Graphene-doped Ag/TiO2 photocatalytic coating layer and preparation method thereof

The invention discloses a graphene-doped Ag/TiO2 photocatalytic coating layer and a preparation method thereof. The preparation method comprises the following steps: 1) pretreating a workpiece; 2) preparing a graphene doped Ag/TiO2 composite slurry; 3) pressing the slurry on the surface of the pretreated workpiece using a mechanical roller to form a base layer; 4) placing the workpiece with the formed base layer in a sintering mold, adopting vacuum induction sintering method, and forming a preset layer on the surface of the workpiece after sintering; and 5) placing the workpiece with the preset layer in laser processing equipment for laser cladding to obtain the graphene doped Ag/TiO2 photocatalytic coating layer. The graphene-doped Ag/TiO2 photocatalytic coating layer is capable of shortening catalyst forbidden band width to realize expansion of absorption spectrum towards visible light, so that utilization rate of solar energy is increased. The properties of the dopant are fully utilized, the synergistic ef