Electrochemical synthesis of EuVO4 for the adsorption of U(VI): Performance and mechanism. (June 2021)

• Record Type: Journal Article
• Authors: Lin, Yuling; Liu, Yuhui; Zhang, Shuang; Xie, Zijie; Wang, Yingcai; Liu, Yan; Dai, Ying; Wang, Youquan; Zhang, Zhibin; Liu, Yunhai; Deng, Sheng
• Is Part Of: Chemosphere. Volume 273(2021)
• Publication Date: 2021-06
• Subjects: EuVO4 -- Adsorption -- Molten salt electrolysis -- U(VI) -- Complexation -- Renewable performance; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.128569
• Languages: English
• ISSNs: 0045-6535

Abstract

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 EuVO4 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 EuVO4 is 276.16 mg g −1 . The adsorption mechanism was elucidated with zeta potential and XPS: 1) negatively charged EuVO4 attracted UO2 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 Al 3+, Zn 2+, Cu 2+, Ni 2+, Cr 2+ and Mn 2+, EuVO4 also showed good selective adsorption properties for U(VI). Five adsorption and desorption cycle experiments demonstrated that EuVO4 possessed good renewable performance. Highlights: Different morphologies of EuVO4 were synthesized by high-temperature electrochemical method. U(VI) sorption on EuVO4 was studied using batch and spectroscopies. The maximum adsorption capacity of EuVO4 reached at 276.16 mg g −1 . EuVO4 showed good selective adsorption property for U(Ⅵ) in the multi-ion system.