Aluminum doped titanium dioxide nano tube visible-light responsive photocatalyst and preparation method

Abstract

The invention discloses an aluminum-doped titanium dioxide nanotube visible light catalyst and a preparation method thereof. The aluminum-doped titanium dioxide nanotube visible light catalyst is prepared by the following method: (1) titanium dioxide powder and aluminum oxide powder are added into a sodium hydroxide water solution to be stirred, heated and react; (2) the mixture is cooled to normal temperature and is washed until the pH value is between 6.5 and 7.5; (3) an inorganic acid aqueous solution is used to adjust the pH value, the soaking is performed, and then the washing is performed until the pH value is between 6.5 and 7.5; (4) a trapped concentrated solution is dried to obtain a solid after the filtration; and (5) the calcination is performed for 5 to 7 hours at a temperature of between 300 and 700 DEG C to obtain the aluminum-doped titanium dioxide nanotube visible light catalyst. The catalyst can reduce the treatment cost for photocatalytic reactions, and fully utilize solar resources; the removal rate of the catalyst to humic acid TOC under visible light irradiation is high up to more than 70 percent and is only reduced by 10 percent or so compared with that of under ultraviolet lamp condition, thereby showing a good visible light excitation function.

Description

technical field

[0001] The invention relates to a photocatalyst and a preparation method, in particular to a visible light catalyst and a preparation method. Background technique

[0002] Because photocatalysis can generate hydroxyl radicals with strong oxidation ability, which can degrade pollutants non-selectively, so the development of new and efficient photocatalysts has become a hot spot. As a photocatalyst, titanium dioxide nanotubes, as products with a larger specific surface area in the titanium dioxide series, have become a research hotspot for photocatalysts and ozone catalysts.

[0003] However, due to the limitations of catalysts, most of the light sources used to study photocatalytic reactions are ultraviolet light sources. In actual use, the processing cost is relatively high, which is harmful to the human body, and the practical value is limited. At present, the solution to this problem is generally to dope the catalyst with elements, so that the catalyst can...

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