Mixed matrix membranes (MMMs) based on metal-organic framework (MOF) have great promising application in separation of gas mixtures. However, achieving a good interfacial compatibility between polymer and MOF is not straightforward. In this work, focusing on one of the most challenging olefin/paraffin separations: propylene /propane (C3H6/C3H8), we demonstrate that modification of the MOF filler via dopamine polymerization using a double solvent approach strongly improves interfacial compatibility. The resulting membranes show an outstanding separation performance and long-term stability with propylene permeability nearly 90 Barrer and propylene/propane selectivity close to 75. We anticipate that similar MOF modification strategies may help solve the problem of interface defects in the manufacture of MMMs and be extended to other porous fillers.
Bibliographical noteKAUST Repository Item: Exported on 2022-10-31
Acknowledgements: This article was supported by the National Natural Science Foundation of China (No. 52003250), the Excellent Youth Foundation of Henan Scientific Committee (222300420018) and Key Scientific Research Projects in Universities of Henan Province (21zx006). The authors gratefully thank Center of Advanced Analysis & Computational Science (Zhengzhou University) for help with the membrane characterization.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Environmental Engineering