Journal of Industrial and Engineering Chemistry, Vol.20, No.3, 752-758, May, 2014
Studies on the electrochemical degradation of Acid Orange II wastewater with cathodes modified by quinones
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The electrochemical oxidation of dye wastewater with the cathode modified by quinones has been investigated. Under the optimal conditions, the decolorization efficiency can reach 96.0% after 120 min. The addition of tert-butanol significantly decreased the decolorization efficiency, suggesting the involvement of ㆍOH radicals in the decomposition of H2O2. A potential difference may result in a quinone radical on the cathode which can catalyze the reduction of O2 to H2O2. UV-vis spectrum and GC/MS analysis revealed that the dye molecule was firstly initiated by the cleavage of -N=N-, and decomposed to aromatic intermediates, further degraded to ring opening products and finally mineralized.
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