Irradiation treatment of azo dye containing wastewater: An overview

The radiation-induced decolouration and degradation of aqueous solutions of azo dyes and their model compounds (anilines, phenols, triazines) are reviewed together with practical applications and the experimental methods (pulse radiolysis, steady-state gamma radiolysis, as well as end-product analysis) used for studying the reactions. The proposed mechanisms and the rate coefficients for the reactions of (OH)-O-center dot, e(aq)(-) and H-center dot water radiolysis intermediates with the dye molecules and with model compounds are summarized. (C) 2007 Elsevier Ltd. All rights reserved.