| 초록 |
A mixed linker approach is one of effective routes to fine-tune separation properties of MOFs by involving two or more ligands in a single framework. In this contribution, we attempt to synthesize mixed ligand ZIF-8 analogue membranes by adding 2, 4-dimethylimidazole (dmIm) into ZIF-8 (Zn2+/2-methylimidazole), aiming at adjusting molecular sieving effect of a ZIF-8 membrane. Gradual addition of dmIm caused dramatic alterations in framework flexibility and propylene and propane adsorption characteristics. When mixed linker membranes were produced, dmIm addition was accompanied by reduction in propylene and propane permeance presumably due to framework densification. Noticeably, a analogue membrane including ~10 mol% of dmim exhibited remarkably high propylene/propane separation factor of ~180, which could not be achieved by counterpart ZIF-8 membranes within our trials. |
