SnS2/SnO2 planar heterojunction photocatalyst as well as preparation method and application thereof

The invention discloses a SnS2/SnO2 planar heterojunction photocatalyst as well as a preparation method and application thereof, the SnS2/SnO2 planar heterojunction photocatalyst is of a two-dimensional layered structure, and oxygen is uniformly distributed on the layered surface of the SnS2/SnO2 planar heterojunction photocatalyst and in the layer-to-layer connection part of the SnS2/SnO2 planar heterojunction photocatalyst. The SnS2/SnO2 planar heterojunction disclosed by the invention is used as a photocatalyst to be applied to a removal reaction of methyl orange and hexavalent chromium under visible light, and shows excellent redox photocatalytic activity. Besides, in a cycle test, the SnS2/SnO2 material also shows relatively high stability, and provides possibility for photocatalytic continuous removal of pollutants in a water environment. The SnS2/SnO2 planar heterojunction photocatalyst provided by the invention can be recycled for multiple times, is low in cost and simple in process, and has a large-s