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Membranes (Basel). 2016 Jun 9;6(2). pii: E31. doi: 10.3390/membranes6020031.

Preparation and Characterization of Facilitated Transport Membranes Composed of Chitosan-Styrene and Chitosan-Acrylonitrile Copolymers Modified by Methylimidazolium Based Ionic Liquids for CO₂ Separation from CH₄ and N₂.

Author information

1
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. k.v.bogacheva@mail.ru.
2
Department of Macromolecular Compounds and Colloid Chemistry, Lobachevsky State University of Nizhny Novgorod, 23 Gagarin av., Nizhny Novgorod 603950, Russia. k.v.bogacheva@mail.ru.
3
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. mochalova_ae@mail.ru.
4
Department of Macromolecular Compounds and Colloid Chemistry, Lobachevsky State University of Nizhny Novgorod, 23 Gagarin av., Nizhny Novgorod 603950, Russia. mochalova_ae@mail.ru.
5
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. yarymova.tatyana@yandex.ru.
6
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. fox-off@mail.ru.
7
Institute for Problems in Mechanical Engineering, Russian Academy of Sciences, 85 Belinskogo str., Nizhny Novgorod 603024, Russia. triboman@mail.ru.
8
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. an.vorotyntsev@me.com.
9
Research Institute for Medicines (iMed.UL), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, Lisboa 1649-003, Portugal. carlosafonso@ff.ulisboa.pt.
10
Nanotechnology and Biotechnology Department, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minina str., Nizhny Novgorod 603950, Russia. ilyavorotyntsev@gmail.com.

Abstract

CO₂ separation was found to be facilitated by transport membranes based on novel chitosan (CS)-poly(styrene) (PS) and chitosan (CS)-poly(acrylonitrile) (PAN) copolymer matrices doped with methylimidazolium based ionic liquids: [bmim][BF₄], [bmim][PF₆], and [bmim][Tf₂N] (IL). CS plays the role of biodegradable film former and selectivity promoter. Copolymers were prepared implementing the latest achievements in radical copolymerization with chosen monomers, which enabled the achievement of outstanding mechanical strength values for the CS-based membranes (75-104 MPa for CS-PAN and 69-75 MPa for CS-PS). Ionic liquid (IL) doping affected the surface and mechanical properties of the membranes as well as the gas separation properties. The highest CO₂ permeability 400 Barrers belongs to CS-b-PS/[bmim][BF₄]. The highest selectivity α (CO₂/N₂) = 15.5 was achieved for CS-b-PAN/[bmim][BF₄]. The operational temperature of the membranes is under 220 °C.

KEYWORDS:

atomic force microscopy (AFM); chitosan; copolymer; facilitated transport membranes; gas separation; ionic liquid; modification

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