▎ 摘　　要

NOVELTY - Heteroatom-doped modified graphitic carbon nitride heterojunction photocatalytic degradation material comprises phosphorus and oxygen co-doped graphitic carbon nitride, graphene oxide, tin(IV) chloride, chromium(III) nitrate, thiourea, dispersant and surfactant, where the mass ratio between graphene oxide, tin(IV) chloride, chromium(III) nitrate, thiourea and dispersant is 5-15:100:1-8:55-65:55-65:80-120:400-800. USE - Used as heteroatom-doped modified graphitic carbon nitride heterojunction photocatalytic degradation material. ADVANTAGE - The photocatalytic degradation material: has reduced band gap width of graphitic carbon nitride and increased specific surface area of graphitic carbon nitride; and improves light responsiveness of visible light. The method: produces nano petal-shaped chromium-doped tin(IV) sulfide-modified graphene oxide having ultra-high specific surface area, which narrows band gap of tin(IV) sulfide; and forms Z-type composite heterojunction between phosphorus and oxygen co-doped graphitic carbon nitride and chromium-doped tin(IV) sulfide, which promotes separation of photo-generated electrons and holes through Z-type heterojunction electron transport mechanism, reduces recombination rate, can react with water and oxygen to generate hydroxy free radical and superoxide free radical and thus realizes photocatalytic degradation process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing heteroatom-doped modified graphitic carbon nitride heterojunction photocatalytic degradation material, comprising (i) adding graphene oxide into distilled water solvent, uniformly ultrasonically dispersing, adding surfactant Triton X-100 (RTM: Nonionic surfactant comprising a hydrophilic polyethylene oxide group and a hydrocarbon lipophilic or hydrophobic group), dispersant sodium citrate, tin(IV) chloride, chromium(III) nitrate and thiourea, pouring solution into a hydrothermal reaction kettle, heating to 160-200 degrees C, reacting for 15-25 hours, filtering, washing and drying to obtain nano petal-shaped chromium-doped tin(IV) sulfide-modified graphene oxide, and (ii) adding step (i) product and phosphorus and oxygen co-doped graphitic carbon nitride into distilled water solvent, uniformly ultrasonically dispersing, pouring into the hydrothermal reaction kettle, heating to 120-150 degrees C, reacting for 6-10 hours, filtering, washing and drying to obtain final product.