Highly efficient removal of U(VI) by the photoreduction of SnO2/CdCO3/CdS nanocomposite under visible light irradiation

被引:212
作者
Zhang, Yifeng [1 ]
Zhu, Mingyu [1 ]
Zhang, Shuo [1 ]
Cai, Yawen [1 ]
Lv, Zhimin [1 ]
Fang, Ming [1 ]
Tan, Xiaoli [1 ]
Wang, Xiangke [1 ]
机构
[1] North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China
基金
中国国家自然科学基金;
关键词
Photocorrosion; U(VI); Photoreduction; SnO2/CdCO3/CdS; SITU RAMAN-SPECTROSCOPY; URANIUM-OXIDES; AQUEOUS-SOLUTION; PHOTOCATALYTIC REDUCTION; LUMINESCENCE PROPERTIES; OPTICAL-PROPERTIES; SHELL; TIO2; ADSORPTION; PHOTOCORROSION;
D O I
10.1016/j.apcatb.2020.119390
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Reducing soluble U(VI) to insoluble U(IV) is an ideal strategy to collect/remove uranium in water. In this work, a new way is reported to achieve this reduction through a photocorrosion-related photocatalysis process of SnO2/CdCO3/CdS (SCC) under visible light irradiation. The mechanism is systematically studied and discussed through a variety of characterization methods, such as X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Mott-Schottky test, etc. The matching of energy band ensures the separation of photoelectrons and holes, which results in the decrease of charges' recombination rate and the enhancement of photoreduction activity. The reduction process can be efficiently performed in the ternary complex of SCC in that the photo-generated holes are consumed by oxidization of S2- to S-0 on CdS in SCC. Furthermore, uranium extraction could be achieved by SCC without any protective gases or electronic sacrificial agent, which shows great advantages in applications of U(VI) collection/removal.
引用
收藏
页数:10
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