Method for preparing titanium dioxide photocatalysis multi-layer film with interface defect

The invention provides a method for preparing a titanium dioxide photocatalysis multi-layer film with an interface defect, which belongs to the technical field of titanium dioxide catalysts. A defect is introduced into an interface of the TiO2 multi-layer film through a low-temperature plasma treatment technology, which can effectively reduce and avoid the loss of the defect, accelerate the seperation of photoelectron-hole pair in the photocatalyst, and greatly improve the photocatalysis efficiency. The TiO2 photocatalysis multi-layer film prepared in the invention has the very good photoinduced hydrophilicity and very good photocatalysis activity and can carry out a photocatalysis reaction effectively. Furthermore, the multi-layer film has wide application range, low cost, convenient use and easy separation and recovery.