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Scalable and switchable CO2-responsive membranes with high wettability for separation of various oil/water systems

Author

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  • Yangyang Wang

    (Jiangnan University)

  • Shaokang Yang

    (Jiangsu University)

  • Jingwei Zhang

    (Tsinghua University)

  • Zhuo Chen

    (Tsinghua University)

  • Bo Zhu

    (Jiangnan University)

  • Jian Li

    (Jiangnan University)

  • Shijing Liang

    (Fuzhou University)

  • Yunxiang Bai

    (Jiangnan University)

  • Jianhong Xu

    (Tsinghua University)

  • Dewei Rao

    (Jiangsu University)

  • Liangliang Dong

    (Jiangnan University)

  • Chunfang Zhang

    (Jiangnan University)

  • Xiaowei Yang

    (Shanghai Jiao Tong University)

Abstract

Smart membranes with responsive wettability show promise for controllably separating oil/water mixtures, including immiscible oil-water mixtures and surfactant-stabilized oil/water emulsions. However, the membranes are challenged by unsatisfactory external stimuli, inadequate wettability responsiveness, difficulty in scalability and poor self-cleaning performance. Here, we develop a capillary force-driven confinement self-assembling strategy to construct a scalable and stable CO2-responsive membrane for the smart separation of various oil/water systems. In this process, the CO2-responsive copolymer can homogeneously adhere to the membrane surface by manipulating the capillary force, generating a membrane with a large area up to 3600 cm2 and excellent switching wettability between high hydrophobicity/underwater superoleophilicity and superhydrophilicity/underwater superoleophobicity under CO2/N2 stimulation. The membrane can be applied to various oil/water systems, including immiscible mixtures, surfactant-stabilized emulsions, multiphase emulsions and pollutant-containing emulsions, demonstrating high separation efficiency (>99.9%), recyclability, and self-cleaning performance. Due to robust separation properties coupled with the excellent scalability, the membrane shows great implications for smart liquid separation.

Suggested Citation

  • Yangyang Wang & Shaokang Yang & Jingwei Zhang & Zhuo Chen & Bo Zhu & Jian Li & Shijing Liang & Yunxiang Bai & Jianhong Xu & Dewei Rao & Liangliang Dong & Chunfang Zhang & Xiaowei Yang, 2023. "Scalable and switchable CO2-responsive membranes with high wettability for separation of various oil/water systems," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36685-9
    DOI: 10.1038/s41467-023-36685-9
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    References listed on IDEAS

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    1. Youxing Jiang & Alice Lee & Jiayun Chen & Martine Cadene & Brian T. Chait & Roderick MacKinnon, 2002. "Crystal structure and mechanism of a calcium-gated potassium channel," Nature, Nature, vol. 417(6888), pages 515-522, May.
    2. Guohua Zhang & Bingyu Li & Yan Zhou & Xiaofei Chen & Bao Li & Zhong-Yuan Lu & Lixin Wu, 2020. "Processing supramolecular framework for free interconvertible liquid separation," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
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