Abstract
Selective capture of UO22+ and Sr2+ ions represents a key component in the nuclear fuel reprocessing, nuclear accident prevention, and environmental protection. We report herein a proof of concept, employing metal-organic cage (MOC) for the selective capture of UO22+ or Sr2+ ions, through using a C3-symmetrical multiple-carboxylate ligand (H3L) to fix uranyl ions together. By means of such MOC approach, we can facilitate the extraction of uranyl ions from a multiple metallic mixed solution by using the H3L ligands as an extractant, showing an ultrahigh extraction efficiency of 97% and UO22+ selectivity of 19.4–97, suggesting its superior application in the UO22+ capture. The mechanism for such outstanding performance is due to the formation of a polyoxouranyl-based MOC. Moreover, this MOC compound can be also used as a solid adsorbent to selectively capture Sr2+ ions through a unique mechanism with the formation of a SrO4N2 octahedral coordination.
摘要
铀酰与二价锶离子的选择性捕获是核燃料后处理、核事故预防和环境保护的关键组成部分. 我们在此报道了一个概念验证, 通过使用C3对称的多羧酸配体(H3L)将铀酰离子固定在一起, 使用金属有机笼(MOC)选择性捕获铀酰与二价锶离子. 通过这种金属有机笼方法, 我们可以通过使用H3L配体作为萃取剂, 从多种金属混合溶液中高效提取铀酰离子, 萃取效率高达97%, 且铀酰选择性高达19.4–97, 展示了MOC在铀酰捕获中的应用. 此外, MOC也可用作固相吸附剂, 并通过形成一种SrO4N2 八面体来选择性捕获二价锶离子.
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Acknowledgements
This work was supported by the Training Program for Academic and Technical Leaders of Major Disciplines in Jiangxi Province (20194BCJ22010), the National Natural Science Foundations of China (21966002), the Youth Leading Talent Project of Fuzhou (2020ED64), and Jiangxi Project (DHSQT22021007). The authors also thank Wenqian Liu from Shiyanjia Lab (www.Shiyanjia.com) for the XRD analysis.
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Guo L and Zhang H conducted the experiment; Xia Y, Gong L, and Zhang L carried out the computational calculation; Luo F designed this study, analyzed the data and wrote the paper. All authors contributed to the general discussion.
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The authors declare that they have no conflict of interest.
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Experimental details and supporting data are available in the online version of the paper.
Liecheng Guo received his Bachelor degree from the East China University of Technology (ECUT) in 2018, and is now a graduate student at the ECUT. His research interest focuses on the synthesis and function of metal-organic frameworks (MOFs), covalent organic frameworks (COFs), and metal-organic cages (MOCs).
Huiping Zhang received his Master degree from the ECUT in 2022. He is now a PhD candidate at Jinan University. His research interest focuses on the synthesis, properties, and application of MOFs and MOCs.
Yongming Xia received his Bachelor degree from Changsha University of Science and Technology in 2019. He is now a graduate student at Beijing University of Chemical Technology. His research interests focus on the theoretical calculation of electronic adsorption structures.
Feng Luo received his PhD degree from Nankai University in 2009, and then joined the faculty of the School of Biology, Chemistry and Material Science, ECUT in 2009, and got the full professorship in 2016. His current research interests include the molecular design and properties of MOFs, COFs, and MOCs.
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Guo, L., Zhang, H., Xia, Y. et al. Employing metal-organic cage for selective capture of UO22+ and Sr2+. Sci. China Mater. 66, 3285–3291 (2023). https://doi.org/10.1007/s40843-023-2454-4
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DOI: https://doi.org/10.1007/s40843-023-2454-4