Visible light driven Ti3+ self-doped TiO2 for adsorption-photocatalysis of aqueous U(VI)

被引：116
作者：
Wang, Jingjing [1 ,2 ,3 ]
Wang, Yun [2 ,3 ]
Wang, Wei [2 ,3 ]
Peng, Tong [1 ,4 ]
Liang, Jianjun [2 ,3 ]
Li, Ping [2 ,3 ]
Pan, Duoqiang [1 ]
Fan, Qiaohui [2 ,3 ]
Wu, Wangsuo [1 ]
机构：
[1] Lanzhou Univ, Sch Nucl Sci & Technol, Radiochem Lab, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
[3] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
[4] East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China
来源：
ENVIRONMENTAL POLLUTION | 2020年 / 262卷
基金：
中国国家自然科学基金;
关键词：
TiO2; Ti3+; Self-doping; Photoreduction; U(VI); URANYL IONS; RUTILE TIO2; URANIUM; REDUCTION; REMOVAL; ABSORPTION; TEMPERATURE; PERFORMANCE; EXTRACTION; STRATEGY;
D O I：
10.1016/j.envpol.2020.114373
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The photocatalytic reduction of U(VI) is recognized as an economical and effective way for U(VI) removal/recovery from solutions. To improve the photocatalytic activity of TiO2 under visible light, TiO2 was hydrogenated by NaBH4 to generate Ti3+ self-doped black TiO2 (BTn). The self-doped Ti3+ alongside oxygen vacancies (Ov) could act as interband level to increase visible light capture and reduce the recombination of photogenerated carriers. The obtained BTn samples showed high performance for U(VI) elimination under near neutral conditions, and held an outstanding anti-interference for U(VI) over competing metal cations and anions. Methanol and ethanol could act as sacrificial donors, being favorable for the photocatalytic reduction of U(VI), while the presence of EDTA inhibited the photoreduction of U(VI). The BTn photocatalysts showed relatively high stability and reusability during the photocatalysis and elution processes. The XPS, TEM and XRD results revealed that U(VI) was photo-reduced to form UO2 on the surface of BTn. This work may serve as an important reference for improving the photocatalytic reactivity of TiO2 as well as for the efficient removal/recovery of U(VI) from aqueous solutions. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：11
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