Bismuth-rich bismuth oxybromide/metal organic framework composite photocatalyst as well as preparation method and application thereof

The invention discloses a bismuth-rich bismuth oxybromide/metal organic framework composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst is prepared by carrying out hydrothermal reaction on a metal organic framework and bismuth-rich bismuth oxybromide, according to the microstructure, sheet-shaped bismuth-rich bismuth oxybromide tightly wraps the periphery of a cake-shaped metal organic framework, and nano microspheres are formed. The prepared composite photocatalyst has a large specific surface area, more adsorption sites and active sites are provided for photocatalytic reaction, meanwhile, a proper energy band structure is formed after the metal organic framework and the bismuth-rich bismuth oxybromide are compounded, separation of photo-induced electrons and holes is promoted, and the photocatalytic performance of the photocatalyst is improved. The composite photocatalyst has an excellent degradation effect on tetracycline under visible light, and the d