Sn2+-TiO2的可见光催化活性及其在介孔蒙脱石上的负载

doi:10.3724/SP.J.1077.2011.00917

无机材料学报 ›› 2011, Vol. 26 ›› Issue (9): 917-922.DOI: 10.3724/SP.J.1077.2011.00917 CSTR: 32189.14.SP.J.1077.2011.00917

Sn²⁺-TiO₂的可见光催化活性及其在介孔蒙脱石上的负载

李芳菲, 杨殿范, 夏茂盛, 王岩, 蒋引珊

(吉林大学材料科学与工程学院, 汽车材料教育部重点实验室, 长春 130025)

收稿日期:2010-10-26 修回日期:2010-12-16 出版日期:2011-09-20 网络出版日期:2011-08-19
作者简介:李芳菲(1980-), 女, 博士, 讲师. E-mail: lff0432@163.com
基金资助:
国家自然科学基金(50574043, 40772028)

Visible-light Photocatalytic Activity of Sn²⁺-doped TiO₂ and Its Loading Effect on Mesoporous Montmorillonite

LI Fang-Fei, YANG Dian-Fan, XIA Mao-Sheng, WANG Yan, JIANG Yin-San

(Key Laboratory of Automobile Materials, Ministry of Education, Department of Material Science and Engineering, Jilin University, Changchun 130025, China)

Received:2010-10-26 Revised:2010-12-16 Published:2011-09-20 Online:2011-08-19
Supported by:
National Natural Science Foundation of China(50574043, 40772028)

摘要/Abstract

摘要： 分别以氯化锡和氯化亚锡为Sn源, 使用溶胶?凝胶法制备出不同掺杂量的Sn-TiO₂, 比较了Sn²⁺与Sn⁴⁺对掺杂后TiO₂可见光催化活性的影响. 实验结果显示, Sn²⁺与Sn⁴⁺均能显著抑制TiO₂晶粒生长, 并促进其晶型转变. 但Sn²⁺-TiO₂的可见光催化活性却明显优于Sn⁴⁺-TiO₂, 这主要是Sn²⁺外层半充满的电子轨道结构引起的. 将可见光催化活性很高的Sn²⁺-TiO₂负载于大比表面积、高稳定性的介孔蒙脱石上, 由于载体与Sn-TiO₂之间发生了相互作用,负载后样品的UV-Vis光谱吸收边相对于Sn-TiO₂发生了显著红移, 且可见光催化活性也有大幅提高.

关键词: Sn-TiO₂, 可见光催化活性, 介孔蒙脱石, 负载

Abstract: Two different tin salts, SnCl₂^.2H₂O and SnCl₄^.5H₂O, were employed in the synthesis of Sn-doped TiO₂. And the crystal structures and visible-light photocatalytic activities between Sn2+-doped TiO₂ and Sn⁴⁺-doped TiO₂ were compared. The results show that both the anatase-to-rutile phase transformation temperature and the crystal growth of TiO₂ are remarkably decreased by Sn dopant, and the Sn²⁺ dopant shows the higher efficiency than Sn⁴⁺ dopant. And despite the similar spectra of XRD and FTIR, Sn²⁺-doped TiO₂displays higher visible-light photocatalytic activities than Sn⁴⁺-doped TiO₂, due to the half-filled d electronic orbit of Sn²⁺. Mesoporous montmorillonite was chosen as the supporting material for Sn²⁺-doped TiO₂, due to its high crystalization and large specific surface area. When Sn²⁺-doped TiO₂ was loaded on mesoporous montmorillonite, the resualtant samples had no significant difference in XRD patterns and FTIR spectra as compared with the supporting material, and no obvious peaks were found related to Sn²⁺-doped TiO₂. While the UV-Vis analysis shows that the adsorption edges of Sn²⁺-doped TiO₂ display red shift after loaded onto mesoporous montmorillonite. As a result, the resultant compound photocatalyst exhibits higher visible-light catalytic activity than unloaded Sn²⁺-doped TiO₂, which is due to the interactions between mesoporous montmorillonite supports and Sn²⁺-doped TiO₂. This might provide a promising way to improve the photocatalytic activity of TiO₂ with minimized cost and widened light-response region.

Key words: Sn-doped TiO₂, visible-light photocatalytic activity, mesoporous montmorillonite, loading

中图分类号:

TQ034

李芳菲, 杨殿范, 夏茂盛, 王岩, 蒋引珊. Sn²⁺-TiO₂的可见光催化活性及其在介孔蒙脱石上的负载[J]. 无机材料学报, 2011, 26(9): 917-922.

LI Fang-Fei, YANG Dian-Fan, XIA Mao-Sheng, WANG Yan, JIANG Yin-San. Visible-light Photocatalytic Activity of Sn²⁺-doped TiO₂ and Its Loading Effect on Mesoporous Montmorillonite[J]. Journal of Inorganic Materials, 2011, 26(9): 917-922.

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Sn²⁺-TiO₂的可见光催化活性及其在介孔蒙脱石上的负载

Visible-light Photocatalytic Activity of Sn²⁺-doped TiO₂ and Its Loading Effect on Mesoporous Montmorillonite

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