Electrochemical Degradation of Refractory Pollutant Using a Novel Microstructured TiO2 Nanotubes/Sb-Doped SnO2 Electrode

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• 作者：Guohua Zhao* ; Xiao Cui ; Meichuan Liu ; Peiqiang Li ; Yonggang Zhang ; Tongcheng Cao ; Hongxu Li ; Yanzhu Lei ; Lei Liu ; Dongming Li
• 刊名：Environmental Science & Technology
• 出版年：2009
• 出版时间：March 1, 2009
• 年：2009
• 卷：43
• 期：5
• 页码：1480-1486
• 全文大小：296K
• 年卷期：v.43,no.5(March 1, 2009)
• ISSN：1520-5851

文摘

A novel Sb-doped SnO₂ electrode featuring high oxygen evolution potential, excellent electrocatalytic performance, and long stability toward electrochemical degradation of refractory organic pollutants was constructed by designing and regenerating the microstructure of the Ti substrate. Highly ordered TiO₂ nanotubes (TiO₂−NTs) with three-dimensional microstructure, large specific surface area and space utilization rate could be grown in situ on Ti substrate under controlled conditions, followed by being implanted with Sb-doped SnO₂ through a surfactant-assisted, sol−gel method under vacuum environment. The amount of Sb-doped SnO₂ and service lifetime for the constructed electrode (TiO₂−NTs/SnO₂) were 2.4 and 12 times as much as those for a traditional Sb-doped SnO₂ (SnO₂) electrode. Moreover, the constructed electrode performed at higher oxygen evolution potential and exhibited superior electrochemical capability to that on SnO₂ electrode. Compared with low TOC removal by the SnO₂ electrode, the TiO₂−NTs/SnO₂ electrode could completely mineralize benzoic acid (BA) under the same condition. The mineralization current efficiency and the first-order kinetic constant for BA degradation at the TiO₂−NTs/SnO₂ electrode were 1 and 3.5 times greater than those observed for the SnO₂ electrode.