Journal
CHEMICAL ENGINEERING JOURNAL
Volume 400, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125944
Keywords
Gd3+ doping; BiOBr microspheres; CO2 reduction; Active species; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21922811, 51702284, 21878270, 21961160742, 21667019]
- Key Project of Natural Science Foundation of Jiangxi Province [20171ACB20016]
- Jiangxi Province Major Academic and Technical Leaders Cultivating Object Program [20172BCB22014]
- Science and Technology Department of Jiangxi Province [20181BCB18003, 20181ACG70025]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, CSA [PCOM201906]
- Key Project of Science and Technology Research of the Jiangxi Provincial Department of Education [DA201602063]
- Aviation Science Foundation of China [2017ZF56020]
- Fujian Key Laboratory of Measurement and Control System for of Shore Environment [S1KF1703]
- Zhejiang Provincial Natural Science Foundation of China [LR19B060002]
- Fundamental Research Funds for the Central Universities
- Startup Foundation for Hundred-Talent Program of Zhejiang University
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Rising carbon dioxide (CO2) levels in the atmospheric environment is a key cause of global warming. To reduce the concentration of CO2 in the atmosphere, converting CO2 into hydrocarbon fuels is an eye-catching strategy. Herein, we achieve in-situ doping of Gd3+ for BiOBr microspheres consisting of nanosheets via a simple hydrothermal method. The resulting Gd doped BiOBr structure (BiOBr/Gd) exhibits considerable improvement on photocatalytic activities for CO2 reduction. Compared to bare BiOBr (24.097 mu mol g(-1) for 3 h), the BiOBr/Gd-0.05 displays excellent performance of CO2 photoreduction with nearly five-fold increase in the rate of methanol emission (123.711 mu mol g(-1) for 3 h). The enhanced CO2 reduction activities of BiOBr/Gd-0.05 are attributed to the mechanism that Gd3+ ions are introduced into the lattice of BiOBr to broaden the visible light response. Furthermore, we discuss the mechanism of photocatalytic CO2 reduction, where holes are the main active species in the process of CO2 reduction.
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