A COMPARISON OF ELECTRODEPOSITED Ti/beta-PbO2 AND Ti-Pt/beta-PbO2 ANODES IN THE ELECTROCHEMICAL DEGRADATION OF THE DIRECT YELLOW 86 DYE

The electrochemical performance of electrodeposited Ti/beta-PbO2 and Ti-Pt/beta-PbO2 anodes was galvanostatically evaluated (batch mode, 50 mA cm(-2)) to degrade the Direct Yellow 86 dye (100 or 200 mg L-1 in 0.1 mol L-1 Na2SO4 + 1.5 g L-1 NaCl), investigating the effect of pH and temperature. Similar results were obtained for both electrodes and the best conditions for removal of color and chemical oxygen demand are pH 7 and 40 degrees C, when 90% decolorization is attained by passing a charge of only similar to 0.13 A h L-1 and total mineralization is achieved with expenditure of similar to 5 kW h m(-3).