γ-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation

doi:10.1016/j.scitotenv.2020.141533

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	γ-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation
	Zhao, Caifeng 1,2; Yang, Yahui 1; Luo, Lin 1; Shao, Sai 2; Zhou, Yiji 2; Shao, Ying 2; Zhan, Faqi 3; Yang, Jian 1; Zhou, Yaoyu 1
刊名	Science of the Total Environment
	2020-12-10
卷号	747
关键词	Defects Electron spin resonance spectroscopy Gamma rays Irradiation Light absorption Organic pollutants Oxide minerals Paramagnetic resonance Synthesis (chemical) TiO2 nanoparticles Titanium dioxide Titanium metallography X ray photoelectron spectroscopy Anatase TiO2 nanoparticles Electron paramagnetic resonances (EPR) Gamma-ray irradiation Innovative approaches Organic pollutant degradation Photo catalytic degradation Photoelectrochemical measurements Photoinduced charge carriers
ISSN号	00489697
DOI	10.1016/j.scitotenv.2020.141533
英文摘要	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 γ-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 [rad]O2− 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 ·O2− species. This novel study shows at room temperature, the γ-ray approach of irradiation leads to faster formation and quantification of oxygen vacancies in the semiconductor materials. © 2020
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	Elsevier B.V.
WOS记录号	WOS:000579386300069
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115651]
专题	省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.College of Resources and Environment, Hunan Agricultural University, Changsha; 410128, China; 2.Hunan Institute of Nuclear Agricultural Science and Space Breeding, Hunan Academy of Agricultural Sciences, Changsha; 410125, China; 3.State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhao, Caifeng,Yang, Yahui,Luo, Lin,et al. γ-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation[J]. Science of the Total Environment,2020,747.
APA	Zhao, Caifeng.,Yang, Yahui.,Luo, Lin.,Shao, Sai.,Zhou, Yiji.,...&Zhou, Yaoyu.(2020).γ-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation.Science of the Total Environment,747.
MLA	Zhao, Caifeng,et al."γ-ray induced formation of oxygen vacancies and Ti3+ defects in anatase TiO2 for efficient photocatalytic organic pollutant degradation".Science of the Total Environment 747(2020).