无机化学学报

原位稀土修饰Bi₂MoO₆高效可见光催化剂

In Situ Rare-Earth Doped Bi₂MoO₆ Visible Light Photocatalyst with Enhanced Activity

作者	单位	E-mail
缪应纯	华东师范大学化学系, 上海 200062 曲靖师范学院化学化工学院, 曲靖 650011
潘改芳	上海师范大学教育部资源化学重点实验室, 上海市稀土功能材料重点实验室, 上海 200234
霍宇凝	上海师范大学教育部资源化学重点实验室, 上海市稀土功能材料重点实验室, 上海 200234	Huoyuning@shnu.edu.cn
李和兴	华东师范大学化学系, 上海 200062 上海师范大学教育部资源化学重点实验室, 上海市稀土功能材料重点实验室, 上海 200234	Hexing-li@shnu.edu.cn

摘要: 采用原位法制备了系列稀土离子修饰的Bi₂MoO₆可见光催化剂并应用于罗丹明B的光催化降解，HPLC-MS显示该反应经脱除乙基的过程形成5个中间产物，最后完全矿化。研究表明，Gd³⁺修饰效果最佳，且原位法优于浸渍法，主要归因于Gd³⁺进入Bi₂MoO₆晶格，形成施主能级，导致能级带隙变窄，不仅有利于可见光活化光催化剂，而且阻碍电子-空穴复合并抑制修饰剂流失，从而提高光催化活性和稳定性。

关键词: 稀土 Bi₂MoO₆ 光解非均相催化合成设计有机污染物降解

基金项目: 国家自然科学基金（No.21261140333，21237003，21207091），上海市自然科学基金（No.12230706000，11JC1409000，12YZ091）资助项目。

Abstract: γ-Bi₂MoO₆ doped with rare earth is expected to promote the photo-induced electron-hole separation and also enhance stability. Herein, we report a series of Bi₂MoO₆ visible light photocatalysts doped with various rare-earths and used for photocatalytic degradation of RhB via in-situ synthesis. The HPLC-MS results reveal that this reaction begins with de-ethylation process and then is followed by formation of 5 intermediates before finally mineralizing into CO₂. The Gd³⁺-modification is superior over other rare-earth and the in-situ synthesis is better than traditional impregnation method since the Gd³⁺ is incorporated into the Bi₂MoO₆ crystal lattice to form donor level, which facilitates photocatalyst activation by visible lights, retards the photo-induced electron-hole recombination, and inhibits the leaching of dopants, leading to an enhanced activity and stability.

Keywords: rare earths photolysis heterogeneous catalysis Bi₂MoO₆ synthetic design degradation of organic pollutant

投稿时间：2014-02-10 修订日期：2014-03-19

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缪应纯,潘改芳,霍宇凝,李和兴.原位稀土修饰Bi₂MoO₆高效可见光催化剂[J].无机化学学报,2014,30(7):1587-1592.

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