selective optimum conditions, which is in good agreement with and confirms electrochemical oxidation results. The successful application for removal of DO26 dye by this technique has been performed in an industrial wastewater sample, which indicates the possible use of this electrochemical oxidation in actual removal of DO26 in industrial textile wastewater.