Poly(ethylene oxide)-Based Copolymer-IL Composite Membranes for CO₂ Separation.

Content Provider	Europe PMC
Author	Vroulias, Dionysios Staurianou, Eirini Ioannides, Theophilos Deimede, Valadoula
Editor	Lee, Won Hee
Copyright Year	2022
Abstract	Poly(ethylene oxide) (PEO)-based copolymers are at the forefront of advanced membrane materials for selective CO2 separation. In this work, free-standing composite membranes were prepared by blending imidazolium-based ionic liquids (ILs) having different structural characteristics with a PEO-based copolymer previously developed by our group, targeting CO2 permeability improvement and effective CO2/gas separation. The effect of IL loading (30 and 40 wt%), alkyl chain length of the imidazolium cation (ethyl- and hexyl- chain) and the nature of the anion (TFSI-, C(CN)3-) on physicochemical and gas transport properties were studied. Among all composite membranes, PEO-based copolymer with 40 wt% IL3-[HMIM][TFSI] containing the longer alkyl chain of the cation and TFSI- as the anion exhibited the highest CO2 permeability of 46.1 Barrer and ideal CO2/H2 and CO2/CH4 selectivities of 5.6 and 39.0, respectively, at 30 °C. In addition, almost all composite membranes surpassed the upper bound limit for CO2/H2 separation. The above membrane showed the highest water vapor permeability value of 50,000 Barrer under both wet and dry conditions and a corresponding H2O/CO2 ideal selectivity value of 1080; values that are comparable with those reported for other highly water-selective PEO-based polymers. These results suggest the potential application of this membrane in hydrogen purification and dehydration of CO2 gas streams.
Volume Number	13
PubMed Central reference number	PMC9863429
Issue Number	1
PubMed reference number	36676833
Journal	Membranes (Basel)
e-ISSN	20770375
DOI	10.3390/membranes13010026
Language	English
Publisher	MDPI
Publisher Date	2022-12-25
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2022 by the authors.
Subject Keyword	PEO-based copolymers polymer-IL composite membranes CO2 permeability water vapor permeability CO2/CH4 selectivity CO2/H2 selectivity
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering Process Chemistry and Technology Filtration and Separation