▎ 摘　　要

NOVELTY - Preparation of bismuth oxide/ferroferric oxide/graphene heterojunction composite material includes preparing bismuth oxide solution; adding equal amounts of ferric sulfate solution and ferrous sulfate solution to bismuth oxide solution, stirring to form first mixed solution; adding graphene oxide and sonicating until solution is uniformly dispersed to obtain second mixed solution; and pouring into reaction kettle, cooling, washing, and drying. USE - The method is for preparation of bismuth oxide/ferroferric oxide/graphene heterojunction composite material for degradation of tetracycline at pH of 4.0-7.2 (claimed). ADVANTAGE - The method prepares composite material that has increased specific surface area. The structure of graphene facilitates migration of electron pairs, thus improving photocatalytic efficiency of composite material. The composite material has good degradation performance and relatively high stability. When it is used in photocatalysis as catalyst, it has higher recovery and utilization rate.