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

• DOI: 10.1021/jacs.8b05802
• Publication Date: 2018-07-13T22:26:49Z
• Authors: Muhammad Zeeshan; Vahid Nozari; M. Baris Yagci; Tugba Isık; Ugur Unal; Volkan Ortalan; Seda Keskin; Alper Uzun
• Keywords: Dicyanamide; Zeolitic imidazolate framework; Imidazolate

Here, we present a new concept of 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 hydrophobic zeolitic imidazolate framework, ZIF-8. The composite exhibited approximately 5.7 times higher CO2 uptake and 45 CO2/CH4 selectivity at 1 mbar 25 °C compared to the parent MOF. Characterization showed that IL molecules external surface MOF, forming core (MOF)–shell (IL) material, in which acts as smart gate for guest molecules.