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Zhang S, Yang F, Cao X, Tang Y, Yin T, Bo T, Liu Y, Lisak G, Kano N, Na B, Chang M, Liu Y. Enhanced uranium separation by charge enabling γ-MnO 2 with oxygen vacancies. J Hazard Mater 2023; 459:132112. [PMID: 37494797 DOI: 10.1016/j.jhazmat.2023.132112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 07/11/2023] [Accepted: 07/19/2023] [Indexed: 07/28/2023]
Abstract
Numerous efforts have been devoted to understanding the electron transfer process of uranium (UO22+) on adsorbent materials, whereas the potential oxygen vacancies (OVs) in metal oxides have long been overlooked. Once these interactions are taken into account, the emerging molecular orbital effects undoubtedly affect the adsorption process. Here, we synthesized CC/γ-MnO2 by growing MnO2 on carbon cloth (CC), followed by the creation of oxygen vacancies (OVs) through electrochemical methods to form CC/γ-MnO2-OVs. The CC/γ-MnO2-OVs shows significantly enhanced selectivity and durability for UO22+, with the maximum adsorption capacity increasing from 456.8 to 1648.1 mg/g (by a factor of 3.6). Theoretical calculations suggest that the generation of OVs leads to an increase in charge transfer and a decrease in adsorption energy between UO22+ and CC/γ-MnO2, due to the interaction between Mn 3d orbital in CC/γ-MnO2 and O 2p orbital in UO22+. The OVs in CC/γ-MnO2 provide a spatial structure for anchoring the OU=O moiety of UO22+, while the surface van der Waals forces and the formation of chemical bonds between Mn-U contribute to charge interactions. This synergistic effect allows CC/γ-MnO2-OVs to exhibit favorable selectivity, a large adsorption capacity, and rapid adsorption kinetics towards uranyl ions. This work achieves enhanced UO22+ separation by introducing OVs in CC/γ-MnO2 through a facile electrochemical strategy, highlighting the great potential for nuclear waste processing.
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Affiliation(s)
- Shuang Zhang
- Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology, Nanchang 330013 Jiangxi, China; State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China
| | - Fan Yang
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China
| | - Xiaohui Cao
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China
| | - Yong Tang
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China
| | - Taiqi Yin
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Tao Bo
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Yunhai Liu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China
| | - Grzegorz Lisak
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Residues and Resource Reclamation Centre (R3C), Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141, Singapore, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Naoki Kano
- Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University, 8050 Ikarashi 2-Noch@, Nishi-ku, Niigata city, Niigata 950-2181, Japan
| | - Bing Na
- Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology, Nanchang 330013 Jiangxi, China; State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China.
| | - Mengyu Chang
- Departments of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston 77030 TX, USA.
| | - Yuhui Liu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013 Jiangxi, China.
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