▎ 摘　　要

NOVELTY - An application method of metalporphyrin-functionalized graphene quantum dot/boron nitride composite photocatalytic material in photolysis of water comprises adding photocatalytic material into reaction vessel, and performing water photolysis using xenon lamp as light source to obtain hydrogen. The photocatalytic material uses metalloporphyrin as photosensitizer, graphene quantum dots as electron transfer agents, and two-dimensional boron nitride nanosheets as carriers. The metal porphyrin is covalently grafted to graphene quantum dots, and loaded on two-dimensional boron nitride nanosheets. USE - The method is for application of metalporphyrin-functionalized graphene quantum dot/boron nitride composite photocatalytic material in photolysis of water. ADVANTAGE - The method utilizes the large specific surface and high electron transfer performance of graphene quantum dots and hole absorption performance of negatively charged boron nitride nanosheets, improves the separation efficiency of electron-holes excited by photosensitizer metalloporphyrin under light conditions, and improves photocatalytic efficiency of photocatalytic material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the photocatalytic material comprising dispersing graphene oxide (GO) in dimethylformamide (DMF), ultrasonically dispersing, adding thionyl chloride, refluxing at 50-70 degrees C for 20-30 hours under nitrogen atmosphere, and evaporating to remove unreacted thionyl chloride and excess solvent and obtain acylated graphene oxide; ultrasonically dispersing in DMF, dropping small amount of triethylamine as catalyst, adding amino metalloporphyrin, reactingt o 100-140 degrees C for 36-72 hours under nitrogen atmosphere, pouring into ether to carry out precipitation, filtering through 0.22 mu m filter membrane, and washing filtered product to obtain metalloporphyrin covalently grafted graphene oxide; and dispersing in deionized water, adding boron nitride nanosheets aqueous dispersion, ultrasonically dispersing, dropping hydrogen peroxide, ultrasonically dispersing, transferring to PTFE-lined reactor, sealing, reacting to 130-200 degrees C for 2-6 hours, and centrifuging.