Rare-earth composite g-C3N4 graphene photocatalyst and preparation method thereof

The invention relates to a photocatalytic material for treating organic pollutants in water and a preparation method thereof. The photocatalytic material is formed by compounding layered semiconductor g-C3N4 graphene material with visible-light response and beta-NaYF4: Yb, Tm rare-earth nanoparticles with upconversion performance, wherein the beta-NaYF4: Yb, Tm rare-earth nanoparticles are uniformly distributed on the surface of the g-C3N4 graphene material, and a composite photocatalytic material with heterostructure and near-infrared light response is formed. According to successful compounding of the rare-earth nanoparticles, the g-C3N4 graphene can absorb visible light emitted by the rare earth through upconversion, so that the infrared light response is realized. The catalyst has excellent catalytic activity under near-infrared light, the concentration of the organic pollutants in the water can be rapidly reduced in a short time, and finally the pollutants can be almost completely degraded. The preparation method is simple and feasible, and the catalyst can be conveniently recycled and has wide application prospects.