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Roles of photo-generated holes and oxygen vacancies in enhancing photocatalytic performance over CeO2 prepared by molten salt method
Advanced Powder Technology ( IF 4.2 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.apt.2020.08.017
Chen Yang , Jian Yang , Xu Duan , Guang Hu , Qingcai Liu , Shan Ren , Jiangling Li , Ming Kong

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 °C for degradation of MO was about 3.4 times higher than CeO2 prepared at 500 °C. CeO2 prepared at 800 °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.



中文翻译:

光生空穴和氧空位对增强熔融盐法制备的CeO 2的光催化性能的作用

通过熔融盐法合成了一系列CeO 2光催化剂。通过甲基橙(MO)的降解评估了光催化活性。进行了系统表征,包括X射线衍射,扫描电子显微镜,傅立叶变换红外光谱,X射线光电子能谱,拉曼光谱,电子自旋共振光谱,紫外可见漫反射光谱,光致发光光谱,光电流响应和电化学阻抗光谱。研究所制备的CeO 2样品。发现在紫外线照射下,在800℃下制备的用于降解MO的CeO 2的表观速率常数比CeO 2高约3.4倍。在500°C下制备。在800°C下制备的CeO 2保持较高的氧空位浓度。根据诱捕实验,证明光生空穴在该光催化体系中起主要作用。此外,提出了可能的光催化机理,该机理表明了光生空穴和氧空位的作用。

更新日期:2020-10-15
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