Combined Effect of CNTs with ZIF-302 into Polysulfone to Fabricate MMMs for Enhanced CO2 Separation from Flue Gases

摘要

Multiwalled CNTs and zeolitic imidazole frameworks (ZIF-302) were collegially incorporated into glassy polysulfone (PSF) to prepare mixed-matrix membranes (MMMs) to separate CO_2 from post- combustion flue gas stream. Varying loadings of both nanofillers were incorporated into PSF using solution-casting technique to optimize CO_2 separation performance of MMMs under dry and wet conditions. The flexible MMMs rendered homogeneous dispersion of fillers, improved polymer-filler adhesion, and thermally stable structure. Gas sorption analyses along with dry and wet gas permeation experiments demonstrated improved CO_2 permeability and CO_2/N_2 ideal selectivity of MMMs owing to collegial effect of nanofillers. The composite membrane containing 8wt% CNTs and 12wt% ZIF-302 nanofillers showed an optimum separation performance by providing a CO_2 permeability of 18 Barrers with CO_2/N_2 selectivity of 35. The permeation features of MMMs were slightly improved under humid conditions as compared to dry ones.