gamma-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation
文献类型： 外文期刊
第一作者： Zhao, Caifeng
作者： Zhao, Caifeng;Yang, Yahui;Luo, Lin;Yang, Jian;Zhou, Yaoyu;Zhao, Caifeng;Shao, Sai;Zhou, Yiji;Shao, Ying;Zhan, Faqi
作者机构：
关键词： Oxygen vacancies; Gamma-ray irradiation; Anatase TiO2; Ti3+ defects; Organic pollutant degradation
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）
ISSN： 0048-9697
年卷期： 2020 年 747 卷
页码：
收录情况： SCI
摘要： Oxygen vacancies and Ti3+ defects in anatase TiO2 have attracted great attention to address the insufficient optical absorption and photoinduced charge-carrier separation in photocatalysis. In this study, we demonstrate a superficial and innovative approach for synthesizing anatase TiO2 nanoparticles with abundant oxygen vacancies via.-ray irradiation reduction at room temperature. X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) confirm that oxygen vacancies and Ti3+ defects can be quantitatively and extensively obtained by merely regulating the irradiation dosage. Photoelectrochemical measurements suggest that oxygen vacancies and Ti3+ defects promoted the separation of electron-hole pairs and then enhanced the photocatalytic degradation performance for organic pollutant. In comparison with TiO2 (no irradiation), the sample (49.5 kGy irradiation) exhibited a 20.0-fold enhancement in visible-light decomposition of phenol. In addition, the results of scavenge experiments and mechanism analysis revealed that center dot O-2(-) are the dominant active species. The excited electrons generated at the conduction band and oxygen vacancy level of TiO2-x-49.5 conspicuously contributes to generate much more center dot O-2(-) species. This novel study shows at room temperature, the gamma-ray approach of irradiation leads to faster formation and quantification of oxygen vacancies in the semiconductor materials. (C) 2020 Published by Elsevier B.V.
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