title: Highly Permeable Graphene Oxide/Polyelectrolytes Hybrid Thin Films for Enhanced CO2/N2Separation Performance.
abstract: Separation of CO2from other gasses offers environmental benefits since CO2gas is the main contributor to global warming. Recently, graphene oxide (GO) based gas separation membranes are of interest due to their selective barrier properties. However, maintaining selectivity without sacrificing permeance is still challenging. Herein, we described the preparation and characterization of nanoscale GO membranes for CO2separation with both high selectivity and permeance. The internal structure and thickness of the GO membranes were controlled by layer-by-layer (LbL) self-assembly. Polyelectrolyte layers are used as the supporting matrix and for facilitating CO2transport. Enhanced gas separation was achieved by adjusting pH of the GO solutions and by varying the number of GO layers to provide a pathway for CO2molecules. Separation performance strongly depends on the number of GO bilayers. The surfaces of the multilayered GO and polyelectrolyte films are characterized by atomic force microscopy and scanning electron microscopy. The (poly (diallyldimethylammonium chloride) (PDAC)/polystyrene sulfonate (PSS)) (GO/GO) multilayer membranes show a maximum CO2/N2selectivity of 15.3 and a CO2permeance of 1175.0 GPU. LbL-assembled GO membranes are shown to be effective candidates for CO2separation based on their excellent CO2/N2separation performance.
authors.affiliation: School of Chemical Engineering & Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
authors.forename: Jiwoong
authors.initials: J
authors.lastname: Heo
authors.affiliation: School of Chemical Engineering & Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
authors.forename: Moonhyun
authors.initials: M
authors.lastname: Choi
authors.affiliation: Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea.
authors.forename: Jungyun
authors.initials: J
authors.lastname: Chang
authors.affiliation: Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea.
authors.forename: Dahye
authors.initials: D
authors.lastname: Ji
authors.affiliation: Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea. swkang@smu.ac.kr.
authors.forename: Sang Wook
authors.initials: SW
authors.lastname: Kang
authors.affiliation: School of Chemical Engineering & Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea. jkhong@cau.ac.kr.
authors.forename: Jinkee
authors.identifier: 0000-0003-3243-8536
authors.initials: J
authors.lastname: Hong