Hierarchical Fibrous Metal-Organic Framework/Ionic Liquid Membranes for Efficient CO<sub>2</sub>/N<sub>2</sub> Separation.
basic_science · Level V
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- Record sourced from PubMed, PMID 39913309.
- Also identified by DOI 10.1021/acs.nanolett.4c05232.
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Abstract
The structural diversity and chemical functionality of metal-organic frameworks (MOFs) render them promising candidates for CO<sub>2</sub> adsorption and separation. However, their applications are often restricted by their intrinsic fragility and decreased processability. Herein, a hierarchical fibrous MOF/ionic liquid (IL) membrane was constructed by assembling well-ordered ZIF-8 nanounits with an encapsulated IL along the polyimide (PI) fibers. This design promotes the formation of an efficient three-dimensional gas transfer network and generates an abundance of nanopores decorated with CO<sub>2</sub>-philic units, thereby enhancing the separation of CO<sub>2</sub> from N<sub>2</sub>. The hierarchical fibrous PI/ZIF-8/IL membranes exhibit remarkable structural features, including a large specific surface area of 79.89 m<sup>2</sup> g<sup>-1</sup>, a high porosity of 93.28%, and excellent mechanical stability. Moreover, the PI/ZIF-8/IL membranes demonstrate an enhanced CO<sub>2</sub> adsorption capacity of 3.32 mmol/g at 298 K and 1 bar, an excellent CO<sub>2</sub>/N<sub>2</sub> selectivity of 28, and a stable recyclable regeneration capability. The integrated hierarchical pore structure proposed in this study provides a practical direction for the rational design of MOF/IL membranes for targeted gas separation applications.