▎ 摘　　要

NOVELTY - Preparing nano-composite material comprises adding graphene oxide and surface active agent into deionized water and then mixing to obtain colloidal solution, adding mesoporous graphite-type carbon nitride with the obtained colloidal solution and then ultrasonically processing and mixing nitrogen-containing compound, and stirring the mixture to form mixed solution, hydro-thermal reacting the mixed solution using PTFE lining reaction kettle and then cooling and then repeatedly washing to remove ammonia absorbed on surface of carrier material, and drying the material. USE - The method is useful for preparing nano-composite material (claimed). ADVANTAGE - The method prepares nano-composite material with high yield, short period and low cost in a simple and environment-friendly manner. DETAILED DESCRIPTION - Preparing nano-composite material comprises: (a) adding graphene oxide and surface active agent into deionized water and then uniformly mixing to obtain colloidal solution; (b) adding a mesoporous graphite-type carbon nitride with the obtained colloidal solution and then ultrasonically processing and mixing nitrogen-containing compound, and stirring the mixture at room temperature to form mixed solution; and (c) hydro-thermal reacting the mixed solution using PTFE lining reaction kettle and then naturally cooling and then repeatedly washing to remove ammonia absorbed on surface of carrier material, and drying the material. An INDEPENDENT CLAIM is included for nano-composite material prepared by method, where the nano-composite material has a diameter of 10-20 nm, specific surface area of more than 300 m2/g, and 3-8 nitrogen doped graphite alkene layers with a thickness of 9-1.5 nm.