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<p>Helium (He) recovery via conventional cryogenic distillation is highly energy-intensive and costly. Membrane separation features modularity and efficiency, but mixed-matrix membranes (MMMs) often suffer from discontinuous channels and poor filler–polymer compatibility, which impair separation performance. Here, we report an MMM platform by embedding a continuous 3D nanoporous ZIF-67-NH<sub>2</sub> gel within a polyimide matrix. The gel functions as a dual-functional crosslinker, forming covalent amide linkages and hydrogen bonds with the polymer to eliminate interfacial voids, while creating interconnected, selective nanochannels through its intrinsic nanoporosity. This yields He/CH<sub>4</sub> performance: 549 Barrer He permeability and 110.3 selectivity, surpassing the benchmark membranes. The membrane retains over 95% performance in mixed-gas tests over 180 h. Process simulations show that a hybrid membrane–cryogenic system achieves &gt;93% He recovery and 74% energy savings. This work provides an energy-efficient platform for critical gas separations.</p>

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MOF gel network crosslinked mixed matrix membranes with engineered interface for high-efficiency Helium recovery

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月7日

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  • Keming Zhang,
  • Haishan Huan,
  • Xiaohe Tian,
  • Chongshan Yin,
  • Xiaohua Ma,
  • Shaofei Wang

摘要

Helium (He) recovery via conventional cryogenic distillation is highly energy-intensive and costly. Membrane separation features modularity and efficiency, but mixed-matrix membranes (MMMs) often suffer from discontinuous channels and poor filler–polymer compatibility, which impair separation performance. Here, we report an MMM platform by embedding a continuous 3D nanoporous ZIF-67-NH2 gel within a polyimide matrix. The gel functions as a dual-functional crosslinker, forming covalent amide linkages and hydrogen bonds with the polymer to eliminate interfacial voids, while creating interconnected, selective nanochannels through its intrinsic nanoporosity. This yields He/CH4 performance: 549 Barrer He permeability and 110.3 selectivity, surpassing the benchmark membranes. The membrane retains over 95% performance in mixed-gas tests over 180 h. Process simulations show that a hybrid membrane–cryogenic system achieves >93% He recovery and 74% energy savings. This work provides an energy-efficient platform for critical gas separations.