Preparation method of high-activity SnO2-TiO2 composite nanometer photocatalyst

Abstract

The invention discloses a preparation method of a high-activity SnO2-TiO2 composite nanometer photocatalyst, which comprises the following operating steps: (1) mixing tetrabutyl titanate, tetrabutyl titanate and glacial acetic acid, adding dilute nitric acid and water, stirring, and standing; (2) adding the SnCl4.5H2O solution to the mixed solution, stirring and ageing, wherein the molar ratio of titanium to tin in the mixed solution is (10-80):1; (3) putting the aged substance into an autoclave for constant temperature treatment for 22-27 h, and cooling to the room temperature; (4) using absolute ethyl alcohol to repeatedly wash the obtained cooled product, performing centrifugal separation, drying and grinding the separated product to obtain the high-activity SnO2-TiO2 composite nanometer photocatalyst. According to the invention, the high-activity SnO2-TiO2 composite nanometer photocatalyst is prepared through the sol-solvothermal method; the prepared photocatalyst has high activity, higher purity and excellent dispersity; the operating steps are remarkably reduced to be completed in 2-3 days and even shorter, so that more convenience and safety are realized, the reaction period is shorter and the operating parameter is easy to control.

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 sci...

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Problems solved by technology

For this kind of two-by-two composite method, there is no fixed operating condition, and the scope of use is relatively limited; at the same time, the activity of the catalyst prepared by the composite method is unstable, the dispersion performance is not good, and the preparation takes a long time. The period is 4~5d, so that the scope of use is still not wide

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