▎ 摘　　要

NOVELTY - Preparation of phosphorus-doped graphene quantum dot-graphitic carbon nitride PN junction photocatalyst, involves (i) dissolving 1,3,6-trinitropyrene and sodium dihydrogen phosphate dodecahydrate in water to obtain a mixed aqueous solution, carrying out one-step hydrothermal reaction under alkaline conditions, removing unreacted small molecules to obtain phosphorus-doped graphene quantum dots, (ii) dispersing graphitic carbon nitride powder in phosphorus-doped graphene quantum dot aqueous solution, and pouring out supernatant, taking sediment, washing and drying. USE - Preparation of phosphorus-doped graphene quantum dot-graphitic carbon nitride carbon PN junction photocatalyst for use in visible light degradation of dyes or organic contaminants, and photolysis hydrogen production. ADVANTAGE - The phosphorus-doped graphene quantum dot-graphitic carbon nitride PN junction photocatalyst significantly improves the photo-induced charge separation rate and visible light catalytic activity. DETAILED DESCRIPTION - Preparation of phosphorus-doped graphene quantum dot-graphitic carbon nitride PN junction photocatalyst, involves (i) dissolving 1,3,6-trinitropyrene and sodium dihydrogen phosphate dodecahydrate in water to obtain a mixed aqueous solution, carrying out one-step hydrothermal reaction under alkaline conditions, removing unreacted small molecules to obtain phosphorus-doped graphene quantum dots which are p-type semiconductor materials, (ii) dispersing graphitic carbon nitride powder in phosphorus-doped graphene quantum dot aqueous solution, pouring out the supernatant, taking out the sediment, washing, drying and obtaining phosphorus-doped graphene quantum dot- graphitic carbon nitride PN junction photocatalyst. An INDEPENDENT CLAIM is included for phosphorus-doped graphene quantum dot-graphitic carbon nitride PN junction photocatalyst which comprises 0.33-5 %mass phosphorus-doped graphene quantum dots and 95-99.67 %mass graphitic carbon nitride.