American Chemical Society
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Core–Shell Type Ionic Liquid/Metal Organic Framework Composite: An Exceptionally High CO2/CH4 Selectivity

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Version 2 2018-08-03, 16:19
Version 1 2018-07-18, 14:29
journal contribution
posted on 2018-07-13, 00:00 authored by Muhammad Zeeshan, Vahid Nozari, M. Baris Yagci, Tugba Isık, Ugur Unal, Volkan Ortalan, Seda Keskin, Alper Uzun
Here, we present a new concept of a core–shell type ionic liquid/metal organic framework (IL/MOF) composite. A hydrophilic IL, 1-(2-hydroxyethyl)-3-methylimidazolium dicyanamide, [HEMIM]­[DCA], was deposited on a hydrophobic zeolitic imidazolate framework, ZIF-8. The composite exhibited approximately 5.7 times higher CO2 uptake and 45 times higher CO2/CH4 selectivity at 1 mbar and 25 °C compared to the parent MOF. Characterization showed that IL molecules deposited on the external surface of the MOF, forming a core (MOF)–shell (IL) type material, in which IL acts as a smart gate for the guest molecules.