Influence of ionic liquid-like cationic pendants composition in cellulose based polyelectrolytes on membrane-based CO 2 separation.

Autor: Nikolaeva D; Membrane Technology Group (MTG), cMACS, Faculty Bio-science Engineering, Celestijnenlaan 200F, 3001 Leuven, Belgium; UCLouvain - IMMC, Materials & Process Engineering, Place Sainte Barbe 2, 1348 Louvain-la-Neuve, Belgium. Electronic address: daria.nikolaeva@uclouvain.be., Verachtert K; Membrane Technology Group (MTG), cMACS, Faculty Bio-science Engineering, Celestijnenlaan 200F, 3001 Leuven, Belgium., Azcune I; Fundación CIDETEC, Paseo Miramon 196, 20014 Donostia, San Sebastian, Spain., Jansen JC; Institute on Membrane Technology (ITM-CNR), Via P. Bucci 17/C, 87036 Rende (CS), Italy., Vankelecom IFJ; Membrane Technology Group (MTG), cMACS, Faculty Bio-science Engineering, Celestijnenlaan 200F, 3001 Leuven, Belgium.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2021 Mar 01; Vol. 255, pp. 117375. Date of Electronic Publication: 2020 Nov 10.
DOI: 10.1016/j.carbpol.2020.117375
Abstrakt: Cellulose acetate (CA) is an attractive membrane polymer for CO 2 capture market. However, its low CO 2 permeability hampers its application as part of a membrane for most relevant types of CO 2 containing feeds. This work investigates the enhancement of CA separation performance by incorporating ionic liquid-like pendants (1-methylimidazol, 1-methylpyrrolidine, and 2-hydroxyethyldimethylamine (HEDMA) on the CA backbone. These CA-based polyelectrolytes (PEs), synthesised by covalent grafting of cationic pendants with anion metathesis, were characterised by NMR, FTIR, DSC/TGA, and processed into thin-film composite membranes. The membrane performance in CO 2 /N 2 mixed-gas permeation experiments shows a decrease in CO 2 and N 2 permeability and an initial decrease and then gradual increase in CO 2 /N 2 selectivity with increasing HEDMA content. The amount of HEDMA attached to the CA backbone determines overall separation process in bifunctional PEs. This indicates that the hydroxy-substituted cationic pendants alter interactions between PEs network and permeating CO 2 molecules, suggesting possibilities for further improvements.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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