In-situ oxidized tungsten disulfide nanosheets achieve ultrafast photocatalytic extraction of uranium through hydroxyl-mediated binding and reduction  

作　　者：Huanhuan Liu Jia Lei Changyao Gong Ye Li Huimei Chen Jiali Chen Fengchun Wen Dengjiang Fu Yan Liu Wenkun Zhu Rong He 

机构地区：[1]State Key Laboratory of Environment-friendly Energy Materials,National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety,Sichuan Civil-military Integration Institute,Southwest University of Science and Technology,Mianyang 621010,China [2]College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,China

出　　处：《Nano Research》2022年第10期8810-8818,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Nos.21902130,21906154,and 21976147);Sichuan Science and Technology Program(Nos.2022YFG0371,2020JDJQ0060,and 2020JDRC0089);Natural Science Foundation of Anhui province(No.2008085QB81)。

摘　　要：Photoreduction of hexavalent uranium(U(VI))by semiconductor provides a novel and effective avenue for uranium extraction.Unfortunately,the traditional metal oxide and sulfide semiconductors suffer from the lack of confinement sites to U(VI),which resulted in the long period(~1 h)to achieve a high U(VI)extraction efficiency of>90%.Herein,we successfully constructed WS2 nanosheets and created in-situ oxidized domains on the surfaces(O-WS_(2))to promote the uranium extraction and the corresponding removal kinetics.In this system,the O_(7.7-)WS_(2) nanosheets exhibited a considerable U(VI)extraction efficiency of>90%within 20 min in 8 mg·L^(–1) U(VI)-containing solution,which represented the highly efficient U(VI)removal performance.In 200 mg·L^(–1) U(VI)-containing solution,the O7.7-WS2 nanosheets exhibited an extraction capacity of 652.4 mg·g^(-1).The mechanism study revealed that the oxidized surface tended to trap hydrogen atom and in-situ form hydroxyl groups in defect sites.Evidenced by a series of experiment,such as kinetic isotope effect,1H nuclear magnetic resonance(NMR)spectra,and X-ray absorption near-edge structure(XANES)spectra,the in-situ formed hydroxyl groups participated in the uranium reduction,which dramatically enhanced uranium extraction kinetics and efficiency.

关 键 词：in-situ oxidization WS_(2)nanosheets hydroxyl groups URANIUM photoreduction ABSTRACT 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O644.1[理学—物理化学]