Enhanced C₃H₆/C₃H₈ separation performance in polysulfone membrane blended with rigid ZIF-8 crystals

Abstract

Metal-organic frameworks have a wide range of applications in the field of membrane separation, but the inherent flexible structure and the difficulty for scale-up hinder their further applications. Herein, the relatively rigid zeolitic imidazolate framework-8 particles prepared under an electric field (E-ZIF-8) were used as the fillers in polysulfone (PSF) to form series of mixed matrix membranes. It was found that the introduction of E-ZIF-8 improves both the C₃H₆ permeability and C₃H₆/C₃H₈ selectivity of the membranes. Compared with the bare PSF membrane, the C₃H₆/C₃H₈ selectivity of the 30 wt % E-ZIF-8@PSF membrane increased by ~230%, while the C₃H₆ permeability was enhanced by ~830%. In addition, time and pressure dependence analysis demonstrated that such E-ZIF-8@PSF membranes also exhibited good long-term stability and pressure resistance, offering significant industrialization advantages.

Graphical abstract

Keywords

gas separation / metal-organic frameworks / mixed matrix membranes

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