Preparation method of nitrogen-doped graphene material

The invention relates to a preparation method of a nitrogen-doped graphene material. The preparation method comprises the following steps: adding a micro-molecule fatty amine water solution into a water solution of graphite oxide dispersed by ultrasound, performing hydrothermal reaction for 36-72 hours, separating out precipitate, washing and drying to obtain the nitrogen-doped graphene material. The material containing nitrogen and carbon prepared by the preparation method is high in nitrogen content, and contains different nitrogen species such as secondary amine and pyridine nitrogen, so that the surface of the prepared material has alkali centers with different intensities, wherein the secondary amine is super base. In addition, the proportion and content of nitrogen species can be controlled by changing the species of micro-molecule amine, so that the effect of controlling the alkalinity and the alkali amount of a catalyst is achieved. The actual operation of the method is simple and feasible, and the preparation material does not contain any metal element, so the nitrogen-doped graphene material is a green environment-friendly catalyst. Good catalytic activity is shown in Michael addition reaction and ester exchange reaction, and the catalyst is in favor of separation and purification of products, so the catalyst has a potential industrial application value.