关键词: 金属-有机骨架, 复合填料, 混合基质膜, 气体分离, 低浓度CO ₂

Abstract:

Direct air capture of CO₂ is a necessary component for global warming suppression, and developing efficient technologies for low-concentration CO₂ separation has become a focus of scientific research in recent years. In this study, fluorine-containing 1F-PUiO-66, a polymer-MOF composite, was used as a filler material and blended with the corresponding cPIM-1 polymer matrix to construct mixed matrix membranes with loading of up to 50%(mass) and high affinity for CO₂, achieving efficient separation of low-concentration CO₂. Specifically, the prepared 50%(mass) 1F-PUiO-66/cPIM-1 membrane exhibited a CO₂ permeability as high as 6428.3 Barrer under 1%(vol) low CO₂ concentration inlet condition, and the CO₂/N₂ selectivity increased to 69.13, which improved the performance values by 1167.3% and 81.2%, respectively, compared to cPIM-1 pure membranes, and substantially exceeded the 2019 Robeson upper bound. This study demonstrates the significant CO₂/N₂ separation potential of polymer-MOF composite materials under low CO₂ concentration inlet conditions, which is important for actual industrial gas separation.

Key words: metal-organic framework, composite filler, mixed matrix membrane, gas separation, low concentration CO₂