Preparation method of bismuth vanadate/titania composite photocatalytic material

Abstract

The invention provides a preparation method of a bismuth vanadate / titania composite photocatalytic material. Titania is compounded with another semiconductor bismuth vanadate by hydrothermal method and sol-gel method, the light absorption range of the compounded semiconductor is extended to visible light, the sunlight absorption efficiency of the titania is improved, and quantum efficiency and catalysis of the titania are improved; the titania is doped into the bismuth vanadate to facilitate separation of electrons and holes in a catalyst, after the titania is doped into the bismuth vanadate,the spectral response range of the titania can be extended, the crystal lattice of the titania is distorted, and many adsorbed hydroxyl groups are increased on the surface of the new catalyst, have apromoting effect on the production of hydroxyl radicals, can change the electronic structure of the titania, reduce the bandgap energy of the titania, and increases the photocatalytic efficiency.

Description

technical field [0001] The invention relates to a preparation method of a bismuth vanadate / titanium dioxide composite photocatalytic material, which belongs to the technical field of semiconductor composite photocatalytic material preparation. Background technique [0002] Among many semiconductor photocatalysts, TiO 2 It is recognized as the most promising environment-friendly photocatalytic material. In the solar spectrum, ultraviolet light accounts for 5%, visible light accounts for 47%, and TiO 2 Photocatalysts have a wide band gap and can only absorb ultraviolet light energy, so the utilization rate of solar energy is low. BiVO 4 As a new type of visible light semiconductor photocatalyst, it is a narrow bandgap semiconductor with superior performance, which has a good absorption response to visible light and has certain acid and alkali resistance and chemical stability. However, pure BiVO 4 Catalysts have problems such as small specific surface area, poor adsorptio...

AI Technical Summary

Problems solved by technology

However, pure BiVO 4 Catalysts have problems such as small specific surface area, poor adsorption performance, and difficult migration of photogenerated carriers.