Electrochemical treatment of wastewaters containing 4‐chlororesorcinol using boron doped diamond anodes |
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Authors: | Bensalah Nasr Gadri Abdelatif |
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Affiliation: | 1. Department of Chemistry, Faculty of Sciences of Gabès, University of Gabès, Zrig 6072, Gabès, Tunisia;2. Department of Chemical Engineering, High School of Engineering of Gabès, University of Gabès, Zrig 6072, Gabès, Tunisia |
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Abstract: | The electrochemical oxidation of aqueous wastes polluted with 4‐chlororesorcinol has been studied on boron‐doped diamond electrodes on acidic medium. The voltammetric results showed that in the potential region where the supporting electrolyte is stable, reactions occur, resulting in the loss of activity due to electrode fouling. Galvanostatic electrolysis study showed that the oxidation of these wastes in single‐compartment electrochemical flow cell with boron doped diamond anodes deal to the complete mineralization of the organics but is no indication of electrode fouling. Resorcinol, 1,2,4‐trihydroxybenzene, benzoquinone, maleic, fumaric, and oxalic acids have been detected as soluble organics and chlorides (Cl?) and hypochlorites (ClO?) as mineral products during the electrolysis of 4‐chlororesorcinol. The electrochemical oxidation of 4‐chlororesorcinol consists of a sequence of steps: Release of Cl and/or hydroxylation of the aromatic ring; formation of quinonic compounds; oxidative opening of aromatic ring to form carboxylic acids; and oxidation of carboxylic acids to carbon dioxide. Both, direct oxidation at boron doped diamond surface and mediated oxidation by powerful oxidants electrogenerated from electrolyte oxidation at anode surface are involved in these stages. |
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Keywords: | electrochemical treatment 4‐chlororesorcinol boron doped diamond cyclic voltammetry galvanostatic electrolysis |
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