▎ 摘　　要

NOVELTY - Metalloporphyrin-functionalized graphene quantum dot/boron nitride composite photocatalytic material, is claimed. The photocatalytic material is prepared by taking metalloporphyrin as photosensitizer, graphene quantum dots as electron transfer agent, two-dimensional boron nitride nanosheet as carrier, covalently grafting metalloporphyrin onto graphene quantum dots, and loading on two-dimensional boron nitride nanosheet. USE - The photocatalytic material is useful in the field of photolysis of water to produce hydrogen. ADVANTAGE - The method: utilizes graphene quantum dots having large specific surface and high electron transfer performance; utilizes negatively charged boron nitride nanosheet having hole absorption performance; improves separation efficiency of electron-hole excited by photosensitizer metalloporphyrin under illumination condition and thus improves photocatalytic efficiency of photocatalytic material; and produces product having high hydrogen production efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing metalloporphyrin-functionalized graphene quantum dot/boron nitride composite photocatalytic material, comprising (i) dispersing graphene oxide in dimethylformamide, ultrasonically dispersing uniformly, adding thionyl chloride, refluxing and reacting at 50-70 degrees C for 20-30 hours under nitrogen atmosphere, and evaporating to remove unreacted thionyl chloride and excess solvent to obtain acyl chloride of graphene oxide, (ii) re-dispersing product obtained in step (i) in dimethylformamide, ultrasonically dispersing uniformly, dropwise adding a small amount of triethylamine as catalyst, adding amino-metalloporphyrin, reacting at 100-140 degrees C for 36-72 hours under nitrogen atmosphere, pouring obtained reactant into diethyl ether to precipitate, filtering using a 0.22 mu m filter membrane and fully washing filtered product to obtain metalloporphyrin covalently grafted graphene oxide, and (iii) dispersing product obtained in step (ii) in deionized water, adding aqueous boron nitride nanosheet dispersion, ultrasonically dispersing uniformly, dropwise adding hydrogen peroxide, ultrasonically dispersing uniformly, transferring mixed solution into a reaction kettle lined with polytetrafluoroethylene, sealing, performing hydrothermal reaction at 130-200 degrees C for 2-6 hours, centrifuging and separating to obtain final product.