Self-assembly of active Bi2O3/TiO2 visible photocatalyst with ordered mesoporous structure and highly crystallized anatase
Self-assembly of active Bi2O3/TiO2 visible photocatalyst with ordered mesoporous structure and highly crystallized anatase
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DOI：
10.1021/jp800324t
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发表时间：
2008-04-24
影响因子：
3.7
通讯作者：
Li, Hexing
中科院分区：
文献类型：
--
作者：
Bian, Zhenfeng;Zhu, Jian;Li, Hexing
采用ab蒸发诱导自组装法合成了具有有序介孔结构的Bi 2 O3/TiO 2纳米晶。在可见光（λ> 420 nm）下，该催化剂对氯苯酚的液相光催化降解表现出较高的活性，这是由于Bi 2 O3的光敏化作用和独特的结构特征的协同作用。Bi_2O_3/TiO_2光催化剂的光敏化作用使其光谱响应范围从紫外扩展到可见光区，使其易于被可见光激活。有序的介孔孔道有利于反应物分子的扩散。同时，高比表面积可以增强Bi 2 O3的分散、光捕获和反应物吸附。此外，高度结晶化的ZnO可以促进光电子从本体到表面的转移，从而抑制它们与光空穴的复合，导致增强的量子效率。
Bi2O3/TiO2 nanocrystallines with ordered mesoporous structure are synthesized by ab evaporation-induced self-assembly method. During liquid-phase photocatalytic degradation of p-chlorophenol under visible illumination (lambda > 420 nm), this catalyst exhibits high activity owing to the synergetic effects of both the Bi2O3-photosensitization and the unique structural characteristics. The Bi2O3-photosensitization of TiO2 could extend the spectral response from UV to visible area, making the Bi2O3/TiO2 photocatalyst easily activated by 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 surface and thus inhibit their recombination with photoholes, leading to enhanced quantum efficiency.