▎ 摘　　要

NOVELTY - Graphene oxide quantum dot/oxygen-doped porous carbon nitride composite photocatalyst, is prepared by (i) taking melamine, calcining in an air atmosphere to prepare bulk carbon nitride, ultrasonically dispersing carbon nitride in water, carrying out hydrothermal reaction, cooling, carrying out solid-liquid separation, collecting precipitate, drying, grinding into powder and preparing an oxygen-doped porous carbon nitride, (ii) dispersing graphite oxide in water to obtain a dispersion liquid, adding concentrated nitric acid and concentrated sulfuric acid, heating, refluxing and reacting, cooling, adding a pH regulator to adjust the pH of the dispersion liquid, filtering and dialyzing to obtain a graphene oxide quantum dot dispersion liquid, and (iii) dispersing the porous carbon nitride in water, adding the graphene oxide quantum dot dispersion liquid, stirring, reacting, carrying out solid-liquid separation, collecting precipitate, washing, drying and grinding to obtain the product. USE - As graphene oxide quantum dot/oxygen-doped porous carbon nitride composite photocatalyst. ADVANTAGE - The composite photocatalyst is cost-effective and is prepared by adopting simple operation, and has high photocatalytic efficiency and excellent recyclability. DETAILED DESCRIPTION - Graphene oxide quantum dot/oxygen-doped porous carbon nitride composite photocatalyst, is prepared by (i) taking melamine as a raw material, calcining in an air atmosphere to prepare bulk carbon nitride, ultrasonically dispersing carbon nitride in water, carrying out hydrothermal reaction, cooling after the reaction, carrying out solid-liquid separation, collecting precipitate, drying and grinding the precipitate into powder and preparing an oxygen-doped porous carbon nitride, (ii) ultrasonically dispersing graphite oxide in water to obtain a graphite oxide dispersion liquid, adding concentrated nitric acid and concentrated sulfuric acid, heating, refluxing and reacting, cooling to room temperature, adding a pH regulator to adjust the pH value of the dispersion liquid to 7-9, and filtering and dialyzing to obtain a graphene oxide quantum dot dispersion liquid, and (iii) ultrasonically dispersing the porous carbon nitride in water, adding the graphene oxide quantum dot dispersion liquid, stirring and mixing, reacting, carrying out solid-liquid separation after the reaction, collecting precipitate, washing the precipitate, drying and grinding to obtain the product.