Carrier-driving CO2 separation by amine-rich membranes with intercalated graphene oxide.
In: Journal of Membrane Science, Jg. 706 (2024-07-01), S. N.PAG
academicJournal
Zugriff:
Amine-rich facilitated transport membranes (FTMs) attract great interest in intensifying the membrane-based CO 2 separation processes. The high-molecular-weight polyvinylamine (PVAm) polymers containing fixed-site carriers of the amino groups were used to prepare highly CO 2 -permeable membranes. The sterically hindered PVAm polymers of poly(N-methyl-N-vinylamine) and poly(N-isopropyl-N-vinylamine) were obtained by functionalization of PVAm to provide superior CO 2 solubility. By loading the mobile carriers of amino acid salt (AAS) and CO 2 -philic graphene oxide (GO), the prepared FTMs render enhanced CO 2 permeance and CO 2 /N 2 selectivity. The d-spacing of 8.8 Å and the ultramicropores of 3.5 Å from GO nanosheets provide the combination of both selective surface flow and molecular sieving mechanisms to achieve improved CO 2 permeance and CO 2 /N 2 selectivity. In addition, the intercalation of GO hinders N 2 transport through the membrane due to a longer pathway, while the mobile carriers of AAS introduced into the PVAm matrix facilitate CO 2 transport through the selective layer. Therefore, the CO 2 /N 2 selectivity of the prepared FTMs was significantly enhanced to 171 based on the intensified carrier-driving transport mechanism. It can be concluded that amine-rich membranes based on both fixed and mobile carriers of the amino groups together with intercalated GO can synergistically improve the CO 2 /N 2 separation performance, and be potentially applied for CO 2 capture from flue gas. [Display omitted] • Functionalization of sterically hindered polyvinylamine for the enhancement of CO 2 -carrier facilitated transport. • Intercalated graphene oxide nanosheets with 3.5 and 8.8 Å micropores provide selective surface flow and molecular sieving mechanism for CO 2 transport. • Amine-rich composite membranes with fixed-site and mobile carriers present a superior CO 2 /N 2 selectivity of 171. [ABSTRACT FROM AUTHOR]
Titel: |
Carrier-driving CO2 separation by amine-rich membranes with intercalated graphene oxide.
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Autor/in / Beteiligte Person: | Li, Yang ; Dekel, Dario R. ; He, Xuezhong |
Zeitschrift: | Journal of Membrane Science, Jg. 706 (2024-07-01), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0376-7388 (print) |
DOI: | 10.1016/j.memsci.2024.122960 |
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