(286f) MOF-Based Mixed Matrix Membranes for Enhanced Gas Separation

Mixed matrix membranes (MMMs) combine the advantages of polymers and inorganic materials and demonstrate higher gas permeability than polymeric membranes. However, MMMs face two key challenges: 1) the filler permeability in MMMs is determined mostly by the Maxwell model and the accuracy of model prediction is rarely explored; 2) the incompatible interface ascribed to the intrinsically different nature of the polymer and inorganic phase leads to low membrane selectivity. To address these challenges, we first investigate four permeation models, the Maxwell, Lewis-Nielsen, Bruggeman, and Pal model, to accurately determine the filler permeability in MMMs. The relative mean deviation among the four models in predicting the filler-polymer permeability ratio was analyzed. Based on the model prediction, we project ZIF-8 to have a C₃H₆ permeability of 52-189 Barrer with a C₃H₆/C₃H₈ selectivity of 43-72, aligning well with experimental results on inorganic membranes. Furthermore, this talk introduces a molecular design strategy to establish intensive π-π stacking and hydrogen bonds between MOF and polyimide the interfacial compatibility of MMMs. The defect-free MMMs with 50 wt.% MOF loading exceed the latest Robeson upper bounds. This talks provides insights into predicting the filler permeability and designing MMMs with enhanced gas separation performance.

Keywords：Mixed matrix membranes; gas permeation models; metal-organic framework; gas separation; hydrogen bonding

References

[1] Q. Zhao, Y. Sun, J. Zhang, F. Fan, T. Li, G. He, C. Ma*, J. Membr. Sci. 2023, 693, 122336.

[2] Y. Sun, F. Fan, L. Bai, T. Li, J. Guan, F. Sun, Y. Liu, W. Xiao, G. He, C. Ma*，Results in Engineering, 2023, 20, 101398

[3] C. Ma, J.J Urban*, Adv. Funct. Mater.,2019, 29, 1903243.

[4] C. Ma, J.J Urban*, ChemSusChem., 2019, 12, 4405-4411.