Preparation method and application of cuprous phosphide/cadmium sulfide composite photocatalyst

According to the preparation method and application of the Cu3P/CdS composite photocatalyst provided by the invention, firstly, cadmium sulfide nanoparticles are prepared from a cadmium source and a sulfur source by using a supergravity technology in combination with a crystallization reaction, so that the particle size of the particles is cut by a silk screen filler to be more uniform, the particle dispersion degree is better, and thus more reaction active sites are obtained; then, sodium hypophosphite monohydrate and copper chloride dihydrate are ingeniously selected as raw materials, cuprous phosphide can be generated on a cadmium sulfide reaction active site in situ to serve as an active component, cuprous phosphide serves as a novel p-type semiconductor and is compounded with a cadmium sulfide n-type semiconductor to form a p-n type heterojunction, and the p-n type heterojunction is formed; the Cu3P/CdS composite photocatalyst can absorb more sunlight and accelerate charge separation and transfer, the se