Introducing pyrazole-based MOF to polymer of intrinsic microporosity for mixed matrix membranes with enhanced CO2/CH4 separation performance
JOURNAL OF MEMBRANE SCIENCE(2023)
摘要
The performance of mixed matrix membranes (MMMs) substantively depends on the intrinsic structure and composition of the introduced nanofillers. In this work, pyrazole-based metal-organic frameworks (termed as MOF-303) were introduced into polymer of intrinsic microporosity (PIM-1) through a physical blending approach. Thanks to the well CO2-philic capability, high porosity, and appropriate pore structure of the incorporated MOF-303, the obtained MMMs exhibited remarkable separation performance. The improved CO2 permeability and well-maintained CO2/CH4 selectivity were achieved. Specifically, MMMs introducing 30 wt% MOF-303 loading exhibited a CO2/CH4 selectivity of 27.6 and a high-CO2 permeability of 7528.2 Barrer, which were 2.2 and 1.9 times greater than those of the unfilled PIM-1 membranes, respectively. Furthermore, a 33-h continuous separation test verified the excellent stability of the manufactured MMMs. More importantly, the MMMs showed significant resistance against physical aging, retaining up to 92.8% of their original CO2 permeability after 150 days, compared to just 33.0% for control PIM-1 over the same period. Meanwhile, the plasticization resistance of the MMMs was reinforced compared to the unfilled PIM-1 membrane. This study potentially provides a novel approach for the rational design of MMMs in CO2 separation applications.
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关键词
mixed matrix membranes,intrinsic microporosity,polymer,pyrazole-based
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