Abstract
Novel Sb-doped SnO2 ceramic electrodes sintered at different temperatures, are applied to the degradation of Reactive Black 5 in both divided and undivided electrochemical reactors. In the undivided reactor the discoloration of the solution took place via the oxidation of RB5 dye, without the corresponding reduction in the chemical oxygen demand for the ceramic electrodes. However, in the divided one, it was possible to achieve the discoloration of the solution while at the same time decreasing the chemical oxygen demand through the ·OH-mediated oxidation, although the chemical oxygen demand degradation took place at a slower rate.
Highlights
Novel Sb-doped SnO2 ceramic electrodes sintered at different temperatures, are applied to the degradation of Reactive Black 5 in both divided and undivided electrochemical reactors
Mineralization of Reactive Black 5 (RB5) with Sb-doped SnO2 ceramic electrodes in divided and undivided electrochemical reactors has been studied in the present work
High discoloration rates were reached at 595 nm with ceramic electrodes, but new bands appeared indicating the formation of an isoxazole derivative formed by the cyclization of the RB5 molecule in the oxidation process
Summary
Novel Sb-doped SnO2 ceramic electrodes sintered at different temperatures, are applied to the degradation of Reactive Black 5 in both divided and undivided electrochemical reactors. In the undivided reactor the discoloration of the solution took place via the oxidation of RB5 dye, without the corresponding reduction in the chemical oxygen demand for the ceramic electrodes. One of the most widely used anode for the electrochemical degradation of pollutants is the BDD, which has the highest overpotential for oxygen evolution[27,28,29]. These anodes are expensive and their manufacture is complicated, due to the difficulty of finding cheaper materials for the deposition of the diamond layer[30]
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