Method for producing nano-anatase mine titanium oxide water sol

Abstract

A process for preparing the hydrosol of nano-class anatase-type TiO2 features that reaction between Ti-contained organic substance, distilled water or deionized water, chelating agent and hydrodecomposing inhibitor at 30-120 deg.C for 3-12 hr while stirring and controlling pH=1-5.

Description

technical field [0001] The invention belongs to a preparation method of a nanometer titanium dioxide photocatalytic material, in particular to a preparation method of an anatase type titanium dioxide aqueous sol responding to visible light. Background technique [0002] Due to its excellent physical and chemical properties, nano-titanium dioxide has broad application prospects in solar energy conversion and utilization, environmental purification, etc., so it has become a research and development hotspot in domestic and foreign academic circles and enterprises in recent years. At present, the methods for preparing nano titanium dioxide mainly include hydrolysis method, chemical precipitation method, sol-gel method, microemulsion method and gas phase reaction method, among which the sol-gel method is favored because of its simple operation, high purity and small particle size of the synthesized titanium dioxide. Favored, that is to use titanium salt as raw material to obtain ...

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Problems solved by technology

[0005] The preparation of anatase-type titanium dioxide sol with inorganic titanium source as the main raw material includes the process of hydrolysis and precipitation of inorganic titanium salt, filtration and washing of the precipitate, and acid degumming. The preparation process is complicated, time-consuming, and unfavorable for mass production. At the same time, the hydrolysis process of titanium tetrachloride in the commonly used inorganic titanium salt is very violent even at 0°C, and a large amount of highly corrosive gas hydrogen chloride is produced, which pollutes the environment, pollutes the environment, and is harmful to the human body. Health damage; In addition, if the sediment is not filtered and washed sufficiently, it will easily lead to high impurity content and affect the photocatalytic activity of the sol

[0006] In the aspect that the main raw material is an organic titanium source, in the Chinese patent application number 200410012965.9, the titanium alkoxide is hydrolyzed to obtain an amorphous titanium dioxide sol, and then the above titanium dioxide sol or titanium dioxide composite sol containing other oxides are placed in a closed pressure-resistant container In the process, treat at 80°C-250°C for 0.5-24.0 hours, take it out after cooling, and ultrasonically treat it for 1-120 minutes. This method still requires heat treatment in a closed pressure-resistant container at a higher temperature, which brings inconvenient

In the Chinese patent with application number 200510039171.6, the organic titanium source or inorganic titanium source is added to the organic alcohol solvent, configured as an alcohol solution of titanium compound, and then added dropwise to an acidic aqueous solution for hydrolysis, and heated at 65°C to 85°C After refluxing at high temperature for 6 to 48 hours, evaporate and remove alcohols at 50°C to 55°C to obtain anatase titanium dioxide sol. This process needs to be refluxed at a higher temperature, which is not conducive to mass production. Evaporation removes alcohols, which has certain pollution to the environment

[0007] In summary, although there are many methods for the preparation of nano-anatase titanium dioxide aqueous sol reported at present, there are deficiencies in varying degrees from the perspective of industrial production and environmental protection factors.

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