▎ 摘　　要

Activated carbons obtained from polymers, Cu-containing metal-organic framework (MOP) and their composites with graphene oxide were synthesized using facile methods and tested for the selective adsorption of CO(2 )over N-2 at ambient conditions. The prepared materials have been characterized by scanning electron microscopy, X-ray diffraction analysis and N-2 adsorption. The Cu-containing metal-organic framework showed high CO2 uptakes up to 9.59 mmol g(-1) and 5.33 mmol g(-1) under 1 bar at 0 degrees C and 25 degrees C, respectively. The MOF composite with similar to 10 wt % of graphene oxide exhibited the best CO(2)adsorption selectivity over N-2 among all samples studied. Although, most graphene-containing composites feature lower CO2 adsorption capacities, they show an enhanced CO2/N-2 selectivity in comparison to the bare samples. This paper contains a comparative study of the CO2/N-2 selectivity calculated by using different methods. Additionally, CH4 adsorption, CO2/CH4 selectivity and isosteric heat of CO2 adsorption were evaluated for the selected sorbents. This study indicates that graphene-containing composites are potential materials for large-scale selective CO2 capture at ambient conditions.