New preparation method of Bi12SiO20

Abstract

The invention discloses a preparation method of Bi12SiO20, which comprises the following steps: firstly dropwisely adding etraethyl orthosilicate into a glacial acetic acid solution of bismuth nitrate, adjusting the viscosity of the dropwisely added product by anhydrous alcohol, preheating in a muffle furnace at 350 DEG C for 10 min, heating to 700-800 DEG C and calcining for 180 min, cooling to room temperature to obtain the finished product. The molar ratio of bismuth nitrate, etraethyl orthosilicate, and glacial acetic acid is 12:1.2:620; the molar ratio of bismuth nitrate and anhydrous alcohol is 12:145. By introducing a new cosolvent and providing new raw material ratios and new preparation process conditions required by the preparation, the invention prepares Bi12SiO20 with a wider spectral response range, effectively reduces the environment pollution during the preparation, and reduces the manufacturing cost.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to semiconductor photocatalyst Bi 12 SiO 20 method of preparation. Background technique [0002] As we all know, due to the wide band gap of titanium dioxide as a photocatalyst (the anatase phase is 3.2eV), it has catalytic activity only under the irradiation of ultraviolet light with a wavelength below 387nm, and the utilization rate of the solar spectrum is low (less than 5%) . Therefore, people began to pay attention to the research and development of new photocatalytic materials. Chihuan He et al. (Chihuan He, Mingyuan Gu "Preparation, characterization and photocatalytic properties of Bi 12 SiO 20 powders" "Scripta Mater" 2006,55:481-484) using bismuth nitrate and ethyl orthosilicate as raw materials, glacial acetic acid as solvent, and ethylene glycol methyl ether as cosolvent to adjust the viscosity of the solution, using chemical solution decomposition technology (CSD ), prepa...

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Problems solved by technology

[0003] However, Chihuan He et al. prepared Bi 12 SiO 20 There is a major defect in the method, that is, the toxicity of the used cosolvent ethylene glycol methyl ether is too high, and if inhaled into the body, it will make people's head hurt, the harm caused to the environment is relatively large, and the price is too high

Another disadvantage is that the band gap of the finished product is still wide, and the visible light response ability is still not very satisfactory.

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