Electrochemical degradation of naphthol AS-BO batik dyes

Nahptol AS-BO is one of the synthetic dyes often used in the dyeing process of batik fabric. The treatment of the wastewater released is a serious problem from an environmental point of view. The present investigation is focused at constant potential electrochemical degradation of naphthol AS-BO using a nanoporous carbon paste electrode in a solution containing NaCl as a supporting electrolyte. The effect of the potential applied, the solution pH and the degradation time is followed. It is found that the optimum values of the potential and pH refer to 12 V and 1, correspondingly. It is experimentally verified that the degradation process is of ECE mechanism, while the rate-determining chemical step is of a second order. The method studied provides COD value decrease to 90.84 %, while naphthol AS-BO presence decreases to 88.74 %.