▎ 摘　　要

NOVELTY - Preparation of biomass-based porous graphene structure activated carbon, involves pulverizing the biomass into granules to obtain precursor, mixing the precursor with water to form a paste, placing the paste in a high-pressure reaction kettle to obtain pre-carbonized precursor, immersing pre-carbonized precursor in hydrochloric acid solution, washing with water to neutrality, and drying to obtain impurity-free precursor, immersing the impurity-free precursor in strong alkaline solution with solubility of 0.2-2 M, stirring, drying at 85-95 degrees C to obtain ion exchange precursor, removing impurity, placing the ion exchange precursor in atmosphere furnace, expanding and carbonizing in inert gas atmosphere at 600-1000 degrees C for 1-24 hours to obtain expanded carbonization precursor, uniformly mixing expanded carbonized precursor and strong alkaline solution in a mass ratio of 1:10-10:1, activating the pores by inert gas atmosphere at 600-1000 degrees C for 1-24 hours to obtain final product. USE - Method for preparing biomass-based porous graphene structure activated carbon used for catalysis, energy storage and gas separation applications, and supercapacitor. ADVANTAGE - The method enables preparation of biomass-based porous graphene structure activated carbon with rich pore structure, high specific surface area, excellent energy density and power density. DETAILED DESCRIPTION - Method for preparing biomass-based porous graphene structure activated carbon, involves (S1) pulverizing the biomass into granules to obtain precursor, (S2) mixing the precursor with water to form a paste, placing the paste in a high-pressure reaction kettle at 180-250 degrees C for 1-24 hours to obtain pre-carbonized precursor, (S3) immersing pre-carbonized precursor in hydrochloric acid solution with solubility of 0.2-2 M, washing with water to neutrality, and drying to obtain impurity-free precursor, (S4) immersing the impurity-free precursor in strong alkaline solution with solubility of 0.2-2 M, stirring, drying at 85-95 degrees C to obtain ion exchange precursor, removing impurity, (S5) placing the ion exchange precursor in atmosphere furnace, expanding and carbonizing in inert gas atmosphere at 600-1000 degrees C for 1-24 hours to obtain expanded carbonization precursor, (S6) uniformly mixing expanded carbonized precursor and strong alkaline solution in a mass ratio of 1:10-10:1, activating the pores by inert gas atmosphere at 600-1000 degrees C for 1-24 hours to obtain final product. The mass ratio of precursor to strong alkaline solution is 1:10-10:1.