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Covalent organic framework membranes with vertically aligned nanorods for efficient separation of rare metal ions

Author

Listed:
  • Qinghua Liu

    (Nanjing Tech University)

  • Ming Liu

    (Nanjing Tech University)

  • Zhe Zhang

    (Nanjing Tech University)

  • Congcong Yin

    (Southeast University)

  • Jianghai Long

    (Nanjing Tech University)

  • Mingjie Wei

    (Nanjing Tech University)

  • Yong Wang

    (Nanjing Tech University
    Southeast University)

Abstract

Covalent organic frameworks (COFs) have emerged as promising platforms for membrane separations, while remaining challenging for separating ions in a fast and selective way. Here, we propose a concept of COF membranes with vertically aligned nanorods for efficient separation of rare metal ions. A quaternary ammonium-functionalized monomer is rationally designed to synthesize COF layers on porous substrates via interfacial synthesis. The COF layers possess an asymmetric structure, in which the upper part displays vertically aligned nanorods, while the lower part exhibits an ultrathin dense layer. The vertically aligned nanorods enlarge contact areas to harvest water and monovalent ions, and the ultrathin dense layer enables both high permeability and selectivity. The resulting membranes exhibit exceptional separation performances, for instance, a Cs+ permeation rate of 0.33 mol m−2 h−1, close to the value in porous substrates, and selectivities with Cs+/La3+ up to 75.9 and 69.8 in single and binary systems, highlighting the great potentials in the separation of rare metal ions.

Suggested Citation

  • Qinghua Liu & Ming Liu & Zhe Zhang & Congcong Yin & Jianghai Long & Mingjie Wei & Yong Wang, 2024. "Covalent organic framework membranes with vertically aligned nanorods for efficient separation of rare metal ions," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53625-3
    DOI: 10.1038/s41467-024-53625-3
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    References listed on IDEAS

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