| 초록 |
In this study, we prepared ACFs with a high specific surface area from various precursors (rayon, pitch, and oxidized polyacrylonitrile-based fibers) by a steam-activation and investigated the effects of the micropore and mesopore fraction on 2-CEES adsorption behaviors. The N2 adsorption isotherm characteristics at 77K were confirmed by BET, BJH and NLDFT equations. The adsorption capacities of the ACF were measured by breakthrough experiments in the gas phase. From the results, specific surface areas and total pore volume of the ACF were determined to be 1380–1670 m2/g and 0.61–0.82 cm3/g, respectively. It was also observed that various pore characteristics of ACF were found to be dependent on crystallite structure of each precursor. This indicates that 2-CEES adsorption capacity could be a function not only of specific surface area or total pore volume, but also of sub-mesopore volume fraction in the range of 1.5–2.5 nm of adsorbents. |
