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<p>Mixed matrix membranes (MMMs) capable of breaking the permeability-selectivity trade-off suffer from the inefficient and disconnected bulky transport channels as well as inferior interfacial compatibility between nanomaterials and polymers. Herein, we propose an original photothermal-triggered in-situ gelation approach to elaborate an original class of MMMs, termed nanofiber-interwoven gel membranes (NIGMs) that feature tunable 3D-interconnected ultrafast transport channels and highly-selective CO<sub>2</sub>-philic gel for boosting CO<sub>2</sub> separation performance. The key design of NIGMs lies in leveraging dual functions of CNT-interwoven skeleton: (1) serving as a photothermal confined reactor that rapidly triggers in-situ gelation of highly-selective CO<sub>2</sub>-philic gel without phase separation-induced interfacial defects to construct defect-free and thickness-controllable NIGMs; (2) functioning as a 3D-interconnected continuous skeleton for providing ultrafast CO<sub>2</sub> transport channels. By orchestrating the distribution and configuration of interwoven nanofibers, the NIGMs possess a boosted CO<sub>2</sub> permeance of 211.0 GPU increased by 1558% over polymeric gel counterparts and an ultrahigh CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub> selectivity of up to 151 and 47 respectively. Our work offers a paradigm shift in developing advanced MMMs beyond gas separation.</p>

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Nanofiber-interwoven gel membranes with tunable 3D-interconnected transport channels for efficient CO2 separation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月2日

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  • Hao-Nan Li,
  • Ze-Yu Sun,
  • Zhen-Jie Yu,
  • Kexin Man,
  • Chao Zhang,
  • Zhi-Kang Xu

摘要

Mixed matrix membranes (MMMs) capable of breaking the permeability-selectivity trade-off suffer from the inefficient and disconnected bulky transport channels as well as inferior interfacial compatibility between nanomaterials and polymers. Herein, we propose an original photothermal-triggered in-situ gelation approach to elaborate an original class of MMMs, termed nanofiber-interwoven gel membranes (NIGMs) that feature tunable 3D-interconnected ultrafast transport channels and highly-selective CO2-philic gel for boosting CO2 separation performance. The key design of NIGMs lies in leveraging dual functions of CNT-interwoven skeleton: (1) serving as a photothermal confined reactor that rapidly triggers in-situ gelation of highly-selective CO2-philic gel without phase separation-induced interfacial defects to construct defect-free and thickness-controllable NIGMs; (2) functioning as a 3D-interconnected continuous skeleton for providing ultrafast CO2 transport channels. By orchestrating the distribution and configuration of interwoven nanofibers, the NIGMs possess a boosted CO2 permeance of 211.0 GPU increased by 1558% over polymeric gel counterparts and an ultrahigh CO2/N2 and CO2/CH4 selectivity of up to 151 and 47 respectively. Our work offers a paradigm shift in developing advanced MMMs beyond gas separation.