In Situ Synthesis of Uranyl‐Imprinted Nanocage for Selective Uranium Recovery from Seawater. (11th February 2022)

• Record Type: Journal Article
• Authors: Feng, Lijuan; Wang, Hui; Feng, Tiantian; Yan, Bingjie; Yu, Qiuhan; Zhang, Jiacheng; Guo, Zhanhu; Yuan, Yihui; Ma, Chunxin; Liu, Tao; Wang, Ning
• Is Part Of: Angewandte Chemie. Volume 134:Number 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-11
• Subjects: coordination structures -- molecular imprinting -- selectivity -- uranium extraction; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202101015
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: 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. Abstract : An adsorbent was fabricated by the in situ construction of a uranyl‐imprinted nanostructure in a MOF material. Impressively, the adsorbent shows highly selective uranium extraction ability in natural seawater, which was attributed to the fitting coordination structure for uranyl.