Abstract
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 CO2/N2. This investigation focused on the gas permeance and separation performance of the MMMs. The optimized CO2/N2 separation factor reached [Formula: see text], with a CO2 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 CO2 permeability and CO2/N2 selectivity. OSF-WPU/Amino-NP MMMs demonstrated superior performance, emphasize their potential for stable long-term operation in practical CO2 separation applications.
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