Method for synthesizing bismuth vanadate photocatalyst through starch self-combustion

The invention provides a method for synthesizing a bismuth vanadate photocatalyst through starch self-combustion. According to the method, BiNO3-5H2O and NH4VO3 with the molar ratio being 1:1 are dissolved in diluted nitric acid and deionized water respectively, after the BiNO3-5H2O and the NH4VO3 are completely dissolved and evenly stirred, the two solutions are mixed and stirred, the pH value of the mixed solution is adjusted to be 0.65-0.75 through aqueous ammonia, starch is added into the mixed solution to serve as an accelerant, stirring continues for 40-80 min, and a pasty solution is obtained; the pasty solution is taken out and placed in a muffle furnace to be heated to 600-660 DEG C, heat is preserved for 6-7 hours, and fluffy powder BiVO4 can be obtained. The starch is used as the accelerant, the bismuth vanadate photocatalyst is synthesized through the self-combustion method, the appearance of the bismuth vanadate photocatalyst is in a net-shaped particle ball shape, the diameter of a particle ball ranges from 8 microns to 15 microns, the bismuth vanadate photocatalyst has large specific surface area and high adsorption capacity, photocatalytic activity is improved, and the photocatalyst has an obvious visual light absorbing effect. Besides, the synthesizing process is simple, cost is low, environment friendliness is achieved, and the method is suitable for industrial production.