Silver chloride-carbon nitride composite photocatalyst as well as preparation method and application thereof

The invention belongs to the technical field of photocatalysis, and particularly relates to a silver chloride-carbon nitride composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: taking graphite-phase carbon nitride, silver salt and chloride as precursors, and carrying out composite reaction through a molten salt method; the silver salt is selected from one or more of silver nitrate, silver sulfate, silver acetate and silver oxide, and the chloride is a mixture of potassium chloride and lithium chloride. The composite photocatalyst has the characteristics that the crystallinity of carbon nitride is good, and silver chloride and carbon nitride are tightly compounded. When being applied to a reaction for degrading antibiotic pollution in water, the photocatalyst is high in response to visible light, high in degradation efficiency and good in recycling performance, and has a wide application prospect in the field of environmental ca