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6FDA-DAM: DABA Co-Polyimide Mixed Matrix Membranes with GO and ZIF-8 Mixtures for Effective CO2/CH4 Separation.
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SYSNO ASEP 0553839 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 6FDA-DAM: DABA Co-Polyimide Mixed Matrix Membranes with GO and ZIF-8 Mixtures for Effective CO2/CH4 Separation. Author(s) Jain, A. (CZ)
Ahmad, M.Z. (CZ)
Linkes, A. (CZ)
Martin-Gil, V. (CZ)
Castro-Munoz, R. (CZ)
Izák, Pavel (UCHP-M) RID, ORCID, SAI
Šofer, Z. (CZ)
Hintz, W. (DE)
Fíla, V. (CZ)Article number 668 Source Title Nanomaterials. - : MDPI
Roč. 11, č. 3 (2021)Number of pages 16 s. Language eng - English Country CH - Switzerland Keywords 6FDA-polyimide ; mixed matrix membranes ; ZIF-8/GO Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects EF16_026/0008413 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UCHP-M - RVO:67985858 UT WOS 000634002800001 EID SCOPUS 85102043231 DOI 10.3390/nano11030668 Annotation 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. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address https://www.mdpi.com/2079-4991/11/3/668
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