Si掺杂TiO2催化剂的结构与可见光催化活性研究

doi:10.7517/j.issn.1674-0475.2013.04.006

影像科学与光化学 ›› 2013, Vol. 31 ›› Issue (4): 295-304.DOI: 10.7517/j.issn.1674-0475.2013.04.006

Si掺杂TiO₂催化剂的结构与可见光催化活性研究

张鹏^1,2, 于彦龙^1,2, 匡元江^1,2, 姚江宏^1,2, 曹亚安^1,2

1. 南开大学物理科学学院, 天津 300071;
2. 南开大学泰达应用物理学院弱光非线性光子学教育部重点实验室, 天津 300457

收稿日期:2013-02-25 修回日期:2013-04-22 出版日期:2013-07-15 发布日期:2013-07-15
通讯作者: 曹亚安,E-mail: caoyaan@yahoo.com.
作者简介:张鹏(1981- ),从事功能材料的研究
基金资助:
国家自然科学基金(51072082, 21173121, 11074129); 国家重点基础研究发展规划项目(973)(2012CB934201).

Structure and Photocatalytic Activity of Silicon Doped TiO₂ Photocatalysts Under Visible Light

ZHANG Peng^1,2, YU Yan-long^1,2, KUANG Yuan-jiang^1,2, YAO Jiang-hong^1,2, CAO Ya-an^1,2

1. College of Physics, Nankai University, Tianjin 300071, P. R. China;
2. The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, Applied Physics School, Teda College, Nankai University, Tianjin 300457, P. R. China

Received:2013-02-25 Revised:2013-04-22 Online:2013-07-15 Published:2013-07-15

摘要/Abstract

摘要：

采用溶胶-凝胶法制备出Si⁴⁺离子掺杂的TiO₂可见光催化剂 (TiO₂-xSi),该催化剂的可见光催化活性高于纯TiO₂和N掺杂的TiO₂(TiO₂-N).利用XRD、XPS、FT-IR和UV-Vis DRS等表征技术,研究了TiO₂-xSi催化剂的晶体结构、能带结构和表面性质.研究发现:掺入Si⁴⁺离子在TiO₂粒子表面主要形成Ti—O—Si结构,并在导带下0.2—0.6 eV区域形成表面态能级,该表面态能级的存在是催化剂产生可见光响应、实现可见光催化的根本原因.另外,讨论了Si⁴⁺离子的掺杂对金红石相和晶粒的生长抑制作用,以及催化剂的比表面积和表面羟基物种增加对可见光催化活性的影响.

关键词: TiO₂, Si⁴⁺离子掺杂, 可见光响应, 可见光催化活性

Abstract:

TiO₂ photocatalysts (TiO₂-xSi) doped by different contents of silicon were prepared by a sol-gel method. The catalysts exhibited a higher photocatalytic ability than the pure TiO₂ and N-doped TiO₂(TiO₂-N). The samples were characterized by XRD, XPS, FT-IR and UV-Vis diffuse reflectance absorption spectra. It was revealed that the doped silicon ions formed Si—O—Ti structures on the surface of TiO₂ particles. And thus, surface state energy attributed to the silicon dopant was located at 0.2—0.6 eV below the conduction band of TiO₂, which enhanced the response to the visible light and photocatalytic ability. It was discussed the suppression to the formation of rutile phase and the growth of titanium dioxide crystals because of the doped silica in TiO₂ particles and the effect of catalysts' surface area and surface species such as hydroxyl to the photocatalytic activity.

Key words: TiO₂, Si doping, visible light response, visible light photocatalytic

中图分类号:

张鹏, 于彦龙, 匡元江, 姚江宏, 曹亚安. Si掺杂TiO₂催化剂的结构与可见光催化活性研究[J]. 影像科学与光化学, 2013, 31(4): 295-304.

ZHANG Peng, YU Yan-long, KUANG Yuan-jiang, YAO Jiang-hong, CAO Ya-an. Structure and Photocatalytic Activity of Silicon Doped TiO₂ Photocatalysts Under Visible Light[J]. Imaging Science and Photochemistry, 2013, 31(4): 295-304.

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Si掺杂TiO₂催化剂的结构与可见光催化活性研究

Structure and Photocatalytic Activity of Silicon Doped TiO₂ Photocatalysts Under Visible Light

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