Small-size bismuth vanadate modified flower-like cadmium sulfide heterostructure photocatalyst and preparation method thereof

The invention provides a small-size bismuth vanadate modified flower-like cadmium sulfide heterostructure photocatalyst and a preparation method thereof.The preparation method comprises the following steps that S1, cadmium acetate and thiourea are dissolved in a solvent to be subjected to a hydrothermal reaction, precipitates are separated, and cadmium sulfide nanoflowers are obtained; s2, adding the cadmium sulfide nanoflower into a solvent, adding sodium oleate, bismuth nitrate and ammonium vanadate, mixing, then carrying out hydrothermal reaction on the mixed solution, and separating precipitate to obtain the cadmium sulfide heterostructure photocatalyst. The cadmium sulfide in the photocatalyst is of a three-dimensional flower-shaped structure formed by self-assembly of a sheet structure, the ultrathin structure of the cadmium sulfide can shorten the path of migration of photon-generated carriers from the interior of the cadmium sulfide to the surface of the cadmium sulfide to participate in a reaction, a