Abstract
Polymers of intrinsic microporosity (PIMs) stand out as promising membrane materials with exceptional separation performance. In this study, we crafted a highly efficient gas separation membrane using an emerging material, called cyclohexyl-fused spirobiindane-based PIM (CCS-PIM). The CCS-PIM features a robust and rigid microporous structure with a high specific surface area (SBET = 704.6 m2/g), exhibiting excellent CO2-selective adsorption capacity. The CO2 adsorption uptake is 0.78 mmol/g at 273 K and 0.15 bar, leading to IAST selectivity of 25.2 for CO2/N2 (15/85 v/v) and 16.7 for CO2/CH4 (50/50 v/v) at 298 K. The precisely tuned pore size of the CCS-PIM membrane leads to an enhanced molecular sieving effect, showcasing superior selectivity across various gas pair separations. It demonstrates an O2/N2 selectivity of 6.03 and a CO2/CH4 selectivity of 26.1, surpassing the 2008 Robeson upper bounds. This study suggests a strategic method to improve gas separation efficiency by customizing a locked PIM structure with precise molecular sieving through the insertion of variously sized rings.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have