1--Butyl-3-methylimidazolium hexafluorophosphate, [BMIM][PF], and its methylated form, 1--butyl-2,3-dimethylimidazolium hexafluorophosphate, [BMMIM][PF], were incorporated into CuBTC to examine the effect of methylation of ionic liquids (ILs) on the gas separation performance of the corresponding IL/metal-organic framework (MOF) composites. Spectroscopic analysis revealed that the interactions of the methylated ILs with CuBTC were weaker compared to those of its non-methylated counterpart. Gas uptake measurements illustrated that this difference in the interactions influences the gas separation performance of the composites. Accordingly, the CO/N: 15/85 and CH/N: 50/50 selectivities increased by 37% and 60% for [BMMIM][PF]/CuBTC and 34% and 50% for [BMIM][PF]/CuBTC, respectively, compared to the corresponding selectivities of pristine CuBTC at 1000 mbar. The results revealed another structural parameter controlling the performance of the IL/MOF composites, a novel type of material with rapidly expanding application areas.
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| http://dx.doi.org/10.1039/c8ce01364k | DOI Listing |
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