Preparation method of bismuth vanadate visible light photocatalysis material

The invention discloses a method for synthesizing a Eu-doped BiVO4 visible light photocatalysis material by using a citric acid complexed sol-gel method. The preparation method is simple, and the visible light activity of the obtained photocatalyst is high. According to the invention, Bi(NO3)3.5H2O (97%) and NH4VO3 (98.5%) are adopted as source materials; citric acid (99.5%) is adopted as a chelating agent; Eu(NO3)3 is adopted as a doping source material; the pH value is regulated by using ammonia water, and a deep blue sol is prepared; the sol is dried by baking, and is calcined for 5h under the temperature of 500 DEG C, such that the Eu-doped bismuth vanadate photocatalysis material is obtained. Compared with non-doped bismuth vanadate, oxygen vacancies and V with catalytic activities in the Eu-doped bismuth vanadate crystals are increased. After doping, red shift occurs in the light absorption performance of the sample, the band gap can be narrowed, such that the visible light photocatalyti