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Degradation of Dye Azure B by Electrochemical Advanced Oxidation Processes

In this work the electrochemical degradation of the dye Azure B in aqueous solutions was studied by Electrochemical Advanced Oxidation Processes (EAOPs) electro-Fenton and anodic oxidation processes using Pt/carbon-felt and BDD/carbon-felt cells with H2O2 electrogeneration. The higher oxidation power of the electro-Fenton process using BDD anode was demonstrated. The oxidative degradation of Azure B by the electrochemically generated OH radicals follows a pseudo-first order kinetics. The apparent rate constants of the oxidation of Azure B by OH were measured according to pseudo-first order kinetic model. The absolute rate constant of Azure B hydroxylation reaction was determined by competition kinetics method and found to be 1.19 x 10 M s. It was found that the electrochemical degradation of the dye leads to the formation of aromatic by-products which are then oxidized to aliphatic carboxylic acids before their almost mineralisation to CO2 and inorganic ions (sulphate, nitrate, and ammonium). The evolution of the TOC removal and time course of short-chain carboxylic acids during treatment were also investigated. Key-words: Azure B, Electrochemical advanced oxidation processes, electro-Fenton, Anodic oxidation, BDD.