中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (01): 63-68.

• 研究论文 • 上一篇    下一篇

凹凸棒黏土-SnO2-TiO2复合材料的制备及其光催化性能

张莉莉1,2,吕伏建1,刘建全1,汤超1,汪信1*   

  1. (1.江苏省低维材料重点建设实验室，淮阴师范学院 淮安；2.南京理工大学材料化学实验室 南京 210097)
  • 收稿日期:2009-01-04 修回日期:2009-05-04 出版日期:2010-01-10 发布日期:2010-01-10
  • 通讯作者: 汪信，男，教授，博士生导师; E-mail:wxin@public1.ptt.js.cn; 研究方向：纳米材料化学
  • 基金资助:
    江苏省高校科研成果产业化推进项目（JH08-31）江苏省教育厅自然科学基金（07KJB430010）中国博士后基金（20060400941）江苏省博士后基金（0602003A）淮安市科技（HAG08072）资助项目，淮阴师范学院大学生创新训练计划

Synthesis of Attapulgite-SnO2-TiO2 Nanocomposites and Their Photocatalytic Property

ZHANG Li-Li1,2, LV Fu-Jian1, LIU Jian-Quan1, TANG Chao1, WANG Xin1*   

  1. (1.aJiangsu Key Laboratory for Chemistry of LowDimensional materials,Huaiyin Normal University,Huai′an;2.Nanjing University of Science and Technology,Nanjing 210094)
  • Received:2009-01-04 Revised:2009-05-04 Published:2010-01-10 Online:2010-01-10

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摘要：

以凹凸棒黏土为基体，通过原位溶胶-凝胶包覆工艺，将SnO2-TiO2复合氧化物负载于凹凸棒黏土表面制备凹凸棒黏土复合光催化剂(Att-SnO2-TiO2)。采用XRD、BET、TEM等分析测试技术对产物进行了表征。结果表明，SnO2-TiO2复合氧化物均匀地负载于凹凸棒黏土表面，其平均粒径约为10 nm；经过复合氧化物负载改性后，凹凸棒黏土的表面形貌得到明显改善，产物的包覆效果好、比表面大。以光催化降解甲基橙为探针，研究了凹凸棒黏土复合光催化剂的光催化性能。结果表明,凹凸棒黏土复合光催化剂显示出优异的光催化性能，其光催化活性顺序为Att-SnO2-TiO2>Att-SnO2>Att-TiO2。以性能最佳的Att-SnO2-TiO2为催化剂光降解甲基橙30min后，甲基橙的降解率达99%。实验表明，Att-SnO2-TiO2复合光催化剂可重复利用。

关键词: SnO2-TiO2, 光催化, 凹凸棒黏土, 负载, 溶胶-凝胶

Abstract:

Attapulgite (Att) was taken as the matrix of SnO2-TiO2 hybrid oxide to synthesize a novel kind of composite photocatalyst. The composite photocatalyst (marked as Att-SnO2-TiO2) were fabricated by depositing SnO2-TiO2 hybrid oxides on the surface of Att using in stiu sol-gel technique. The obtained products were characterized by X-Ray diffraction (XRD), BET surface area and Transmission electron microscope (TEM) methods. It was found that the surface morphology of the original attapulgite was effectively reformed and SnO2-TiO2 nanocomposites averaged at about 10 nm were loaded successfully on the surface of Att fibers with high dispersibility. Correspondingly, the BET surface area of Att composites was close to that of original Att suggesting the loading impact was quite successful. Photocatalytic removal of methyl orange under ultraviolet radiation was studied using attapulgite (Att) composites. Results showed that the Att composite photocatalysts presented preferable photocatalytic property, and the photoactivity of the composite photocatalyst decreased in a sequence of Att-SnO2-TiO2 > Att-SnO2 > Att-TiO2. The Att-SnO2-TiO2 took on the excellent activity and the decomposition rate of methyl orange was up to 99% within 30min when the Att-SnO2-TiO2 powder was used as the photocatalyst. The repeated use of the composite photocatalyst was also confirmed.

Key words: SnO2-TiO2, photocatalyst, attapulgite, Loading, sol-gel techniaue

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