A B S T R AC TThis work investigated the electrocatalytic degradation of three types of textile dyes by electrochemical oxidation on lead dioxide anode. The infl uence of pH, current density, time of electrolysis, temperature, the conductive salt concentration and the initial dye concentrations were critically examined. The results of these infl uences are expressed in terms of the remaining organic compounds concentrations (color removal) and Chemical Oxygen Demand (COD removal). Also, both of the current effi ciency and power consumption values are calculated. In this manuscript we report that, the highest electrocatalytic activity was achieved in the presence of NaCl (3 g/l), 30 mA/cm 2 , pH of 3 and temperature of 30 °C. The highest electroactivity could be attributed to indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. In addition, contribution from direct oxidation could also be possible via reaction of these dyes with the electrogenerated hydroxyl radicals adsorbed on the lead dioxide surface.

mit R = Alkylgruppe mit Clo, 11, 12, 13, 1s und 17) ist durch die Langmuir'schen Adsorptionsisothermen zu erklaren. Bei einer gegebenen Tensidkonzentration nimmt die inhibierende Wirkung mit der Lange der Kohlenstoffkette zu. Zu erwahnen ist auch der EinfluB von induktiven und sterischen Behinderungseffekten durch Methylengruppen (in -R) auf den Hemmwert.

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