Construction of CeO2/BiOI S-scheme heterojunction for photocatalytic removal of elemental mercury

被引:97
|
作者
Xiao, Yixuan [1 ]
Ji, Zheng [3 ]
Zou, Chan [1 ]
Xu, Yiqing [1 ]
Wang, Run [1 ]
Wu, Jiang [1 ,2 ]
Liu, Guolong [1 ]
He, Ping [1 ]
Wang, Qiang [4 ]
Jia, Tao [1 ]
机构
[1] Shanghai Univ Elect Power, Coll Energy & Mech Engn, Shanghai 200090, Peoples R China
[2] Shanghai Inst Pollut Control & Ecol Secur, Shanghai, Peoples R China
[3] Nanjing Sac Valmet Automat Co Ltd, Nanjing 210031, Peoples R China
[4] Beijing Forest Univ, Coll Environm Sci & Engn, Beijing 100083, Peoples R China
基金
上海市自然科学基金; 中国国家自然科学基金;
关键词
Ce4+; Ce3+redox centers; S-scheme heterojunction; CeO2; BiOI; Photocatalysis; Oxygen vacancies; FACILE SYNTHESIS; OXIDATION; MECHANISM; CEO2; NANOSHEETS; PHOTODEGRADATION; HETEROSTRUCTURE; HG-0; GAS;
D O I
10.1016/j.apsusc.2021.149767
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, a series of CeO2/BiOI S-scheme heterojunction photocatalysts were prepared through a simple coprecipitation and hydrothermal method. In addition, various characterization methods were adopted to confirm the successful preparation of the photocatalyst, and density functional theory (DFT) was applied to evaluate and calculate the band structure, density of states and electrostatic potential, and to further determine the construction of the S-scheme heterojunction. Furthermore, photocatalytic activity of the samples was evaluated by removing Hg0 under visible light, and the mechanism of photocatalytic mercury removal was proposed. The experimental results show that compared with single CeO2 and BiOI, the photocatalytic activity of the prepared CeO2/BiOI S-structure heterojunction has been significantly improved. Moreover, the significant enhancement of photocatalytic activity not only benefits from Ce4+/Ce3+ activation centers and oxygen vacancies, but also from the S-scheme heterojunction. This work provides effective guidance for exploring the effective construction of Bibased composite photocatalysts with S-scheme heterojunctions.
引用
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页数:14
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