" Treatment of industrial wastewater using electrocatalytic oxidation technique "

Abstract

This work deals with the possibility of preparation of some modified electrodes which can be used as anodes for the electrocatalytic oxidation process of dyestuffs in their simulating solutions. The metals Pd, Pt, Rh, Au, and alloys Pd-Rh, Pt-Rh were electrodeposited on the previously anodized Ti substrates. The prepared electrodes are thermally activated at temperatures of 200, 350, 550 °C. These electrodes were characterized by SEM-Edax and X-ray diffraction techniques. Some electrodes were selected from those thermally activated at 350°C for the use as anodes in the treatment process of dyestuffs. The dyestuffs included acid green dye, (basic dye), and methylene blue. The results of electrocatalytic oxidation process of the dyestuff solutions were expressed in terms of the remaining dye concentration and COD removal, which were determined instrumentally. The different operating conditions of treatment process were studied which include: current density, pH, temperature, time, type of conductive electrolyte and its concentration, and initial dye concentration. The optimum operating conditions for each dye and modified electrode were determined. The undertest modified electrodes gave good results for the complete removal of dye and COD. These optimum operating conditions were applied for the treatment of sulphur black dye in its true wastewater. Key wm•ds: modified electrodes, titanium modified electrodes, electrodeposition, heavy metals, electrocatalysis, textile wastewater, wastewater treatment, electrooxidation .