▎ 摘　　要

A 3D porous graphene aerogel (GA) was prepared via one-step hydrothermal method and freeze-drying technology, in which organic amine reagents were used as cross-linker to combine the graphene oxide (GO) sheets. With abundant amino groups, the organic amine reagents also acted as adsorption sites to improve CO2 adsorption capacity. Morphology, pore structure and surface chemical structure of the as-prepared materials were characterized by SEM, FTIR, XRD, Raman, TG, N-2 adsorption-desorption. CO2 adsorption performance was evaluated by dynamic adsorption experiments in a fixed-bed column. Aminated by tetraethylenepentamine (TEPA), the prepared 3D graphene aerogel (TEPA-GA-3-1) achieved a CO2 adsorption capacity as high as 2.27 mmol g(-1) at 25 degrees C, 0.1 bar, which was attributed to its developed porous structure and high amino density. Further, the existence of water could improve the CO2 adsorption amount because H2O directly participates the reaction of CO2 with amine to form bicarbonates. The prepared GA adsorbent also exhibited good stability after six adsorption-desorption cycles. The above result suggests that amine-modified graphene aerogel has a potential application for CO2 capture from flue gas.