Abstract The production of biomethane from the biogas purification process depends on the capacity of the separation technique employed to separate methane from carbon dioxide. Mixed matrix membranes (MMMs) combine the benefits of polymeric and inorganic materials, and it is believed that the trade-off between gas permeability and selectivity in polymeric membranes can be hampered by MMMs. Until recently, the development of MMMs for the biogas purification process has been constrained in lab scales. To be applied in large scales, the increase in gas permeability as well as the membrane performance under the influence of CO2 plasticization needs to be investigated. This paper reports the evaluation of gas permeability and CO2/CH4 gas separation performances of nano zeolitic imidazolate framework (ZIF)-8/Pebax-1657 to be used for biogas purification processes. In addition, the study on the CO2 plasticization behavior of MMMs fabricated with co-polymer Pebax was investigated. The incorporation of nanoZIF-8 particles inhibited the increase of CO2 permeability due to the reduced polymer flexibility. In addition, the diffusional selectivity of ZIF-8 improves the permeation behavior of both gases through MMMs. With nanoZIF-8/Pebax-1657 MMMs, the incorporation of particles improves the gas permeability with a slight decrease in gas selectivity, indicating a potentiality of the membranes used for biogas purification processes.

中文翻译：

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用于沼气净化的 nanoZIF-8/聚合物基混合基质膜的高透气性

摘要 沼气净化过程中生物甲烷的生产取决于将甲烷与二氧化碳分离的分离技术的能力。混合基质膜 (MMM) 结合了聚合物和无机材料的优点，据信，聚合物膜的透气性和选择性之间的权衡会受到 MMM 的阻碍。直到最近，用于沼气净化过程的 MMM 的开发还受到实验室规模的限制。为了大规模应用，需要研究在 CO2 塑化影响下气体渗透性的增加以及膜性能。本文报告了用于沼气净化过程的纳米沸石咪唑酯骨架 (ZIF)-8/Pebax-1657 的透气性和 CO2/CH4 气体分离性能的评估。此外，还研究了共聚物 Pebax 制备的 MMM 的 CO2 增塑行为。由于聚合物柔韧性降低，nanoZIF-8 颗粒的掺入抑制了 CO2 渗透性的增加。此外，ZIF-8 的扩散选择性改善了两种气体通过 MMM 的渗透行为。对于 nanoZIF-8/Pebax-1657 MMM，颗粒的掺入提高了气体渗透性，但气体选择性略有下降，表明该膜具有用于沼气净化过程的潜力。研究了用共聚物 Pebax 制造的 MMMs 的 CO2 增塑行为。由于聚合物柔韧性降低，nanoZIF-8 颗粒的掺入抑制了 CO2 渗透性的增加。此外，ZIF-8 的扩散选择性改善了两种气体通过 MMM 的渗透行为。对于 nanoZIF-8/Pebax-1657 MMM，颗粒的掺入提高了气体渗透性，但气体选择性略有下降，表明该膜具有用于沼气净化过程的潜力。研究了用共聚物 Pebax 制造的 MMMs 的 CO2 增塑行为。由于聚合物柔韧性降低，nanoZIF-8 颗粒的掺入抑制了 CO2 渗透性的增加。此外，ZIF-8 的扩散选择性改善了两种气体通过 MMM 的渗透行为。对于 nanoZIF-8/Pebax-1657 MMM，颗粒的掺入提高了气体渗透性，但气体选择性略有下降，表明该膜具有用于沼气净化过程的潜力。