Wang Zhaojie, Sun Xinle, Liu Qinglong, Xia Caifeng, Yin Qikang, Liu Siyuan, Lu Xiaoqing, Chen Hongyu
Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China.
Dalton Trans. 2025 Apr 8;54(15):6281-6289. doi: 10.1039/d5dt00335k.
Mixed matrix membranes (MMMs), which incorporate metal-organic framework (MOF) nanofillers within a polymer matrix, offer a highly promising solution for CO capture and separation. However, poor interfacial compatibility and filler aggregation in MMMs pose significant challenges to enhancing CO/N separation performance. Here, we present a novel approach using amino-ionic liquid modification to optimize MMMs, where the modified AFIL promotes the formation of ZIF-8 with well-defined facets and sharp edges and enhances the compatibility between ZIF-8 particles and PIM-1 polymer matrixes for favorable CO affinity and selective CO transport. The resulting 10 wt% AFIL@ZIF-8/PIM-1 exhibits exceptional gas separation performance with a CO permeability of 7864 ± 262.2 Barrer and a CO/N selectivity of 29.66 ± 1.96. More importantly, the incorporation of AFIL into the ZIF-8 pores significantly enhances the thermal stability and aging resistance of AFIL@ZIF-8/PIM-1 MMMs structural support and hydrogen bonding interactions. This work provides a practical approach for developing hybrid membranes for CO/N separation, showcasing improved overall performance and strong interfacial compatibility.
