Bismuth metal loaded tungsten nitride photocatalyst as well as preparation method and application thereof

The invention relates to a bismuth metal loaded tungsten nitride photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) addinga pyridine aqueous solution into a phosphotungstic acid aqueous solution, heating, stirring, centrifuging, drying, and calcining in ammonia gas to obtain tungsten nitride nanosheets; (2) adding bismuth nitrate into a NaOH solution, carrying out hydrothermal treatment, carrying out centrifugal drying, collecting powder, and calcining in air to obtain a flower-like BiO precursor; and (3) dissolvingthe tungsten nitride nanosheet and the flower-like BiO precursor in water, carrying out hydrothermal reaction, centrifuging, collecting powder, and calcining in ammonia gas to obtain the bismuth metal loaded tungsten nitride photocatalyst. Compared with the prior art, the photocatalyst provided by the invention has the characteristics of wide light absorption range, high water decomposition hydrogen production performance