Harmonizing the energy band between adsorbent and semiconductor enables efficient uranium extraction

被引：28
作者：
Chen, Tao [1 ]
Li, Mingxin [1 ]
Zhou, Li [1 ]
Feng, Xuanrui [1 ]
Lin, Dajun [1 ]
Ding, Xiaobo [1 ]
Li, Chen [2 ]
Yan, Ren [2 ]
Duan, Tao [1 ]
He, Rong [1 ]
Zhu, Wenkun [1 ]
机构：
[1] Southwest Univ Sci & Technol, Joint Lab Extreme Condit Matter Properties,Nucl W, Sch Life Sci & Engn,Sichuan Inst Mil & Civilian I, State Key Lab Environm Friendly Energy Mat,Natl C, Mianyang 621010, Sichuan, Peoples R China
[2] Arch Sci & Technol Res Achievements Sichuan Prov, Chengdu 610016, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2021年 / 420卷
关键词：
Molybdenum disulfide; Reduced graphene oxide; Extraction; Uranium; Photoreduction; AQUEOUS-SOLUTION; GRAPHENE-OXIDE; PHOTOCATALYTIC REDUCTION; REMOVAL; U(VI); ELIMINATION; ADSORPTION; STRATEGY; G-C3N4;
D O I：
10.1016/j.cej.2020.127645
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Herein, we harmonized the energy band of defective molybdenum disulfide (MoSx) and reduced graphene oxide (RGO) through manipulating the concentration of S vacancies for efficient U(VI) reduction. The analysis of band structure revealed that the EF and conduction band of MoSx downward shifted with the increase of S vacancies, which lowered the schottky barrier but simultaneous decreased the reducibility of photogenerated electrons. Accordingly, the removal rate of U(VI) under the irradiation of simulated sunlight exhibited a volcanic relationship with the concentration of S vacancies in MoSx/RGO. Specifically, the maximum removal rate reached 91.6% with nearly 83.4% of tetrahydrated uranium (U(IV)) species over MoSx/RGO heterojunction. In addition, the extraction efficiency of MoSx/RGO heterojunction kept steady in 5-cycle test and exhibited less than 4.5% decrease in the presence of non-redox-active competing metal cations.
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页数：9
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