Abstract
• Two protic ionic liquids/Pebax blended membranes were developed for CO 2 separation. • [TMGH][Im]/Pebax blended membrane showed better CO 2 permeability and selectivity. • Gas permeability increased and CO 2 selectivity declined at higher temperatures. The separation of carbon dioxide (CO 2 ) is of great importance for environment protection and gas resource purification. The ionic liquids (ILs)-based gas separation membrane provides a new chance for efficient CO 2 separation, while high permeability and selectivity of membranes is a great challenge. In this study, the influence of two protic ILs with different anion ([TMGH][Im] and [TMGH][PhO]) on the CO 2 separation performance of the prepared ILs/Pebax blended membranes were systematically investigated at different temperature. The results showed the CO 2 permeability exhibits the rising trend for ILs/Pebax blended membranes with the increment of IL content. Especially, the [TMGH][Im] with low viscosity and high CO 2 absorption capacity leads to the blended membranes showing better CO 2 permeability and ideal CO 2 selectivity than that of membranes with [TMGH][PhO] at high IL content. Besides, with operating temperature increasing, the gas permeability of 20% (mass) [TMGH][Im]/Pebax blended membrane increases due to the decreasing viscosity of IL and the rising chain mobility of polymer. Inversely, the gas selectivity shows decreasing trend because CO 2 absorption capacity obviously decreased at higher temperature.
Published Version
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