Self-Assembly of Active Bi2O3/TiO2 Visible Photocatalyst with Ordered Mesoporous Structure and Highly Crystallized Anatase
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- 作者：Zhenfeng Bian ; Jian Zhu ; Shaohua Wang ; Yong Cao ; Xufang Qian ; Hexing Li
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：April 24, 2008
- 年：2008
- 卷：112
- 期：16
- 页码：6258 - 6262
- 全文大小：201K
- 年卷期：v.112,no.16(April 24, 2008)
- ISSN：1932-7455
文摘
Bi2O3/TiO2 nanocrystallines with ordered mesoporous structure are synthesized by ab evaporation-inducedself-assembly method. During liquid-phase photocatalytic degradation of p-chlorophenol under visibleillumination (
> 420 nm), this catalyst exhibits high activity owing to the synergetic effects of both theBi2O3-photosensitization and the unique structural characteristics. The Bi2O3-photosensitization of TiO2 couldextend the spectral response from UV to visible area, making the Bi2O3/TiO2 photocatalyst easily activatedby visible lights. The ordered mesoporous channels facilitate the diffusion of reactant molecules. Meanwhile,the high surface area could enhance the Bi2O3 dispersion, the light harvesting, and the reactant adsorption.Furthermore, the highly crystallized anatase may promote the transfer of photoelectrons from bulk to surfaceand thus inhibit their recombination with photoholes, leading to enhanced quantum efficiency.
> 420 nm), this catalyst exhibits high activity owing to the synergetic effects of both theBi2O3-photosensitization and the unique structural characteristics. The Bi2O3-photosensitization of TiO2 couldextend the spectral response from UV to visible area, making the Bi2O3/TiO2 photocatalyst easily activatedby visible lights. The ordered mesoporous channels facilitate the diffusion of reactant molecules. Meanwhile,the high surface area could enhance the Bi2O3 dispersion, the light harvesting, and the reactant adsorption.Furthermore, the highly crystallized anatase may promote the transfer of photoelectrons from bulk to surfaceand thus inhibit their recombination with photoholes, leading to enhanced quantum efficiency.