期刊
ADVANCED POWDER TECHNOLOGY
卷 31, 期 9, 页码 4072-4081出版社
ELSEVIER
DOI: 10.1016/j.apt.2020.08.017
关键词
CeO2; Photo-generated holes; Oxygen vacancies; Photocatalytic mechanism
资金
- National Natural Science Foundation of China [51974049, 51904045]
- Key Technology Innovation Projects of Key Industries in Chongqing [cstc2016zdcy-ztzx0020-03]
- China Postdoctoral Science Foundation [2019M663436]
- Chongqing Postdoctoral Science Foundation [cstc2019jcyj-bshX0011]
A series of CeO2 photocatalysts were synthesized through the molten salt method. The photocatalytic activity was evaluated through the degradation of methyl orange (MO). Systematic characterizations including X-ray diffraction, Scanning electron microscopy, Fourier transformed infrared, X-ray photoelectron spectroscopy, Raman spectroscopy, electron spin-resonance spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectrometry, photocurrent response and electrochemical impedance spectroscopy were conducted to study the as-prepared CeO2 samples. It was found that, under ultraviolet light irradiation, the apparent rate constants of CeO2 prepared at 800 degrees C for degradation of MO was about 3.4 times higher than CeO2 prepared at 500 degrees C. CeO2 prepared at 800 degrees C held the higher oxygen vacancies concentration. According to the trapping experiments, it was demonstrated that photo-generated holes played a dominant role in this photocatalytic system. Furthermore, the possible photocatalytic mechanism which showed the roles of photo-generated holes and oxygen vacancies was proposed. (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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