Preparation method of Cu:ZnO/N:rGO composite photocatalyst

The invention discloses a preparation method of a p-n junction type Cu:ZnO/N:rGO composite photocatalyst formed by Cu doped ZnO nanorods and N doped rGO. The Cu:ZnO/N:rGO composite photocatalyst is formed by coating the Cu doped p-type ZnO nanorods with the N doped n-type rGO. The preparation method comprises the following steps: the Cu doped ZnO nanorods are prepared with a hydrothermal method firstly; then the Cu doped ZnO nanorods and GO are assembled with a hydrothermal reduction method to form a Cu:ZnO/rGO composite photocatalyst; finally, Cu:ZnO/rGO is subjected to annealing treatment in NH3 atmosphere for N doping, and the Cu:ZnO/N:rGO composite photocatalyst is obtained. The Cu:ZnO/N:rGO composite photocatalyst prepared with the method has very high photocatalytic activity in ultraviolet light and can inhibit photo-corrosion of ZnO, the stability of the photocatalyst is improved greatly, and the photocatalyst has great potential application values in the field of sewage treatment.