Efficient capture of CO2 over ordered micro-mesoporous hybrid carbon nanosphere

Four kinds of carbon-based adsorbents (micro-mesoporous hybrid carbon nanosphere and N-doped hollow carbon sphere with single-, double- or ruga-shell morphology) with different structural and textural properties were prepared and systematically studied in CO 2 capture. All synthesized samples possess high specific surface area (828–910 m 2  g −1 ), large pore volume (0.71–1.81 cm 3  g −1 ), and different micropore contents varied from 2.1% to 46.4%. Amongst, the ordered micro-mesoporous carbon nanosphere (OM-CNS) exhibits the best adsorption performance with CO 2 uptake as high as 3.01 mmol g −1 under conditions of 298 K and 1.0 bar, better than most of the reported CO 2 adsorbents. The excellent CO 2 adsorption capacity of OM-CNS can be reasonably attributed to the synergistic effect of ordered mesopore channels and abundant structural micropores which are beneficial for the diffusion and trapping of CO 2 adsorbate. Moreover, the OM-CNS shows excellent CO 2 trapping selectivity and superior stability and recyclability, which endow the OM-CNS as a promising and environmental-friendly adsorbent for CO 2 capture and separation under practical conditions.