Fig. 1. Schematic diagram of radiation grafting and membrane growth of DMOF

Fig. 2. SEM images of different substrates：(a) untreated PP substrate; (b) chromic acid treated PP substrate; (c) radiation treated PP substrate

Fig. 3. (a),(b),(c) Morphological characterization of DMOF crystal powder; (d),(e),(f) pore morphology on DMOF membrane; (g),(h),(i) fiber morphology on DMOF membrane

Fig. 4. EDS images: (a) DMOF powder; (b) DMOF membrane

Fig. 5. SEM images of DMOF membranes grown on nonwoven substrates treated with different absorption doses: (a) 12 kGy; (b) 24 kGy; (c) 60 kGy

Fig. 6. Morphology of DMOF membranes grown with different monomer concentrations: (a) 105 mmol/L; (b) 210 mmol/L; (c) 315 mmol/L; (d) 420 mmol/L

Fig. 7. Infrared spectrum analysis of DMOF powder and DMOF membrane

Fig. 8. Infrared spectra of DMOF membranes synthesized at different time and maleic anhydride grafted non-woven fabric (control)

Fig. 9. X-ray diffraction spectras of DMOF standard card,DMOF powder,DMOF membrane,and non-woven fabric

Fig. 10. Nitrogen adsorption-desorption isotherms of DMOF powder (a) and results from DFT model calculations (b)

Fig. 11. Nitrogen adsorption-desorption isotherms of DMOF membrane (a) and results from DFT model calculation (b)

Fig. 12. Adsorption-desorption isotherms of light hydrocarbons on DMOF powder (a); adsorption-desorption isotherms of light hydrocarbons on DMOF membrane (b)

Fig. 13. IAST calculated the selectivity of DMOF powder for C₂H₆/CH₄ (a) and C₃H₈/CH₄ (b); DMOF membrane selectivity for C₂H₆/CH₄ (c) and C₃H₈/CH₄ (d)