期刊
CHEMICAL ENGINEERING JOURNAL
卷 406, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126791
关键词
Molybdenum disulfide; Bacterial cellulose; Schottky junction; S-vacancy; Uranium; Photoreduction
资金
- NSFC [21601147, 21902130, 21976147]
- Sichuan Science and Technology Program [2019JDRC0118, 2019YFN0125, 2019YFS0469, 2019YFS0503, 2019YFS0461, 2019YFG0433, 2019GFW191, 2019ZDZX0027, 2019YFG0434, 2019YFG0514, 2019ZDZX0013, 2020JDRC0099, 2020JDRC0089]
- Education Department of Sichuan Province [17zd1131, 18ZA0494]
- Sichuan's Training Program of Innovation and Entrepreneurship for Undergraduate [S201910619101]
- Plan Projects of Mianyang Science and Technology [2018YFZJ003]
- Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory [18kfhk03]
- Project of State Key Laboratory of Environment-friendly Energy Materials in SWUST [18fksy0218]
- Research fund of SWUST for PhD [18zx7149, 19zx7129]
- Longshan Academic Talent Research Supporting Program of SWUST [17LZX526, 18LZXT04, 18LZX420]
- Postgraduate Innovation Fund Project by SWUST [19ycx0036]
Integration of schottky junction and defect engineering on adsorbent-semiconductors offers a promising strategy for photocatalytic reduction of U(VI). The BC-MoS2-x heterojunction exhibited high removal efficiency, cycle stability, and selective U(VI) removal in the presence of competing metal cations. The use of organic matter as a hole trapping agent to enhance U(VI) removal efficiency may pave the way for the development of rationally designed heterojunction photocatalysts.
Integration of the schottky junction and defect engineering over the adsorbent-semiconductors is a perspective strategy for the photocatalytic reduction of hexavalent uranium (U(VI)), which not only effectively avoid the limited active sites on semiconductors, but also promote photogenerated electrons are transferred to the adsorbent through the schottky junction. Here, we developed a bacterial cellulose-defective molybdenum disulfide (BC-MoS2-x) heterojunction by integrating schottky junction and sulfur vacancy (S-vacancy), targeting at simultaneous selective U(VI) removal. The carbonized BC served as not only a confined framework for the growing of MoS2, but also an ideal electron acceptor and transporter for improving the charge carrier separation efficiency. Specifically, the Schottky Junction and S-vacancy had been proven to effectively synergistically enhance the photoelectrons transfer from MoS2 to carbonized BC. Accordingly, the BC-MoS2-x heterojunction presented high removal efficiency for U(VI) with a removal rate of up to 91% in a wide range of U(VI) concentrations. The BC-MoS2-x heterojunction possessed excellent cycle stability in multiple U(VI) capture test cycles, and exhibited a highly selective U(VI) removal in the system containing an abundant of non-redox-active competing metal cations. Interestingly, organic matter, as an unfavorable factor for U(VI) removal in the traditional radioactive wastewater, had been proven to be used as the hole trapping agent to improve the U(VI) removal efficiency. This strategy may open a paradigm for the development of rationally designed heterojunctions as the photocatalysts for selective U(VI) removal.
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