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The novel mixed-matrix membrane (MMMs) by incorporating covalently amino groups grafted nano-silica (Amino-NP) into an eco-friendly, organic solvent-free waterborne polyurethane (OSF-WPU) matrix for the separation application of CO 2 /N 2 . This investigation focused on the gas permeance and separation performance of the MMMs. The optimized CO 2 /N 2 separation factor reached [Formula: see text], with a CO 2 permeance of [Formula: see text] GPU under conditions of 1.0 bar and 25 ∘ C in a wet mixed-gas state. Incorporating even a tiny amount of Amino-NP efficiently enhanced CO 2 permeability and CO 2 /N 2 selectivity. OSF-WPU/Amino-NP MMMs demonstrated superior performance, emphasize their potential for stable long-term operation in practical CO 2 separation applications.
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Chin et al. (2024) studied this question.
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