In recent years, amorphous metal–organic frameworks (AMOFs) with original structural units but no long-range ordering have attracted much attention. However, AMOFs with abundant open metal sites (OMSs) have seldom been applied for gas separation membranes mainly attributed to poor membrane-forming property caused by large particle sizes. In this work, we proposed the method of polymer induction for the first time to obtain small-sized AMOFs particles with stronger alkaline stability, higher hydrophilicity and better CO₂/N₂ adsorption selectivity than crystal, which were applied to mixed matrix membranes (MMMs) as filler, exhibiting good separation performance. First, polyethyleneimine (PEI) was used as an inducer to obtain small-sized UiO-66-NH₂ particles (SU-1) and improve the membrane-forming property. Additionally, we adopted a thermal-treatment method to treat the particles and obtained an amorphous SU-1 (ASU-1). Furthermore, MMMs were prepared by uniformly mixing ASU-1 filler with strong basic polymer polyvinylamine (PVAm), and the prepared MMMs showed the optimal CO₂ separation performance at an ASU-1 loading of 28.5 wt%, with a CO₂/N₂ selectivity of 71.33 at 1.5 bar and a CO₂ permeance of 721 GPU, which was much higher than the MMM using pristine PVAm and SU-1. This study provides a promising strategy for preparing high-performance MMMs through decreasing particle size and increasing the separation performance of MOF fillers.

近年来，具有原始结构单元但无长程有序的非晶态金属有机框架（AMOF）引起了人们的广泛关注。然而，具有大量开放金属位点（OMS）的AMOF很少用于气体分离膜，这主要归因于大粒径导致的膜形成性能差。在这项工作中，我们首次提出了聚合物诱导的方法，以获得比晶体具有更强的碱稳定性，更高的亲水性和更好的CO ₂ / N ₂吸附选择性的小尺寸AMOFs颗粒，并将其应用于混合基质膜（MMMs）。 ）作为填料，表现出良好的分离性能。首先，将聚乙烯亚胺（PEI）用作诱导剂以获得小尺寸的UiO-66-NH ₂颗粒（SU-1）并改善成膜性。此外，我们采用了一种热处理方法来处理颗粒，并获得了无定形SU-1（ASU-1）。此外，通过将ASU-1填料与强碱性聚合物聚乙烯胺（PVAm）均匀混合来制备MMM，制备的MMM在28.5 wt％的ASU-1载量下具有最佳的CO ₂分离性能，CO ₂ / N ₂在1.5 bar下的选择性为71.33，CO ₂渗透率为721 GPU，远高于使用原始PVAm和SU-1的MMM。这项研究为通过减小粒径和提高MOF填料的分离性能提供了制备高性能MMM的有前途的策略。