A novel design to synthesize a defect-free mixed-matrix membrane (MMM) exhibiting superior gas separation performance via fully dispersed blunt zeolitic imidazolate framework (ZIF-8) in polymer matrix has been proposed for the first time. The sphericity and interconnected six-membered-ring (6-MR) pore porosity of ZIF-8 was controlled through an aqueous synthetic process by using a non-ionic surfactant (Pluronics, P123) and deionized water as solvent. The use of surfactant in ZIF-8 synthesis resulted in blunt nanocrystals with increased sphericity and 6-MR pore volume as confirmed by scanning electron microscopy (SEM) and nitrogen adsorption–desorption isotherm measurements. Subsequent pure gas permeation tests showed that blunt ZIF-8 increased CO₂/N₂ separation performance through “ideal morphology” in MMMs as a result of the excellent dispersion of ZIF-8 and good ZIF-8-polymer interfacial adhesion within the polymer matrix. A significant increase in CO₂/N₂ separation results were obtained with the MMM containing 10wt% loading of blunt ZIF-8 (P51), CO₂ permeability of 21.5 Barrer (172.6%), and mixed-gas CO₂/N₂ selectivity of 43.9 (205.6%). The MMMs further displayed good aging-resistance properties for over 40 days, with considerable potential for long-term operation.

首次提出了一种新颖的设计来合成无缺陷的混合基质膜（MMM），该膜通过在聚合物基质中完全分散的钝化沸石咪唑酸酯骨架（ZIF-8）表现出优异的气体分离性能。通过使用非离子表面活性剂（Pluronics，P123）和去离子水作为溶剂，通过水合成工艺控制ZIF-8的球形度和互连的六元环（6-MR）孔隙度。表面活性剂在ZIF-8合成中的使用导致钝化的纳米晶体具有增加的球形度和6-MR孔体积，这已通过扫描电子显微镜（SEM）和氮吸附-解吸等温线测量得到证实。随后的纯气体渗透测试表明，钝的ZIF-8会增加CO ₂ / N ₂ZIF-8的出色分散性和聚合物基质内良好的ZIF-8-聚合物界面粘合力，可通过MMM中的“理想形态”实现分离性能。MMM的钝化ZIF-8（P51）负载量为10wt％，CO ₂渗透率为21.5 Barrer（172.6％），混合气体的CO ₂ / N ₂选择性显着提高了CO ₂ / N ₂分离结果。占43.9（205.6％）。MMM在超过40天的时间内还表现出良好的抗老化性能，具有长期运行的巨大潜力。