Membrane-based separation technology has evolved as a competitive approach for CO₂ capture from flue gas (mainly N₂). To achieve high separation performance, three partially NH₂-, OH- and CH₃OH- functionalized mixed-linker-ZIF-7 were successfully synthesized, and incorporated into polyether-block-amide (Pebax® 2533) polymer to form mixed-matrix membranes (MMMs). As evidenced by the CO₂ adsorption isotherms, introducing functional groups in the ZIF-7 framework was indeed beneficial for CO₂ adsorption. All MMMs composed of ZIF-7-NH₂, ZIF-7-OH and ZIF-7-CH₃OH offered better CO₂/N₂ separation performance than the parent ZIF-7-Pebax® 2533 membrane, suggesting the positive effect of functionalized ZIF-7 fillers on the gas separation performance. Among the three functionalized ZIF-7 based MMMs, the ZIF-7-OH-Pebax MMMs exhibited the best performance for CO₂/N₂ separation, which might be ascribed to the highest adsorption selectivity of CO₂ over N₂ predicted by ideal adsorbed solution theory (IAST) for ZIF-7-OH fillers. The 14% ZIF-7-OH-Pebax MMM showed high CO₂ permeability of 273 Barrer and CO₂/N₂ separation factor of 38, which increased by 60% and 145% as compared with the neat Pebax membrane. The strategy of preparing functionalized MOFs with strong affinity for CO₂ provides an effective method to develop MMMs for highly efficient CO₂ separation.

基于膜的分离技术已经发展成为一种从烟气（主要是N ₂）捕获CO ₂的竞争方法。为了实现高分离性能，成功地合成了部分由NH _2-，OH-和CH ₃ OH官能化的_三种混合连接基-ZIF-7，并将其掺入到聚醚嵌段酰胺（Pebax®2533）聚合物中以形成混合基体膜（MMM）。如通过CO ₂吸附等温线所证明的，在ZIF-7骨架中引入官能团确实对CO ₂吸附是有益的。由ZIF-7-NH ₂，ZIF-7-OH和ZIF-7-CH ₃ OH组成的所有MMM均具有较好的CO ₂ / N ₂分离性能优于ZIF-7-Pebax®2533母膜，表明功能化ZIF-7填料对气体分离性能具有积极作用。在三种基于功能化ZIF-7的MMM中，ZIF-7-OH-Pebax MMM表现出最佳的CO ₂ / N ₂分离性能，这可能归因于理想吸附所预测的CO ₂对N ₂的最高吸附选择性。ZIF-7-OH填料的溶液理论（IAST）。14％ZIF-7-OH-Pebax MMM显示出273 Barrer的高CO ₂渗透率和CO ₂ / N ₂分离系数为38，与纯Pebax膜相比增加了60％和145％。制备对CO ₂具有强亲和力的功能化MOF的策略提供了开发用于高效CO ₂分离的MMM的有效方法。