1. Electrochemical synthesis of EuVO4 for the adsorption of U(VI): Performance and mechanism.
- Author
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Lin, Yuling, Liu, Yuhui, Zhang, Shuang, Xie, Zijie, Wang, Yingcai, Liu, Yan, Dai, Ying, Wang, Youquan, Zhang, Zhibin, Liu, Yunhai, and Deng, Sheng
- Subjects
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URANIUM , *URANIUM compounds , *RARE earths , *ADSORPTION , *ADSORPTION capacity , *PROBLEM solving , *IONIC strength - Abstract
The efficient removal of uranium from aqueous solution remains of great challenge in securing water environment safety. In this paper, we reported a high temperature electrochemical method for the preparation of EuVO 4 with different morphologies from rare earth oxides and vanadate, which solved the problems of rare earth and vanadium recovery. The effects of pH, ionic strength, contact time, initial concentration and reaction temperature on the adsorption of U(VI) by prepared adsorbent were studied by static batch experiments. When the concentration of U(VI) standard is 100 mg g−1, the maximum adsorption capacity of EuVO 4 is 276.16 mg g−1. The adsorption mechanism was elucidated with zeta potential and XPS: 1) negatively charged EuVO 4 attracted UO 2 2+ by electrostatic attraction; 2) exposed Eu, V, and O atoms complexed with U(VI) through coordination; 3) the hybrid of Eu was complex, which accommodated different electrons to interact. In the multi-ion system with Al3+, Zn2+, Cu2+, Ni2+, Cr2+ and Mn2+, EuVO 4 also showed good selective adsorption properties for U(VI). Five adsorption and desorption cycle experiments demonstrated that EuVO 4 possessed good renewable performance. • Different morphologies of EuVO 4 were synthesized by high-temperature electrochemical method. • U(VI) sorption on EuVO 4 was studied using batch and spectroscopies. • The maximum adsorption capacity of EuVO 4 reached at 276.16 mg g−1. • EuVO 4 showed good selective adsorption property for U(Ⅵ) in the multi-ion system. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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