Kim
and co-workers reported that the CO2 adsorption capacities
of mesoporous materials can be improved by surface amino
modification [7]. MacGibbon and co-workers applied organic
groups to modify the adsorbents, which improved the adsorption
capacities of CH4 substantially [8]. Bae et al. [9] investigated
the adsorption properties of different adsorbates on
carbon sieves systematically.