Oxygen-vacancy generation in MgFe2O4 by high temperature calcination and its improved photocatalytic activity for CO2 reduction

被引:53
|
作者
Fu, Liming [1 ]
Chen, Haowen [1 ]
Wang, Kang [2 ]
Wang, Xitao [1 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin Key Lab Appl Catalysis Sci & Technol, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Chem Engn & Technol, Chem Engn Res Ctr, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
MgFe2O4; Oxygen vacancy generation; Calcination temperature; Photocatalytic CO2 reduction; CO and H-2; VISIBLE-LIGHT; CATALYTIC PERFORMANCE; MAGNETIC-PROPERTIES; FACILE SYNTHESIS; HETEROJUNCTION; NANOPARTICLES; CONVERSION; FUELS; WATER; CH4;
D O I
10.1016/j.jallcom.2021.161925
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
MgFe2O4 spinel with abundant oxygen vacancy was synthesized by a simple precipitation method, and tested in photocatalytic reduction of CO2 with water vapor as reductant. A series of characterization including XRD, XPS, EPR, PL spectrum, UV-vis DRS and TPD-CO2 were performed to investigate the influence of calcination temperature on morphology, optical and electronic properties of MgFe2O4 spinel. The results demonstrated that the oxygen vacancy concentration increases first and then decreases with the increase of calcination temperature. By introducing oxygen vacancies, the recombination of photogenerated electron-hole pairs was significantly suppressed, visible light absorption and chemisorption capacity of CO2 were dramatically boosted. Mg-Fe-750 with the richest oxygen vacancies exhibits the highest photocatalytic activity, for which the production rate of CO and H-2 was 24.4 and 34.3 mu mol/gcat/h, respectively. (C) 2021 Elsevier B.V. All rights reserved.
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页数:9
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