▎ 摘　　要

NOVELTY - Method for preparing composite photocatalytic material, involves (i) adding titanium sulfate to a hydrofluoric acid aqueous solution, ultrasonically processing for 15 minutes, stirring for 10-20 minutes, reacting at 180 degrees C for 12 hours in a polytetrafluoroethylene reactor, washing and drying to obtain hollow titanium dioxide powder as a partially hollow microsphere structure, and (ii) mixing the titanium dioxide powder with nitrogen-doped graphene in deionized water, ultrasonically processing for 3 hours, transferring to a polytetrafluoroethylene reactor, reacting at 180 degrees C for 12 hours, naturally cooling, centrifuging and drying to obtain the target product. USE - The method is useful for preparing composite photocatalytic material for treating dye wastewater. ADVANTAGE - The method provides the composite photocatalytic material having excellent photocatalytic activity, adopts simple and convenient preparation process, reduces reaction cost, does not require other additives or catalysts in the reaction process, and the utilization of sunlight is high, and effectively reduces the treatment cost of dye wastewater.