Preparation and CO2 Separation Properties of PVDF/[Bmim][PF6]/ZIF-8 Mixed Matrix Membranes

doi:10.12068/j.issn.1005-3026.2025.20230337

Abstract

Abstract:

Mixed matrix membranes （MMMs） have an extensive application prospect in the field of CO₂ separation with good processing property and high efficiency for separation. To prepare mixed matrix membranes， ZIF-8 was prepared through solvothermal methods. ZIF-8 and ［Bmim］［PF₆］ were used as the dispersed phase， and polyvinylidene fluoride （PVDF） was served as a continuous phase. The physical and chemical properties of MMMs were characterized by BET， SEM， TEM， FT-IR， TG and mechanical property testing. The effects of ZIF-8 content and transmembrane pressure on the CO₂ separation performance of the membranes were studied， and the long-time stability of membranes was investigated. The results show that the best CO₂ permeability of MMMs is 679.26×10^-7 cm³·cm·cm^-2·s^-1·MPa^-1 with the CO₂/N₂ selectivity of 40.33 when mass fraction of ZIF-8 loaded on the PVDF is 15%， and it shows excellent CO₂ separation performance.

Key words: mixed matrix membranes（MMMs）, CO₂ separation, ZIF-8, ionic liquid, polyvinylidene fluoride（PVDF）

CLC Number:

TS 174

Jing-xian LIU, Bin WANG, Mian ZHU, Wei-dong HE. Preparation and CO₂ Separation Properties of PVDF/[Bmim][PF₆]/ZIF-8 Mixed Matrix Membranes[J]. Journal of Northeastern University(Natural Science), 2025, 46(6): 113-121.

Figures/Tables 15

Fig.1 Preparation schematic of MMMs

Table 1 Composition of casting solution

名称	m/g
名称	PVDF	[Bmim][PF₆]	ZIF-8	DMF
P-0	2.8	—	—	17.20
PZ-0	2.8	—	0.42	16.78
PBZ-0	2.8	1.4	—	15.80
PBZ-5	2.8	1.4	0.14	15.66
PBZ-10	2.8	1.4	0.28	15.52
PBZ-15	2.8	1.4	0.42	15.38
PBZ-20	2.8	1.4	0.56	15.24

Fig.2 Schematic of gas separation performance testing

Fig.3 Microcosmic appearance of ZIF-8

Fig.4 TG curves of ZIF-8 and [Bmim][PF6]

Fig.5 FT-IR characterization of ZIF-8 and [Bmim][PF6]

Fig.6 N2 sorption isotherm and pore size distribution of ZIF-8

Fig.7 SEM image of MMMs surface

Fig.8 TG and DTG curves of MMMs

Fig.9 FT-IR spectrogram of MMMs

Fig.10 Characterization of mechanical property of MMMs

Fig.11 Effect of ZIF-8 content on CO2/N2 separation performance of the MMMs

Fig.12 Effect of transmembrane pressure on CO2/N2 separation performance of the MMMs

Fig.13 The stability of PBZ-15 MMMs

Fig.14 Comparison of CO2/N2 separation performance of the MMMs

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Preparation and CO₂ Separation Properties of PVDF/[Bmim][PF₆]/ZIF-8 Mixed Matrix Membranes

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