Chitosan/Ag(I) thin-film composite membranes with high CO/N2 separation performance by facilitated transport: Effect of preparation and operation conditions

[Display omitted] •Highly CO-selective chitosan-Ag(I) thin-film composite membrane was fabricated.•The π-complexation of CO with the Ag+ ions was confirmed.•CO/N2 separation performances were analyzed under pure and mixed gas conditions.•The highest CO/N2 separation performance among previous report...

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Bibliographic Details
Published in:Separation and purification technology 2024-01, Vol.328, p.124931, Article 124931
Main Authors: Bin Min, Su, Kang, Miso, Han, Yu-Jeong, An, Isaac, Ryoung Park, Bo, Hak Kim, Jong, Kim, Jeong-Hoon
Format: Article
Language:English
Subjects:
chitosan-Ag(I)
CO/N2 separation
Facilitated transport
Thin-film composite membrane
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Summary:[Display omitted] •Highly CO-selective chitosan-Ag(I) thin-film composite membrane was fabricated.•The π-complexation of CO with the Ag+ ions was confirmed.•CO/N2 separation performances were analyzed under pure and mixed gas conditions.•The highest CO/N2 separation performance among previous reports was obtained. CO/N2 separation is an important process in scientific and industrial fields to address economic and environmental concerns. In this paper, we report chitosan (CS)/Ag(I) thin-film composite membranes with high CO/N2 separation performance by introducing AgNO3 as the CO carrier into a CS selective layer coated on the microporous polysulfone support. Gas separation performances of CS/Ag(I) composite membranes were systematically investigated under humidified conditions by adjusting the AgNO3 content and thickness of the selective layer. The highest CO/N2 selectivity of 19.7 with CO permeance of 13.2 GPU was observed for the 0.25 μm-thick CS/Ag(I) composite membranes with 5 M AgNO3 content. The optimized CS/Ag(I)-3M composite membranes exhibited CO purity of 87–97%, depending on the CO/N2 feed composition (50/50–80/20 mol.%). To the best of our knowledge, the CS/Ag(I) composite membranes fabricated herein exhibited the highest CO/N2 separation performance among the reported CO separation membranes. Furthermore, the insights on CO/N2 separation performance for various operation conditions gained in this work can provide important guidance for CO separation applications.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2023.124931