| 초록 |
Metal organic framework (MOF) is highly porous nanomaterial consisted of metal ions and organic ligands. MOF has drawn attention in gas separation areas through specific gas adsorption and size sieving. Zeolitic imidazolate framework (ZIF) membranes, a subclass of MOF, have been regarded as attractive candidates for CO2 separation due to their high porosity and high CO2 adsorption capacity. In particular, recent studies incorporated ZIF-8 into polymer membranes to improve gas transport properties and operational stability. However, aggregation of ZIF particles hinders the practical performance so that high loading of ZIF is required. In this work, we maximized the enhancement of gas separation property at low ZIF-8 concentration as 0.02 wt.% by coordinating ZIF-8 particles onto two-dimensional porous grapheme oxide plane. Thin ZIF-polymer composite membrane which was prepared by growing ZIF-8/PGO on porous substrate showed increased CO2 permeability and CO2/N2 permselectivity. |
