Preparation method of SnO2-TiO2 composite nano photocatalyst

Abstract

A preparation method of a SnO2-TiO2 composite nano photocatalyst comprises operation steps as follows: (1), mixing tetrabutyl titanate, absolute ethyl alcohol and glacial acetic acid, adding dilute nitric acid to regulate pH, stirring and adding water; (2) adding a SnCl4*5H2O solution into the mixed solution in a molar ratio of titanium to tin to be 3:1, stirring, and aging for 22-26 h; (3) placing the aged material into an autoclave for treatment for 22-25 h at the temperature of 175-185 DEG C, and cooling the material in the autoclave to the room temperature; and (4) performing centrifugal separation on a product, then drying the product at 95-110 DEG C and roasting the product for 2-6 h to obtain a finished product. The SnO2-TiO2 composite nano photocatalyst prepared with the method has higher purity and activity, good dispersibility, high thermostability and good repeatability; the method does not require addition of a surfactant and the like, so that the cost is lower, and the production cost is reduced greatly; and meanwhile, the production time is shortened to 2-3 d, and further, the operation is simple and safe.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, and relates to a SnO 2 -TiO 2 Preparation method of composite nano photocatalyst. Background technique [0002] TiO 2 Commonly known as titanium dioxide, it is an n-type semiconductor material with a band gap of 3.2eV. Because of its high specific surface area, low cost, non-toxicity, strong photoelectric performance, and high catalytic activity, it has become the most promising photocatalyst at present. However, TiO 2 The inherent physical characteristics of the photocatalyst determine that its utilization rate of solar energy is very low, and the electron-hole recombination rate is high, resulting in a greatly reduced photocatalytic activity. Therefore, by TiO 2 Modification to expand the excitation wavelength from ultraviolet to visible light, slow down the electron-hole recombination, and increase the photocatalytic efficiency has become the research focus of sc...

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Problems solved by technology

[0011] These methods have been reported in the literature to prepare SnO 2 -TiO 2 Composite nano photocatalysts, but the activity of the catalysts prepared by these methods is not high, which makes the reaction effect not good; when the catalyst is prepared by the precipitation method or the hydrothermal method alone, the precursor used is titanium tetrachloride, titanium tetrachloride When thermally decomposed, the reaction is violent, and a large amount of dense smoke occurs, which makes the reaction process more dangerous; the prior art prepares SnO 2 -TiO 2 Surfactants and other substances need to be added to the composite catalyst, resulting in high production costs. At the same time, it usually takes 4-5 days to prepare the catalyst, which is too long

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