Abstract
Although having shown promising prospects in diverse gas separations, sustainable fabrication of high-performance metal-organic framework (MOF) membranes remains a significant challenge towards applications. In the present work, epitaxial supercritical fluid (SCF) processing was developed for preparing highly C3H6-permselective ZIF-8 membranes through depositing ZIF-8 seed layers followed by epitaxial supercritical growth in supercritical CO2 (scCO2) environments. Our results indicated that maintaining scCO2 in the gas-like region was indispensable for preparing ZIF-8 membranes with desired microstructure and superior C3H6/C3H8 separation (i.e., C3H6 permeance and C3H6/C3H8 selectivity). Simultaneously, unreacted 2-methylimidazole ligands could be fully recycled and reutilized after epitaxial SCF processing. The present study sheds light on the future prospects for sustainable production of versatile high-performance MOF membranes.
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