Abstract
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.
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