▎ 摘　　要

NOVELTY - Preparing composite material involves oxidizing grafite by ultrasonic wave to obtain oxidized graphite alkene solution (1-8mg/mL). The obtained oxidized graphite alkene solution and polyethylenimine solution (5-40mg/mL) are mixed in ratio of 1:0.3-3 to obtain graphene oxide and polyethylenimine solution mixture by crosslinking reaction. Activated carbon fiber (5-10g) is dipped with concentrated nitric acid (500mL) and sonicated. Deionized water is removed from the mixture and pH is adjusted to 5-6. The mixture is dried at 70-80 degrees C. USE - Method for preparing composite material (claimed). ADVANTAGE - The method enables to prepare composite material in simple and eco-friendly manner. DETAILED DESCRIPTION - Preparing composite material involves oxidizing grafite by ultrasonic wave to obtain oxidized graphite alkene solution (1-8mg/mL). The obtained oxidized graphite alkene solution and polyethylenimine solution (5-40mg/mL) are mixed in ratio of 1:0.3-3 to obtain graphene oxide and polyethylenimine solution mixture by crosslinking reaction. Activated carbon fiber (5-10g) is dipped with concentrated nitric acid (500mL) and sonicated. Deionized water is removed from the mixture and pH is adjusted to 5-6. The mixture is dried at 70-80 degrees C. The obtained pre-impregnated activated carbon fiber is mixed with obtained graphene oxide and polyethylenimine solution mixture and dried at 70-80 degrees C. Surface area of the obtained composites is 1400-1600m2/g. The composite material has pore diameter 1-4.5nm and pore size of 0.5-2nm.