Process for preparing anatase type TiO2 sol

Abstract

The invention discloses a process for preparing anatase type TiO2 sol which comprises preparing alcoholic solution of titanium compounds from titanium compounds and alcohols by the mol ratio of 1:1.42-12, agitating and dropping the alcoholic solution of titanium compounds into the water solution of acid with pH=1.0-4.0 for hydrolytic decomposition, the mol ratio of titanium compounds and water in the aqueous solution of acids being 1:76-151, inversing flow for 6-48 hours at 65-85 deg. C, evaporating the obtained sol at 50-55 deg. C to remove the alcohols, thus obtaining octahedrite type titanium dioxide collosol.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide used for preparing photocatalytic materials, in particular to a preparation method of anatase titanium dioxide sol. Background technique [0002] The control and treatment of environmental pollution has been paid more and more attention. The deteriorating environmental problems urgently need a more environmentally friendly and inexpensive technology to degrade pollutants in the atmosphere and water. In the past few decades, due to the strong oxidation, chemical stability and non-toxicity of titanium dioxide, titanium dioxide photocatalysis has become one of the most promising environmental purification technologies. In the practical application of photocatalytic degradation of wastewater and waste gas, in order to continuously use titanium dioxide and avoid subsequent complicated filtration and recovery steps, titanium dioxide is often fixed on different substrate materials. A large num...

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Problems solved by technology

The titanium dioxide film prepared by the sol-gel method at room temperature is amorphous and non-crystalline, and hardly shows any photocatalytic activity. Usually, it needs to be crystallized by high temperature heat treatment above 400 ° C, which limits the application of titanium dioxide photocatalytic film. Application on non-high temperature resistant materials such as polymer materials

Chinese patent: CN1156336C discloses an invention patent titled "Preparation Method of Titanium Dioxide Thin Film Photocatalyst Supported on the Surface of a Flexible Substrate Material", which involves solvothermal crystallization of an amorphous titanium dioxide gel film supported on the surface of a flexible substrate material at 100-180°C , so as to obtain titanium dioxide nanocrystalline film on the substrate, the preparation time of this method is too long, the equipment investment is large, and the process conditions are relatively harsh

Chinese patent: CN1450123A discloses an invention patent titled "Preparation Method of Nanostructure Titanium Dioxide Photocatalytic Coating", which uses titanium-containing compound as raw material liquid, and adopts liquid thermal spraying method to form nanostructure titanium dioxide photocatalysis on the surface of the substrate For coating, the substrate temperature can be controlled below 100°C. This method needs to generate high-temperature and high-speed spraying flames, which consumes a lot of energy and complicated equipment.

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