▎ 摘　　要

NOVELTY - Preparing graphene by using g-C3N4 as a template comprises mixing a carbon-containing compound solution and a nitrogen-rich compound solution to obtain a mixed solution, adding a metal salt solution to the mixed solution, mixing and stirring to obtain a solution to be reacted, removing the solvent in the solution, collecting the solid product, grinding into a powder to obtain a powdery product, heating the powdered product to 500-600 degrees C in an atmosphere and maintaining the temperature for 0.5-2 hours, heating to 800-1100 degrees C, incubating for 0.5-2 hours to obtain a pyrolysis product, washing the pyrolysis product and drying. USE - The method is useful for preparing graphene by using g-C3N4 as a template.