Abstract
In this paper, the preparation conditions of antimony-doped SnO2 and PbO2 electrode were optimized for the degradation activity of AO7 dye solution. The results showed that when the doping content of Sb is 8 mol %(SnO2-Sb(0.08)), the SnO2 electrode exhibited best activities for the decolorization and mineralization of AO7. The concentration of NaF in electroplating solution had a noticeable effect on PbO2 electrode for the decolorization of AO7 solution, but little influence on the COD removal rate. The anodic stability tests showed that the electrode prepared in the solution containing 0.10 g l−1 NaF (PbO2-F(0.10)) was best for environmental application. The comparison of SnO2-Sb(0.08), PbO2-F(0.10) and Boron-doped Diamond (BDD) electrodes revealed that a more rapid decolorization rate was obtained on SnO2-Sb(0.08) and PbO2-F(0.10) electrodes in dilute AO7 solutions, while higher COD removal rate of concentrated AO7 solutions was on BDD and SnO2-Sb(0.08) electrodes. The effect of concentration of Na2SO4 on the degradation rate of AO7 was very notable on BDD electrode for its highest overpotential of oxygen evolution reaction. In the chloride-containing medium, the decolorization was accelerated greatly but the completed mineralization of AO7 was inhibited with the increasing of chloride ions concentration when these high-overvoltage anodes were used
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Published in Russian in Elektrokhimiya, 2008, vol. 44, No. 7, pp. 865–875.
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Mao, X., Tian, F., Gan, F. et al. Comparison of the performances of Ti/SnO2-Sb, Ti/SnO2-Sb/PbO2, and Nb/BDD anodes on electrochemical degradation of azo dye. Russ J Electrochem 44, 802–811 (2008). https://doi.org/10.1134/S1023193508070069
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DOI: https://doi.org/10.1134/S1023193508070069