Poly(ethylene oxide)-Based Copolymer-IL Composite Membranes for CO 2 Separation
Poly(ethylene oxide) (PEO)-based copolymers are at the forefront of advanced membrane materials for selective CO 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 co...
Saved in:
Published in | Membranes (Basel) Vol. 13; no. 1 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
25.12.2022
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Poly(ethylene oxide) (PEO)-based copolymers are at the forefront of advanced membrane materials for selective CO
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 CO
permeability improvement and effective CO
/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)
) 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 CO
permeability of 46.1 Barrer and ideal CO
/H
and CO
/CH
selectivities of 5.6 and 39.0, respectively, at 30 °C. In addition, almost all composite membranes surpassed the upper bound limit for CO
/H
separation. The above membrane showed the highest water vapor permeability value of 50,000 Barrer under both wet and dry conditions and a corresponding H
O/CO
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 CO
gas streams. |
---|---|
ISSN: | 2077-0375 2077-0375 |