Rare earth Er-doped NiO photocatalytic material as well as preparation method and application thereof

The invention provides a rare earth Er-doped NiO photocatalytic material and a preparation method and application thereof. The method comprises: weighing Ni(NO3) .5H2O, adding the weighed Ni(NO3) .5H2O into deionized water to prepare a first solution, adding NaOH into the first solution to precipitate the first solution to obtain a first mixture, stirring to obtain a first liquid mixture, washing with deionized water and absolute ethyl alcohol, drying to obtain a precursor Ni(OH)2; and respectively weighing KCl, LiCl, Er(NO3) .5H2O and the precursor Ni(OH)2, fully grinding to obtain a second mixture, placing the second mixture in an alumina crucible, grinding, mixing and stirring uniformly, calcining, naturally cooling to room temperature, alternately washing with deionized water and ethanol for multiple times, and finally drying to obtain the rare earth Er-doped NiO photocatalytic material. According to the rare earth Er-doped NiO photocatalytic material provided by the invention, the efficiency of photocata