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Composite microballoon of monodisperse SiO2 and TiO2 and its prepn process

A titanium dioxide and silicon dioxide technology, applied in the field of monodisperse silicon dioxide and titanium dioxide composite microspheres and their preparation, can solve the problems of easy bonding, poor photocatalytic activity and adsorption capacity, and difficulty in obtaining pure titanium dioxide microsphere particles. , to achieve the effect of high specific surface area and porosity

Inactive Publication Date: 2005-09-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, SiO 2 with TiO 2 Composite microspheres can also prepare photonic crystals. Scholars at home and abroad have tried to assemble photonic crystals with silica or polystyrene spheres, but due to the low refractive index of silica and polystyrene (n=1.4~1.5 ), photonic crystals with complete bandgap structures cannot be obtained
Titanium dioxide has a high refractive index, but its particle size is very uneven and the particles are very easy to bond. It is difficult to obtain pure titanium dioxide microspheres with good monodispersity, and the surface properties of titanium dioxide make it difficult to assemble into an ordered structure.
[0003] However, currently prepared SiO 2 with TiO 2 Composite microspheres are mainly coated with titanium dioxide on solid or low-surface silica microspheres, so that the prepared SiO 2 with TiO 2 The specific surface area of ​​composite microspheres is low, and their photocatalytic activity and adsorption capacity are poor
To the best of our knowledge, there is no literature report relying on the electrostatic attraction method to prepare monodisperse specific surface area > 400m 2 / g SiO 2 with TiO 2 Report on Composite Microspheres

Method used

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  • Composite microballoon of monodisperse SiO2 and TiO2 and its prepn process
  • Composite microballoon of monodisperse SiO2 and TiO2 and its prepn process
  • Composite microballoon of monodisperse SiO2 and TiO2 and its prepn process

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Dissolve dodecylamine in a mixed solution composed of 160 milliliters of ethanol and 100 milliliters of distilled water under the action of magnetic stirring. After the dodecylamine is completely dissolved, add tetraethyl orthosilicate dropwise to the above mixed solution. The molar concentrations of dodecylamine and ethyl tetrasilicate are respectively 0.024 and 0.18 mol / liter; after reacting for 4 hours, a white precipitate is obtained; the white precipitate obtained is filtered, then dried in a vacuum oven at 80°C for 6 hours, Finally, it is calcined at 600° C. for 6 hours in a muffler furnace to obtain monodisperse silica microsphere raw material with high specific surface area. figure 2 It shows the SEM photo of the prepared silica microspheres. It can be seen from the figure that the particles of the silica microspheres are about 600nm, and the particle distribution is uniform and monodisperse. Table 1 shows the prepared SiO 2 The specific surface area and pore ...

Embodiment 2

[0037] Dissolve 11 ml of butyl titanate in 100 ml of distilled water to generate a white precipitate of titanium hydroxide, then filter, redisperse the resulting white precipitate in 100 ml of distilled water under magnetic stirring, and adjust the pH of the suspension with concentrated nitric acid value to 0.7, and finally the mixed solution was kept at 60°C. After 4 hours of degumming, the titanium hydroxide precipitate was completely dissolved to form a light blue transparent titanium dioxide sol, and the molar concentration of titanium dioxide was 0.3 mol / liter.

Embodiment 3

[0039] Weigh 2 grams of the silica microsphere powder obtained in Example 1, ultrasonically disperse it in 80 ml of distilled water, adjust the pH value of the silica suspension to 0.7 with concentrated nitric acid, and then mix 2 ml of the silica microsphere powder in Example 1 with magnetic stirring. 2 Add the obtained titanium dioxide sol to the silica suspension, then adjust the pH value of the mixture to 4 with 0.5 mol / L sodium hydroxide solution, and stir and react at room temperature 25°C for 3 hours to obtain a white turbid suspension solution , filtered, and then washed with absolute ethanol to obtain a white precipitate 4 times. Finally, the obtained white precipitate was dried in a vacuum drying oven at 80°C for 6 hours, and heat-treated at a high temperature of 600°C for 4 hours to obtain SiO containing anatase phase. 2 with TiO 2 Composite microspheres.

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Abstract

The preparation process of composite microballoon of monodisperse SiO2 and TiO2 includes the following steps: preparing monodisperse microporous SiO2 microballoon in sol-gel process and preparing TiO2 sol in acid hydrolysis process; ultrasonically dispersing the SiO2 microballoon in distilled water to form suspension, regulating the acidity of suspension with nitric acid for pH value equal that of TiO2 sol, and adding the TiO2 sol into the suspension; stirring to form homogeneous solution, regulating pH value of the mixture solution to 3-5, and forming deposit of composite microballoon of SiO2 and TiO2; and filtering, washing, vacuum drying and high temperature heat treatment to obtain the composite microballoon of monodisperse SiO2 and TiO2 with specific surface area of 400-950 sq m / g.

Description

technical field [0001] The invention relates to a monodisperse silicon dioxide and titanium dioxide composite microsphere and a preparation method thereof, in particular to making the silicon dioxide microsphere and titanium dioxide colloidal particles carry opposite charges in the solution by adjusting the pH value of the reaction mixture, so that the Titanium dioxide colloidal particles are deposited on the surface of silica microspheres by electrostatic attraction to obtain monodisperse silica and titanium dioxide composite microspheres. Background technique [0002] TiO 2 It is a multifunctional fine inorganic material that has been studied more, and it is also an important ceramic, semiconductor and catalytic material, because of its good weather resistance, chemical corrosion resistance, high chemical stability, non-toxicity, photosensitivity, etc. It is widely used in the fields of coatings, dielectric materials, inks and papermaking due to its excellent performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/46C04B35/624C04B38/00
Inventor 余家国赵丽程蓓
Owner WUHAN UNIV OF TECH
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