In this work, a novel dual-facilitated bio-inspired zeolitic imidazolate framework (Bio-ZIF) was proposed to simulate the structure and function of carbonic anhydrase (CA), because it can overcome the low stability and high price of the CA. A novel type of mixed matrix membrane (MMM)-composed of Bio-ZIF and Pebax® MH 1657 (Pebax) was fabricated and used to enhance CO₂ separation performance. The bio-inspired active sites of Bio-ZIF can catalyze the reversible hydration of CO₂ in the form of bicarbonate to facilitate the quick transport of CO₂ across the MMMs, increasing CO₂ permeability. Furthermore, the amino groups of Bio-ZIF reacted with CO₂ to produce zwitterion as an intermediate during the reversible reaction, facilitating CO₂ permeation in the MMMs. It can be concluded that Bio-ZIF performed the dual-facilitated functions in the MMMs by reversible hydration and reversible reaction with CO₂ molecules. Thus, the as-prepared MMMs exhibited an excellent CO₂ separation performance. Particularly, Pebax/Bio-ZIF-12 MMM presented an optimal CO₂ permselectivity with CO₂ permeability of 542 ± 6.0 Barrer and CO₂/CH₄ separation factor of 40 ± 0.4, surpassing the 2008 upper bound. This work provided an ingenious strategy to design bio-inspired fillers to achieve dual-facilitated functions in MMMs for enhancing CO₂ separation.

在这项工作中，提出了一种新型的双重仿生沸石咪唑酯骨架（Bio-ZIF）来模拟碳酸酐酶（CA）的结构和功能，因为它可以克服 CA 的低稳定性和高价格。一种由 Bio-ZIF 和 Pebax® MH 1657 (Pebax) 组成的新型混合基质膜 (MMM) 被制造并用于提高 CO ₂分离性能。Bio-ZIF 的仿生活性位点可以以碳酸氢盐的形式催化 CO ₂的可逆水合作用，以促进 CO ₂通过 MMM的快速传输，增加 CO ₂渗透性。此外，Bio-ZIF 的氨基与 CO ₂反应在可逆反应过程中产生作为中间体的两性离子，促进MMM 中的CO ₂渗透。可以得出结论，Bio-ZIF 通过可逆水合和与 CO ₂分子的可逆反应在 MMM 中发挥双重促进功能。因此，所制备的 MMM 表现出优异的 CO ₂分离性能。特别是，Pebax材料/生物ZIF-12 MMM呈现最佳的CO ₂选择渗透性与CO ₂ 542±6.0巴雷的渗透性和CO ₂ / CH ₄分离因子为 40 ± 0.4，超过 2008 年的上限。这项工作为设计仿生填料提供了一种巧妙的策略，以在 MMM 中实现双重促进功能，以增强 CO ₂分离。