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Microporous membrane with ionized sub-nanochannels enabling highly selective monovalent and divalent anion separation

Author

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  • Mei-Ling Liu

    (Nanjing Tech University
    NJTECH University Suzhou Future Membrane Technology Innovation Center)

  • Yu Chen

    (Nanjing Tech University)

  • Chuan Hu

    (Hanyang University)

  • Chun-Xu Zhang

    (Nanjing Tech University)

  • Zheng-Jun Fu

    (Nanjing Tech University)

  • Zhijun Xu

    (Nanjing Tech University)

  • Young Moo Lee

    (Hanyang University)

  • Shi-Peng Sun

    (Nanjing Tech University
    NJTECH University Suzhou Future Membrane Technology Innovation Center
    Suzhou Laboratory)

Abstract

Membranes tailored for selective ion transport represent a promising avenue toward enhancing sustainability across various fields including water treatment, resource recovery, and energy conversion and storage. While nanochannels formed by polymers of intrinsic microporosity (PIM) offer a compelling solution with their uniform and durable nanometer-sized pores, their effectiveness is hindered by limited interactions between ions and nanochannel. Herein, we introduce the randomly twisted V-shaped structure of Tröger’s Base unit and quaternary ammonium groups to construct ionized sub-nanochannel with a window size of 5.89–6.54 Å between anion hydration and Stokes diameter, which enhanced the dehydrated monovalent ion transport. Combining the size sieving and electrostatic interaction effects, sub-nanochannel membranes achieved exceptional ion selectivity of 106 for Cl-/CO32- and 82 for Cl-/SO42-, significantly surpassing the state-of-the-art membranes. This work provides an efficient template for creating functionalized sub-nanometer channels in PIM membranes, and paves the way for the development of precise ion separation applications.

Suggested Citation

  • Mei-Ling Liu & Yu Chen & Chuan Hu & Chun-Xu Zhang & Zheng-Jun Fu & Zhijun Xu & Young Moo Lee & Shi-Peng Sun, 2024. "Microporous membrane with ionized sub-nanochannels enabling highly selective monovalent and divalent anion separation," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51540-1
    DOI: 10.1038/s41467-024-51540-1
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    References listed on IDEAS

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    1. Peipei Zuo & Chunchun Ye & Zhongren Jiao & Jian Luo & Junkai Fang & Ulrich S. Schubert & Neil B. McKeown & T. Leo Liu & Zhengjin Yang & Tongwen Xu, 2023. "Near-frictionless ion transport within triazine framework membranes," Nature, Nature, vol. 617(7960), pages 299-305, May.
    2. Jiuyuan Wang & Lidya G. Tarhan & Andrew D. Jacobson & Amanda M. Oehlert & Noah J. Planavsky, 2023. "The evolution of the marine carbonate factory," Nature, Nature, vol. 615(7951), pages 265-269, March.
    3. Sheng Zhou & Osama Shekhah & Adrian Ramírez & Pengbo Lyu & Edy Abou-Hamad & Jiangtao Jia & Jiantang Li & Prashant M. Bhatt & Zhiyuan Huang & Hao Jiang & Tian Jin & Guillaume Maurin & Jorge Gascon & Mo, 2022. "Asymmetric pore windows in MOF membranes for natural gas valorization," Nature, Nature, vol. 606(7915), pages 706-712, June.
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