In Situ Synthesis of Uranyl-Imprinted Nanocage for Selective Uranium Recovery from Seawater
In Situ Synthesis of Uranyl-Imprinted Nanocage for Selective Uranium Recovery from Seawater
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DOI：
10.1002/anie.202101015
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发表时间：
2022-02-11
影响因子：
16.6
通讯作者：
Wang, Ning
中科院分区：
文献类型：
--
作者：
Feng, Lijuan;Wang, Hui;Wang, Ning
自适应配位结构是海水铀选择性提取的关键。通过分子印迹的策略，在合成过程中将铀酰引入多元金属有机框架（MOF）中，以指导原位构建合适的纳米笼结构用于靶向铀酰结合。除了铀与材料中的四个氧原子配位外，铀酰的轴向氧原子还与酚羟基上的氢形成氢键，增强了材料与铀酰的结合亲和力。由于该吸附剂具有较高的结合亲和力，因此对海水中的铀酰具有很高的选择性，不仅能与金属离子发生反应，而且能与铀酰形成[UO 2（CO）（3）]（4-）的碳酸根基团发生反应。在天然海水中，该吸附剂对铀的吸附容量为7.35mgg（-1），对钒的选择性提高了18.38倍。
An adaptive coordination structure is vital for selective uranium extraction from seawater. By strategy of molecular imprinting, uranyl is introduced into a multivariate metal-organic framework (MOF) during the synthesis process to guide the in situ construction of proper nanocage structure for targeting uranyl binding. Except for the coordination between uranium with four oxygen from the materials, the axial oxygen of uranyl also forms hydrogen bonds with hydrogen from the phenolic hydroxyl group, which enhances the binding affinity of the material to uranyl. Attributing to the high binding affinity, the adsorbent shows high uranium binding selectivity to uranyl against not only the interfering metal ions, but also the carbonate group that coordinates with uranyl to form [UO2(CO)(3)](4-) in seawater. In natural seawater, the adsorbent realizes a high uranium adsorption capacity of 7.35 mg g(-1), together with an 18.38 times higher selectivity to vanadium.