| 초록 |
Nanoporous carbons (NPCs) such as charcoal and activated carbons are commonly used for CO2 absorbants owing to their high surface area and high porosity. Such NPCs can be also prepared in the membrane platforms, showing high permeability and selectivity as compared to conventional polymeric membranes. Recently, a fascinating two-dimensional nanocarbon, i.e., graphene and its derivatives (e.g., graphene oxide (GO) and reduced GO) have been considered as nano-building blocks for architecting new membranes for fast and selective gas separation, if pore size and its distribution were properly engineered. Among them, GO consisting of many oxygen-containing functional groups such as ether, hydroxyl and carboxylic group on the basal planes and at the edges, showed unusual CO2 separation properties when they are prepared as ultrathin membranes. Here, we are interested in CO2 sorption behavior of GO and its derivatives in the various forms (e.g., powders, sponges and thick membranes). In this study, we synthesized GO and its derivative material by modification, and performed the gas sorption measurements using CO2 and other gases. We will describe different CO2 sorption behaviors depending on the specific oxygen functional groups of GO and GO membranes. |
