文献类型：期刊文献

英文题名：Rapid and selective uranium extraction from aqueous solution under visible light in the absence of solid photocatalyst

作者：Li, Shaojun[1,2];Hu, Yezi[1];Shen, Zewen[1];Cai, Yawen[1];Ji, Zhuoyu[1];Tan, Xiaoli[1];Liu, Zhixin[2];Zhao, Guixia[1];Hu, Shuxian[3];Wang, Xiangke[1,2]

机构：[1]North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Shaoxing 312000, Peoples R China;[3]Univ Sci & Technol Beijing, Dept Phys, Beijing 100083, Peoples R China

年份：2021

卷号：64

期号：8

起止页码：1323

外文期刊名：SCIENCE CHINA-CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000664839700002)、、EI(收录号：20212610563243)、Scopus(收录号：2-s2.0-85105321339)、WOS

基金：This work was supported by the National Natural Science Foundation of China (21976054, 21976014, U1930402), the National Key Research and Development Program of China (2017YFA0207002), the Science Challenge Project (TZ2016004), and the Fundamental Research Funds for the Central Universities (2020MS036). The authors thank the generous computer time from TianHe2-JK Supercomputer Center.

语种：英文

外文关键词：uranyl removal; solidification; photoreduction; visible light; selective extraction

外文摘要：Extraction of uranium from radioactive waste-water is of significant importance for environmental protection and the recovery of uranium resource. Different from the previous reports to use the solid absorbent/photocatalyst for U(VI) removal, herein, we proposed a new eco-friendly method for the rapid and selective extraction of uranium from aqueous solutions under visible light without solid materials. At optimal pH value and in the presence of organics like alcohols, the U(VI) could be extracted efficiently to form brown uranium solid over wide uranium concentrations under anaerobic condition and visible light, by utilizing the excitation of the given U(VI) species. With comprehensive modelling of the electronic ultraviolet-visible (UV-Vis) properties, it is proved that pH adjusting towards U(VI) could induce efficient ligand-to-metal-charge-transfer (LMCT) within the uranyl complex under visible light and the reduction of U(VI) to form U(V), which can be transformed into U(IV) via disproportionation reaction. The resulted U(IV) in solid phase makes the extraction much more convenient in operation. More importantly, the excellent selectivity for uranium extraction over interfering alkali metal ions, transition metal ions and the lanthanide metal ions show a powerful application potential.