▎ 摘　　要

NOVELTY - Core-shell structure three-dimensional graphene composite material comprises metal organic frame zeolitic imidazolate framework (ZIF-8) as core, three-dimensional structure of graphene nitrogen as shell, through electrostatic attraction to form core-shell structure three-dimensional composite material, the mass ratio of the three-dimensional structure graphene the organic frame ZIF-8 and nitrogen is 5:1-15:1. USE - The material is useful for capacitive desalting electrode (claimed). ADVANTAGE - The method: is quick, simple and economical; and produces in batches. The material has high specific surface area, good conductivity and wettability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the material comprising (i) mixing zinc nitrate hexahydrate and 2-methylimidazole according to 1:3-1:8, dissolving in methanol solution, where the concentration of the zinc nitrate is 1-3 wt.%, stirring at rotating speed of 350-500 revolution/minute (rpm), lowering stirring speed after fully and uniformly mixing, centrifugal separating, washing with methanol and drying to obtain metal organic frame ZIF-8, (ii) dispersing the metal organic framework ZIF-8 in 0.1-0.3% graphite oxide aqueous solution, stirring, drying, placing into tube furnace under inert atmosphere of nitrogen or argon, controlling heating speed at 2-4 degrees C/minute, firstly raising temperature to 800 degrees C, heat preserving for 3-4 hours and then cooling to room temperature to obtain the carbon material, where mass ratio of the metal organic framework ZIF-8 and graphite oxide is 5:1-15:1, and (iii) adding the carbon material into 2 mol hydrochloric acid or sulfuric acid solution, fully stirring and reacting for 8-12 hours, where the mass ratio of the carbon material to acid solution is 1:70-1:100, fully washing and drying to obtain the core-shell structure composite three-dimensional graphene composite material.