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Method for preparing high- stable neutral mixed crystal nanometer TiO2 hydrosol

A hydrosol, high stability technology, used in chemical instruments and methods, titanium oxide/hydroxide, physical/chemical process catalysts, etc., can solve the problem that organic matter cannot be degraded by photocatalysis, and achieve stable TiO2 sol with good transparency. , The effect of easy spraying

Active Publication Date: 2008-11-19
SHANGHAI UNIV
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Problems solved by technology

Japanese patent JP2005-169160 discloses a method of using titanium tetrachloride as a precursor to prepare SiO 2 Coated neutral nano-TiO 2 The method of sol, but the sol has the function of shielding ultraviolet rays and cannot be used in the field of photocatalytic degradation of organic matter

Method used

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Embodiment 1

[0024] The preparation process and steps in this embodiment are as follows:

[0025] TiO in this example 2 The composition and weight percentage of the hydrosol are controlled as: TiO 2 4%, SiO 2 2.5%, metal salt SnCl 4 0.5%, 93% deionized water.

[0026] Take titanium tetrachloride as a raw material and dissolve it in water to form a solution. Add sodium hydroxide solution to the titanium tetrachloride solution under stirring, and adjust the pH value of the solution to neutral; after the reaction is completed, filter, and wash the precipitate obtained in the reaction with deionized water until the filtrate is conductive The rate is less than 100μS / cm. Then add acid gel, add nitric acid solution, add nitric acid according to the molar ratio of titanium tetrachloride to nitric acid of 1.4:1, and gel at 95°C for 40 minutes. Then add a certain amount of SiO 2 Sol and metal salt SnCl 4, Let it continue to react for 2 hours; then add lye to adjust the pH of the solution to 7. Then filt...

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Abstract

The invention relates to a method for preparing a neutral mixed crystal nano TiO2 hydrosol with high stability, belonging to the photocatalytic active nano titanium dioxide material preparation process technical field. The method comprises the main steps that: 1. a titanium compound is hydrolyzed by aqueous slkali and deposited, filtered and washed; 2. products obtained are added in an acid solution and peptized at the temperature of between 60 and 100 DEG C, and added with a certain amount of SiO2 sols used as a stabilizer and metal salt used as a doping agent to be continuously reacted for a period of time; 3. the mixture is added with alkaline liquor for adjusting the pH value to between 7 and 8; 4. the mixture is filtered and washed, and filter cakes are dissolved in a certain amount of water and redispersed, and finally the neutral mixed crystal nano TiO2 sol with high stability is obtained. The TiO2 compound hydrosol prepared by the invention is neutral and has good transparency and stability, and the crystal form ratio of anatase and rutile is controllable, and the spectral response range is wide; the TiO2 hydrosol prepared by the invention is convenient in coating operation; moreover, the hydrosol can utilize the solar energy to complete sewage disposal, air purification, antibiotic treatment and glass film coating treatment, etc.

Description

Technical field: [0001] The invention relates to a highly stable neutral mixed crystal nano TiO 2 The preparation method of the hydrosol belongs to the technical field of the preparation process of the photocatalytic active nanometer titanium dioxide material. Background technique: [0002] Nano-titanium dioxide has excellent photocatalytic activity and can effectively mineralize organic pollutants into CO 2 , H 2 O and inorganic acid have the advantages of corrosion resistance, stable properties and non-toxicity. [0003] Nano TiO 2 Sol is a highly dispersed, crystallized hydrocolloid, which is different from a titanium dioxide powder suspension dispersed by a dispersant. The sol can be synthesized directly from a titanium source without being prepared into a powder. The crystallized sol can avoid the agglomeration problem of the calcination process, so the product has good dispersion, good stability and convenient modification. Secondly, the sol is more hydrophilic than the sus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 施利毅袁帅张美红方建慧赵尹
Owner SHANGHAI UNIV
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