A review of metal-organic frameworks and polymers in mixed matrix membranes for CO capture.

Polymeric membranes offer an appealing solution for sustainable CO capture, with potential for large-scale deployment. However, balancing high permeability and selectivity is an inherent challenge for pristine membranes. To address this challenge, the development of mixed matrix membranes (MMMs) is a promising strategy. MMMs are obtained by carefully integrating porous nano-fillers into polymeric matrices, enabling the simultaneous enhancement of selectivity and permeability. In particular, metal-organic frameworks (MOFs) have gained recognition as MMM fillers for CO capture. Here, a review of the current state, recent advancements, and challenges in the fabrication and engineering of MMMs with MOFs for selective CO capture is proposed. Key considerations and promising research directions to fully exploit the gas separation potential of MOF-based MMMs in CO capture applications are highlighted.