KNbO/Ag-coated WO composite photocatalyst as well as preparation method and application thereof

The invention relates to the technical field of photocatalytic materials, in particular to a KNbO3/Ag-coated WO3 composite photocatalyst and a preparation method and application thereof.The KNbO3/Ag-coated WO3 composite photocatalyst is obtained by taking a WO3 nanorod and a KNbO3 microblock as raw materials, mixing the WO3 nanorod, the KNbO3 microblock and a silver nitrate solution, conducting photochemical reaction under irradiation of a xenon lamp and then conducting annealing in an inert atmosphere. According to the invention, Ag-coated WO3 and KNbO3 are compounded, so that on one hand, a narrow-band-gap semiconductor with matched energy bands is loaded on the surface of KNbO3, the spectral response range of KNbO3 is expanded, and the photon-generated carrier recombination rate of KNbO3 is reduced, and on the other hand, the surface active sites of WO3 are improved by Ag, so that the composite material overcomes the technical defects of KNbO3 and WO3 at the same time; and the KNbO3/Ag-coated WO3 composite