期刊
CHEMICAL ENGINEERING JOURNAL
卷 366, 期 -, 页码 504-513出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.038
关键词
BiVO4; Photocatalytic decomposition; N2O; DFT plus U
资金
- National Natural Science Foundation of China [21673290, U1662103]
- Beijing National Natural Science Foundation [2182060]
A series of BiVO4 semiconductor photocatalysts with different crystallographic forms and crystallite sizes are designed and controllably constructed by a facile hydrothermal method, and their photocatalytic activities are examined for N2O decomposition. It is found that monoclinic BiVO4 prepared at 150 degrees C shows the highest activity because of its strongest adsorption ability for visible light and highest separation efficiency for photogenerated charge carriers, which achieves 26.7% N2O conversion at 25 degrees C after 12 h of irradiation. Oxygen vacancy significantly influences the photocatalytic performance of N2O decomposition, which can not only promote the formation of excess electrons but also reduce the activation energy barrier. Moreover, DFT+ U calculation is employed to explore the electronic properties of the catalyst at the microscopic level, as well as the reaction pathway of N2O decomposition over these photocatalysts, is illustrated.
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