▎ 摘　　要

NOVELTY - Carbon dioxide adsorption material obtained by activating the carbon material in an acidic system for plasma modification, where the carbon material is a mixture of carbon nanotubes, graphene and/or activated carbon, is claimed. USE - Used as carbon dioxide adsorption material. ADVANTAGE - The carbon dioxide adsorption material has an increase in the number of surface micropores, a decrease in the surface pore size, and a significant improvement in its carbon dioxide adsorption capacity, increases the number of nitrogen-containing functional groups of the carbon nanotube material through plasma modification, hence the electron density on the carbon surface increases, and the surface polarity increases, thus increasing the carbon dioxide adsorption capacity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the carbon dioxide adsorption material, comprising (i) adding nitric acid dropwise to the carbon material dispersion until the pH of the dispersion is 3, and reacting for 1-2 hours; (ii) washing and drying the carbon material processed in the step (i); (iii) fully mixing the carbon material and glass beads obtained in the step (ii), and placing them in a reaction chamber of plasma modification device; and (iv) keeping helium volume at 10% of the total volume of the mixed gas, mixing nitrogen and oxygen in a volume ratio of (0.2-0.8):1 and then placing it into plasma for modification In the reaction chamber of the device, where the flow rate of the mixed gas is 10-40 ml/minute, the input voltage is 10-40 kV, and the treatment time is 10-60 minutes. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of plasma modification of the carbon material. 1Nitrogen source 2Argon gas source 3Helium gas source 4Polytetrafluoroethylene pipeline 5Mass flow meter 6Gas mixing tank 7Plasma generator 8High voltage power supply 9Oscillograph