COF-JLU2 and ionic liquid incorporated PVAm membranes for enhanced CO2 separation with high selectivity under humid conditions

Facilitated transport membranes based on poly(vinylamine) (PVAm) exhibit high CO 2 selectivity but suffer from limited stability and performance trade-offs under humid conditions. Herein, we report an ionic liquid (IL) incorporation strategy coupled with covalent organic framework (COF) regulation to spatially tailor transport pathways in PVAm membranes. The incorporation of COF-JLU2 contributes to CO 2 separation through its high adsorption affinity and its role in modulating gas transport pathways, while the IL enhances carrier-mediated CO 2 transport. This structural integration promotes CO 2 sorption and transport while suppressing non-selective gas permeation. As a result, the hybrid membrane achieves a CO 2 /N 2 selectivity exceeding 170 with improved permeance under humid conditions, outperforming conventional PVAm-based systems. The performance enhancement is attributed to the combined effects of COF incorporation and PVAm-IL interactions, although the individual contributions of different transport mechanisms are not quantitatively decoupled in this study. Process simulation further indicates the potential of the developed membranes for post-combustion CO 2 capture based on a preliminary techno-economic assessment. However, further validation with more detailed process models, as well as long-term stability and pilot-scale testing, will be necessary to fully evaluate industrial applicability.