Preparation and application of silicon dioxide layered coated titanium dioxide photocatalytic material

The invention provides preparation and application of a silicon dioxide layered coated titanium dioxide photocatalytic material, and the photocatalytic material is prepared by the following steps: mixing silicon dioxide with titanium dioxide, and forming a solid solution with silicon dioxide on the surface of titanium dioxide at high temperature; during rapid cooling, the silicon dioxide is slowly separated out in a layered form on the surface of the titanium dioxide to form a coating layer, and the required photocatalytic material is obtained. According to the photocatalytic material, distribution of silicon dioxide on the surface of titanium dioxide can be effectively controlled by regulating and controlling the content of silicon dioxide and the cooling rate, and a coating layer with holes is formed, so that the coating layer can effectively separate contact between titanium dioxide and an immobilized object and prevent the immobilized object from being decomposed by titanium dioxide; the titanium dioxide