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Results of electrochemical oxidation of two reactive dichlorotriazine dyes: Reactive Red 2 and Reactive Blue 81, are presented in this paper. Two electrode materials: Ti/TiO2(70%)–RuO2(30%) and carbon felt, were applied in the investigations as anodes. Voltammetric measurements show that Reactive Blue 81 electrooxidation proceeds easier and with higher rate than electrooxidation of Reactive Red 2. Both dyes are oxidised irreversibly in at least one electrode step before oxygen evolution starts at the electrode. Effectiveness of electrochemical oxidation under potentiostatic conditions achieved for Reactive Blue 81 was higher than for Reactive Red 2, with application of a carbon felt anode. Pulse radiolysis measurements prove addition of •OH radical to the dye molecule and formation of cyclohexadienyl and naphthoxyl radicals. Results of voltammetric analysis, pulse radiolysis measurements and GC–MS identification of intermediate products suggest two possible pathways of the dyes electrochemical oxidation.
Journal of Applied Electrochemistry – Springer Journals
Published: Sep 17, 2010
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