The advancements in mixed matrix membranes containing functionalized MOFs and 2D materials for CO2/N2 separation and CO2/CH4 separation
Guoqiang Li, Joanna Kujawa, Katarzyna Knozowska, Aivaras Kareiva, Éric Favre, Christophe Castel, Wojciech Kujawski
Abstract
• Mixed Matrix Membranes (MMMs) show high CO 2 separation efficiency. • The functionalization of MOFs significantly enhances CO 2 separation. • 2D materials effectively modify the CO 2 transport pathways. • MOF@2D composite fillers are promising in the fabrication of efficient MMMs. CO 2 separation plays a crucial role in tackling the climate change induced by the greenhouse effects and improving the energy quality of natural gas and biogas. The efficient CO 2 separation technology is highly required. Membrane separation technology is particularly attractive in CO 2 separation processes owing to its advantages. However, the trade-off relationship limited the gas separation efficiency of polymeric membranes in gas separation processes. Therefore, it is necessary to prepare the high-performance membranes such as mixed matrix membranes (MMMs) for CO 2 separation. This review mainly focuses on the preparation methods, the material properties and the CO 2 separation efficiency of the MMMs containing various fillers such as modified ZIFs, MOFs, and GO, and the emerging MOF-based composites, 2D MOFs and 2D MXene. The modified fillers demonstrated higher compatibility with polymer matrix, resulting in enhanced mechanical stability and CO 2 separation efficiency of MMMs. 2D materials could significantly enhance the CO 2 separation efficiency of MMMs, owing to their layered structure and the effective regulation of gas transport ways. Finally, the future direction and conclusions of fillers and MMMs in gas separation processes are provided.