▎ 摘　　要

NOVELTY - Graphitic carbon nitride (g-C3N4) composite material comprises titanium dioxide material, graphene material and graphitic carbon nitride material. The g-C3N4 material is a sheet material. The titanium dioxide material is titanium dioxide nanoparticles. The g-C3N4 material is distributed on the surface of the graphene material. The titanium dioxide material is distributed on the surface of the graphene material. The thickness of the g-C3N4 material is 15-300 nm, and the length is 50-1000 nm. The length of the graphene is 500-3000 nm. The diameter of the titanium dioxide nanoparticles is 30-50 nm. USE - The composite material is useful for soil repairing in the field of light degradation (claimed). ADVANTAGE - The composite material: utilizes graphene material and gC3N4 material having large specific surface area to achieve adsorption of large organic particles; enables graphene materials, gC3N4 materials and titanium dioxide materials to form heterojunction; ensures degradation of organic pollutants in the soil; and degrades pollutants in soil at the rate of more than 90% after 4 hours of light. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the g-C3N4 composite material, comprising (i) preparing graphene materials, (ii) preparing g-C3N4 materials, (iii) dissolving titanium salt in hydrochloric acid, controlling the temperature to react, separating the solid from the liquid, and collecting the solid phase to obtain the titanium dioxide material, and (iv) taking graphene material, g-C3N4 material and titanium dioxide material, dissolving in an organic solvent, ultrasonically dispersing, and evaporating the solvent to obtain final product.