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Nanoporous ZIF-67 embedded polymers of intrinsic microporosity membranes with enhanced gas separation performance

Wu, Xingyu, Liu, Wei, Wu, Hong, Zong, Xue, Yang, Leixin, Wu, Yingzhen, Ren, Yanxiong, Shi, Chengyou, Wang, Shaofei, Jiang, Zhongyi
Journal of membrane science 2018 v.548 pp. 309-318
artificial membranes, carbon dioxide, chemical bonding, cobalt, hydrogen, methane, models, nanoparticles, nanopores, permeability, polymers, sieving
In this study, novel kinds of MMMs were fabricated by incorporating ZIF-67 nanoparticles into polymers of intrinsic microporosity (PIM-1). ZIF-67 (Co substituted ZIF-8) displays stiffer Co-N bond as compared with the Zn-N bond in ZIF-8, which might led to the slightly smaller effective pore aperture of ZIF-67. Good compatibility between ZIF-67 nanoparticles and PIM-1 matrix rendered ideal interfacial morphology. The intrinsic separation performance of ZIF-67 was estimated from our experimental separation results based on the Maxwell model. The calculation demonstrated its superior CO2/CH4 selectivity of 45, which is twice compared with that of ZIF-8, supporting the high molecular sieving efficiency of PIM-1/ZIF-67 MMMs. Particularly, the CO2 and H2 permeability increased by 15.1% and 59.6% for PIM-1 membrane with 20wt% ZIF-67 loading, meanwhile CO2/CH4 and H2/CH4 selectivity increased by 34.4% and 86.96%, respectively. The strategy of incorporating highly selective ZIFs into polymers of intrinsic microporosity may have promising potential in fabricating high performance membranes for efficient gas separation.