Facile synthesis of amine-functionalized three-dimensional graphene composites for CO2 capture

Excessive emissions of carbon dioxide (CO2) cause the greenhouse effect. CO2 capture and storage has been recognized as an important solution for reducing carbon dioxide emissions and coping with global warming. The synthesis of porous materials for effective CO2 adsorption is considered to be one of the most possible methods for CO2 capture and storage at present, however, achieving selective and efficient CO2 adsorption and conversion is still quite a challenge. Herein, a series of three-dimensional graphenebased materials (3D GBMs) were synthesized by alkali metal involved method, which showed high specific surface area (477.56 m(2) g(-1)-792.96 m(2) g(-1)) and abundant micropore and mesopore surface structures. We demonstrated that introducing N-containing or O-containing functional groups into the carbon framework can create more surface microporous structures and active adsorption sites, and significantly enhance the CO2 adsorption performance of 3D GBMs. Furthermore, it was found that the simultaneously introduction of the two kinds of functional groups into 3D GBMs could further increase the adsorption capacity of CO2 (from 2.06 mmol g-1 to 4.79 mmol g(-1)). All the above results indicate the treated 3D GBMs could have a great potential as efficient adsorbent in CO2 capture and storage.