Metal-organic cages improving microporosity in polymeric membrane for superior CO<sub>2</sub> capture.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39841833.
- Also identified by DOI 10.1126/sciadv.ads0583 and PMC identifier 11753381.
- Licence recorded as CC BY-NC.
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Abstract
Mixed matrix membranes, with well-designed pore structure inside the polymeric matrix via the incorporation of inorganic components, offer a promising solution for addressing CO<sub>2</sub> emissions. Here, we synthesized a series of novel metal organic cages (MOCs) with aperture pore size precisely positioned between CO<sub>2</sub> and N<sub>2</sub> or CH<sub>4</sub>. These MOCs were uniformly dispersed in the polymers of intrinsic microporosity (PIM-1). Among them, the MOC-Ph cage effectively modulated chain packing and optimized the microporous structure of the membrane. Remarkably, the PIM-Ph-5% membrane shows superior performance, achieving an excellent CO<sub>2</sub> permeability of 8803.4 barrer and CO<sub>2</sub>/N<sub>2</sub> selectivity of 59.9, far exceeding the 2019 upper bound. This approach opens opportunities for improving the porous structure of polymeric membranes for CO<sub>2</sub> capture and other separation applications.