期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 423, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126935
关键词
Uranium; Fe doping; Photoreduction; Cation vacancies; TiO2
资金
- National Natural Science Foundation of China [21902130, 21976147]
- Sichuan Science and Technology Program [2019YFN0125, 2019ZDZX0027, 2020YFG0456, 2020YFG0147,, 2020YFG0160, 2020YFG0191, 2020YFQ0014, 2020YFS0345, 2019YFG0514, 2019ZDZX0013, 2020JDJQ0060, 2020YFG0467, 2020JDRC0099, 2020ZDZX0012, 2020JDRC0089]
- Sichuan's Training Program of Innovation and Entrepreneurship [S201910619101, S202010619038, S202010619056]
- Project of State Key Laboratory of Environment-friendly Energy Materials in SWUST [18fksy0218]
- Research Fund of SWUST [18zx7149, 19zx7129]
The introduction of Ti vacancies and doped Fe atoms into 4%Fe-Ti1-xO2 nanosheets improves the utilization of visible light and decreases the recombination of photogenerated electron-hole pairs, contributing to the highly efficient removal of U(VI).
The reduction of U(VI) to U(IV) in wastewater by semiconductor photocatalysis has become a new highly efficient and low-cost method for U(VI) removal. However, due to the weak absorption of visible light led by wide band gap and low carrier utilization rate resulted from the severe electron-holes recombination, the photoreduction performance of U(VI) is limited. Herein, the Ti vacancies and doped Fe atoms were simultaneously introduced into TiO2 nanosheet (labeled as 4%Fe-Ti1-xO2) as a highly active and stable catalysis for U(VI) photoreduction. Without adding any hole sacrifice agent, 4%Fe-Ti1-xO2 nanosheets achieved 99.7% removal efficiency for U(VI) within 120 min. And the 92.1% removal efficiency of U(VI) via 4%Fe-Ti1-xO2 nanosheets was still maintained after 5 cycles. Moreover, 4%Fe-Ti1-xO2 exhibited dramatic removal rate, 81.6% U(VI) in the solution was removed in 10 min. Further study on the mechanism showed that simultaneously introducing the Ti vacancies and doped Fe atoms in 4%Fe-Ti1-xO2 nanosheets improved the visible light utilization and decreased the recombination of photogenerated electron-hole pairs, contributing to the highly efficiency removal of U(VI).
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