Abstract

Aromatic nitro dyes are resistant to chemical and biological oxidation and to hydrolysis because of electron withdrawing nitro groups. Consequently they are environmentally persistent and remediation of waste streams and contaminated water is difficult. In the present work, the electrochemical study has been carried out on the nitro acid dye naphthol yellow S predominantly used in textile dyeing. On the basis of results of the electrochemical study experimental conditions are optimized for the controlled potential electrolysis or the model dye. Complete decolourisation resulted after 1 to 3 h of controlled potential electrolysis. Kinetics of decolourisation was monitored and half-life period determined. Chromatographic study revealed formation of single decomposition product and COI) decreased substantially in the decolourised solution.

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