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Preparation method of nano-titanium dioxide powder with high ethanol and water dispersibility

A nano-titanium dioxide, dispersive technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of poor crystallinity of nano-titanium dioxide, and achieve good adhesion and high photocatalytic activity.

Active Publication Date: 2016-03-30
柳州若思纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these chelating ligands often have high stability, and the crystallinity of nano-titanium dioxide synthesized at lower temperatures is poor.

Method used

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  • Preparation method of nano-titanium dioxide powder with high ethanol and water dispersibility
  • Preparation method of nano-titanium dioxide powder with high ethanol and water dispersibility
  • Preparation method of nano-titanium dioxide powder with high ethanol and water dispersibility

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Embodiment 1

[0023] A preparation method of high ethanol / water dispersibility nano titanium dioxide powder, specifically comprising the following steps:

[0024] (1) Add the acid to the alcohol solution and mix evenly. The mass ratio of acid to alcohol is 0.05-0.1 to obtain the A solution. Slowly add the titanium alkoxide to the A solution. The mass ratio of the titanium alkoxide to the A solution is 0.05-0.1 , fully stirred for 60-120 minutes to slowly hydrolyze titanium alkoxide in high-concentration acid to obtain B solution;

[0025] (2) Adding water to solution B, the mass ratio of water to solution B is 0.05-0.1, at 65-85°C, reflux reaction for 12-36 hours, so that the titanium dioxide precursor is hydrolyzed, cross-linked and grown in all directions;

[0026] (3) After the reaction system is cooled, the precipitate is filtered, washed, and dried at 50-70° C. under vacuum for 5-15 hours to remove residual acid and solvent to obtain nano titanium dioxide powder.

[0027] The acid in ...

Embodiment 2

[0037]22g of nitric acid was added into 200g of ethanol solution and mixed evenly, then, 22g of isopropyl titanate was slowly added into the mixed solution and stirred for 60 minutes. Add 16.5g of water into the above mixed solution to hydrolyze isopropyl titanate, transfer the mixed solution to a three-necked flask, and reflux at 80°C for 1 hour. After the reflux is completed, cool and centrifuge, and precipitate at 70°C Vacuum drying for 15 hours to remove residual nitric acid and solvent to obtain nano titanium dioxide powder.

Embodiment 3

[0039] 22g of nitric acid was added into 200g of ethanol solution and mixed evenly, then, 22g of isopropyl titanate was slowly added into the mixed solution and stirred for 60 minutes. Add 16.5g of water to the above mixed solution to hydrolyze isopropyl titanate, transfer the mixed solution to a three-necked flask, and reflux at 80°C for 6 hours. After the reflux is completed, cool and centrifuge, and precipitate at 70°C Vacuum drying for 15 hours to remove residual nitric acid and solvent to obtain nano titanium dioxide powder.

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Abstract

The invention discloses a preparation method of nano-titanium dioxide powder with high ethanol and water dispersibility. Titanium alkoxides are selected as a titanium source, acid radical ions with low electronegativity are selected as a stabilizer, the mixture has a low-temperature reflux reaction in an ethanol / water mixed solution, and nano-titanium dioxide crude products are prepared; the nano-titanium dioxide crude products are subjected to filtration, washing, vacuum drying and other processes, and the nano-titanium dioxide powder with the average particle size being about 5 nm is prepared. The crystal forms of titanium dioxide are converted at the low temperature, titanium dioxide is converted from the amorphous state into pure anatase type titanium dioxide; prepared titanium dioxide has high dispersibility, can be dissolved in water and can also be dissolved in the water-ethanol mixed solution, a substrate such as glass or plastic can be directly coated with the dissolved solution, the dissolved solution is cured and forms a film at the normal temperature, the film has high photocatalytic activity under ultraviolet light or visible light and can be used for degrading organic dye, and the prepared coating has good adhesion force.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a preparation method of high ethanol / water dispersibility nano titanium dioxide powder. Background technique [0002] Due to the wide application of nano-TiO2 in photocatalyst, gas sensor, water treatment, etc., the research on nano-TiO2 has been very active. Nano-titanium dioxide has three common crystal forms: brookite type, anatase type, and rutile type. Among them, anatase-type nano-titanium dioxide has a higher mobility rate of photogenerated carriers and a high density of surface hydroxyl groups, and is widely used in Photocatalysis and solar power generation, especially in the photocatalytic degradation of indoor air pollutants. So far, many research groups have developed different single-crystal anatase nano-TiO2 synthesis methods by using wet chemical methods, such as hydrothermal method, sol-gel method, and reverse micellar method. Nano-titanium dioxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
CPCC01G23/053C01P2002/72C01P2002/82C01P2002/88C01P2004/04C01P2004/64
Inventor 白大伟史智鹏程昊郝光明黄彩幸赵斌
Owner 柳州若思纳米材料科技有限公司