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。
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 photoeatalysts 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 Gd^3＋-modifieation is superior over other rare-earth and the in-situ synthesis is better than traditional impregnation method since the Gd^3＋ 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.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第7期1587-1592,共6页
Chinese Journal of Inorganic Chemistry
基金
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
关键词
稀土
Bi2MoO6
光解
非均相催化
合成设计
有机污染物降解
rare earths
photolysis
heterogeneous catalysis
Bi2MoO6
synthetic design
degradation of organic pollutant
