Method for preparing Z-shaped photocatalytic material bismuth vanadate-silver-silver bromide

The invention relates to a method for preparing Z-shaped photocatalytic material bismuth vanadate-silver-silver bromide. The method comprises the following steps: firstly, dispersing bismuth vanadate microcrystals in a water solution, adding a certain quantity of silver bromide, performing stirring till silver bromide is dissolved, and performing irradiation for 3 h by use of a 300 W xenon lamp to enable in-situ reduction of silver ions on the surface of bismuth vanadate to become silver nanoparticles (a faint yellow suspension becomes grey green); then, centrifugally washing obtained sediment for three times to remove impurity ions, and performing drying to obtain bismuth vanadate-silver; and finally, dispersing bismuth vanadate-silver in the water solution, adding ferric nitrate and a potassium bromide solution, enabling reaction for 1 h, and centrifugally washing to obtain a AgBr-Ag-BiVO4 photocatalytic material. The method has the advantages that the operation is simple, reaction conditions are mild, and