0553839 - ÚCHP 2022 RIV CH eng J - Journal Article
Jain, A. - Ahmad, M.Z. - Linkes, A. - Martin-Gil, V. - Castro-Munoz, R. - Izák, Pavel - Šofer, Z. - Hintz, W. - Fíla, V.
6FDA-DAM: DABA Co-Polyimide Mixed Matrix Membranes with GO and ZIF-8 Mixtures for Effective CO2/CH4 Separation.
Nanomaterials. Roč. 11, č. 3 (2021), č. článku 668. ISSN 2079-4991. E-ISSN 2079-4991
R&D Projects: GA MŠMT(CZ) EF16_026/0008413
Institutional support: RVO:67985858
Keywords : 6FDA-polyimide * mixed matrix membranes * ZIF-8/GO
OECD category: Chemical process engineering
Impact factor: 5.719, year: 2021 ; AIS: 0.738, rok: 2021
Method of publishing: Open access
Result website:
https://www.mdpi.com/2079-4991/11/3/668DOI: https://doi.org/10.3390/nano11030668

This work presents the gas separation evaluation of 6FDA-DAM:DABA (3:1) co-polyimide and its enhanced mixed matrix membranes (MMMs) with graphene oxide (GO) and ZIF-8 (particle size of <40 nm). The 6FDA-copolyimide was obtained through two-stage poly-condensation polymerization, while the ZIF-8 nanoparticles were synthesized using the dry and wet method. The MMMs were preliminarily prepared with 1-4 wt.% GO and 5-15 wt.% ZIF-8 filler loading independently. Based on the best performing GO MMM, the study proceeded with making MMMs based on the mixtures of GO and ZIF-8 with a fixed 1 wt.% GO content (related to the polymer matrix) and varied ZIF-8 loadings. All the materials were characterized thoroughly using TGA, FTIR, XRD, and FESEM. The gas separation was measured with 50:50 vol.% CO2:CH4 binary mixture at 2 bar feed pressure and 25 degrees C. The pristine 6FDA-copolyimide showed CO2 permeability (P-CO2) of 147 Barrer and CO2/CH4 selectivity (alpha(CO2/CH4)) of 47.5. At the optimum GO loading (1 wt.%), the P-CO2 and alpha(CO2/CH4) were improved by 22% and 7%, respectively. A combination of GO (1 wt.%)/ZIF-8 fillers tremendously improves its P-CO2, by 990% for GO/ZIF-8 (5 wt.%) and 1.124% for GO/ZIF-8 (10 wt.%). Regrettably, the MMMs lost their selectivity by 16-55% due to the non-selective filler-polymer interfacial voids. However, the hybrid MMM performances still resided close to the 2019 upper bound and showed good performance stability when tested at different feed pressure conditions.
Permanent Link: http://hdl.handle.net/11104/0328515