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纳米SnO2/TiO2电极的制备及其电催化降解间-硝基苯酚

朱传高*,王凤武,徐迈,方文彦   

  1. (淮南师范学院化学系 淮南 232001)
  • 收稿日期:2012-09-10 修回日期:2012-10-14 出版日期:2013-05-10 发布日期:2013-05-10
  • 通讯作者: 朱传高，副教授; Tel/Fax:0554-6863586; E-mail:zhucg88@126.com; 研究方向：纳米材料合成及电化学
  • 基金资助:
    国家自然科学基金项目（21176099），安徽省教育厅自然科学基金重点项目（KJ2010A309）

Preparation of Nano-crystalline SnO2/TiO2 Electrode and Its Electro-catalytic Degradation Toward m-Nitrophenol

ZHU Chuangao*, WANG Fengwu,  XU Mai, FANG Wenyan   

  1. (Department of Chemistry,Huainan Normal College,Huainan  232001,China)
  • Received:2012-09-10 Revised:2012-10-14 Published:2013-05-10 Online:2013-05-10

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摘要： 用电化学方法在乙二醇溶液中制备锡、钛醇盐配合物Sn0.75Ti(OCH2CH2OH)(7-x)，将电解液水解、干燥后在400 ℃煅烧2 h，得到纳米级SnO2/TiO2粉体。 通过红外光谱(FT-IR)和拉曼光谱(Raman)对电解产物进行测试，纳米SnO2/TiO2粉体通过X射线粉末衍射(XRD)和扫描电子显微镜(SEM)进行表征。 实验表明，在有机体系电解得到的纳米SnO2/TiO2粉体颗粒分散较理想，粒径在100~200 nm。 再通过溶胶凝胶法在钛丝表面得到纳米SnO2/TiO2电极，采用循环伏安法研究电极在酸性溶液和间硝基苯酚溶液中的氧化还原行为和电催化活性。 结果表明，纳米TiO2掺杂SnO2电极的氧化峰电流达到143×10-3 A/cm2，氧化还原峰电位差明显减小，催化降解间-硝基苯酚的COD去除率达到86.1%，具有较高的电催化活性。

关键词: 醇盐配合物, 纳米SnO2/TiO2电极, 电催化, 间-硝基苯酚

Abstract: The precursor Sn0.75Ti(OCH2CH2OH)(7-x) was synthesized by electrolysis of titanium and tin in glycol solution. Nano-crystalline SnO2/TiO2 powder was prepared by direct hydrolysis from the precursor and then calcined for 2 h at 400 ℃.The metal alkoxide was characterized by FT-IR and Raman spectra. The mono-dispersed structure and the diameter of nano-SnO2/TiO2 were observed by XRD and SEM. The results showed that SnO2/TiO2 of 100~200 nm was obtained in organic solution. The highly active nano-SnO2/TiO2 electrode was prepared using electro-synthesis and sol-gel method. The cyclic voltammetry was used to study the redox behavior and electro-catalytic activity of the nano-SnO2/TiO2 electrode in HCl/m-NO2C6H4OH solution. The current density of the electrode increased obviously and reached to 143×10-3 A/cm2. The electrode potential difference of the redox peaks decreased obviously. The COD removal rate of m-nitrophenol reached to 86.1% and the SnO2/TiO2 electrode had high electro-catalytic activities.

Key words: metal alkoxide, nano- SnO2/TiO2, Electro-catalysis, m-Nitrophenol

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