Preparation method of vanadium-nitrogen co-doped tio2 photocatalyst

Abstract

The invention provides a preparation method of a vanadium-nitrogen co-doped TiO2 photocatalyst. According to the invention, vanadium source is sufficiently dissolved into a mixed phase of tetrabutyl titanate, diethanolamine and ethanol; a vanadium source auxiliary solvent is added to the materials, and the materials are stirred under room temperature, such that the mixed liquid turns into a yellow transparent solution; under severe stirring, the mixed liquid is gradually dropped into a mixed liquid of acetic acid and deionized water in an ice-water bath; the obtained mixture is allowed to react for 1 to 3 hours while stirring, such that the reaction liquid turns into a translucent sol; the translucent sol is positioned in a water bath kettle with a temperature of 308K to 348K, and the solis aged for 12 to 48 hours; the aged sol is positioned in a drying baker, and is dried by baking under a temperature of 353K to 393K; the solid obtained by baking is grinded, and is calcined for 1 to6 hours under a temperature of 573K to 873K; the powder obtained by calcining is grinded again, such that vanadium-nitrogen co-doped TiO2 is obtained. As results of experiments, vanadium-nitrogen co-doped TiO2 synthesized in the invention has good photocatalytic activity and excellent degradability upon phenol; the method is simple and easy to control; and less TiO2 is doped, such that the cost is low, and the method is suitable for industrialized productions.

Description

technical field [0001] The invention relates to a vanadium-nitrogen co-doped TiO 2 The invention discloses a method for preparing a photocatalyst, belonging to the field of photocatalytic materials. Background technique [0002] The use of semiconductor photocatalysts to degrade organic pollutants has the characteristics of mild reaction, high efficiency, simple operation, easy control, and environmental friendliness, and has attracted increasing attention. Among the widely studied semiconductor photocatalytic materials, TiO 2 Due to the advantages of stable chemical properties, good acid and alkali resistance, non-toxicity, abundant sources, low cost, and good catalytic performance, it is considered to be a photocatalyst with the most application potential at present. But due to TiO 2 The bandgap width of 3.0-3.2eV can only absorb ultraviolet light, and ultraviolet light is only 7% in sunlight, so the development of photocatalysts with high catalytic activity under sunli...

AI Technical Summary

Problems solved by technology

[0004] Synthesis of vanadium nitrogen co-doped TiO by particle method 2 In the method, the conventional method is to add vanadium source and nitrogen source to the aqueous solution, and then drop the mixture of titanium precursor and alcohol solvent into the aqueous solution to undergo hydrolysis reaction. In this method, doping substances are easy to only adhere to the surface. , without access to the TiO 2 Therefore, the photocatalyst synthesized by this method has the disadvantages of unstable catalytic performance and poor photocatalytic activity.

Images