▎ 摘　　要

NOVELTY - A preparation method of a photocatalytic composite material comprises (S1) mixing butyl titanate and hydrofluoric acid, ultrasonically treating, reacting at 150-250℃ for 10-20 hours, cleaning the reaction product, and calcining at 400-600℃ for 2-5 hours under argon atmosphere to obtain titanium dioxide nanosheet exposing (001) crystal surface and (S2) dispersing graphene oxide in water and ultrasonically processing, (S3) adding hydrazine hydrate to the solution of step (S2), adding titanium dioxide nanosheets and silver nanowires, (S4) uniformly dispersing and reacting at 130-250℃ for 1-6 hours and (S5) carrying out carbonization treatment on the reaction product obtained in step (S4) and calcining at 400-600℃ for 2-5 hours under argon atmosphere to obtain the photocatalytic composite material. USE - The method is used for preparing photocatalytic composite material for treating water pollution, preparing hydrogen, redoxing carbon dioxide, promoting photochemical reaction and inhibiting bacterial growth. The photocatalytic composite material is used for preparing photocatalytic preparation or bacteriostatic preparation (all claimed). The photocatalytic composite material is used for sewage treatment. ADVANTAGE - The composite material has good catalytic activity, catalytic stability and antibacterial performance.