Feng Lijuan, Wang Hui, Feng Tiantian, Yan Bingjie, Yu Qiuhan, Zhang Jiacheng, Guo Zhanhu, Yuan Yihui, Ma Chunxin, Liu Tao, Wang Ning
State Key Laboratory of Marine Resource Utilization in, South China Sea, Hainan University, Haikou, 570228, P. R. China.
Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
Angew Chem Int Ed Engl. 2022 Mar 21;61(13):e202101015. doi: 10.1002/anie.202101015. Epub 2022 Feb 11.
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 [UO (CO) ] in seawater. In natural seawater, the adsorbent realizes a high uranium adsorption capacity of 7.35 mg g , together with an 18.38 times higher selectivity to vanadium.
一种自适应配位结构对于从海水中选择性提取铀至关重要。通过分子印迹策略，在合成过程中将铀酰引入到多元金属有机框架（MOF）中，以指导原位构建用于靶向铀酰结合的合适纳米笼结构。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的氢形成氢键，这增强了材料对铀酰的结合亲和力。由于具有高结合亲和力，该吸附剂不仅对干扰金属离子，而且对与铀酰配位形成[UO(CO)]的碳酸根离子，都表现出对铀酰的高铀结合选择性。在天然海水中，该吸附剂实现了7.35 mg g的高铀吸附容量，对钒的选择性也高出18.38倍。
