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Method for preparing doping titanium dioxide nano crystal

A technology of nanocrystals and titanium dioxide, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems that TiO2 cannot withstand high-temperature heat treatment materials and affect the photocatalytic performance of TiO2, and achieve excellent photocatalysis, simple preparation method, small size evenly distributed effect

Inactive Publication Date: 2008-07-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment process is easy to cause TiO 2 The growth and agglomeration of particles affect the TiO 2 The photocatalytic performance also limits the TiO 2 Application on materials that cannot withstand high temperature heat treatment

Method used

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  • Method for preparing doping titanium dioxide nano crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Mix butyl titanate, vanadyl acetylacetonate and ethanol in a container at a molar ratio of 1:0.15:6 and stir for 30 minutes to obtain liquid A;

[0017] 2) Adjust the pH value of the water to 5 with nitric acid to obtain liquid B, the ratio of the moles of water to the sum of the moles of butyl titanate and vanadyl acetylacetonate is 40;

[0018] 3) Add liquid B into liquid A drop by drop, and stir until a stable sol is formed;

[0019] 4) Pour the sol into a container with a large bottom area, place it to dry under normal temperature and ventilated conditions, remove water and organic solvents, and obtain doped titanium dioxide nanocrystals.

[0020] The transmission electron microscope photo of the prepared doped titanium dioxide crystal is shown in Figure 1, and the upper right corner of the photo is the diffraction ring of the crystal. The X-ray diffraction pattern of the doped titanium dioxide crystal is shown in Figure 2. It can be seen from Fig. 1 and Fig. 2...

Embodiment 2

[0022] 1) Mix isopropyl titanate, niobium hydroxide and ethanol in a container at a molar ratio of 1:0.001:10 and stir for 15 minutes to obtain liquid A;

[0023] 2) Adjust the pH value of the water to 3 with nitric acid to obtain liquid B, the ratio of the moles of water to the sum of the moles of isopropyl titanate and niobium hydroxide is 100;

[0024] 3) Add liquid B into liquid A drop by drop, and stir until a stable sol is formed;

[0025] 4) Pour the sol into a container with a large bottom area, place it to dry under normal temperature and ventilated conditions, remove water and organic solvents, and obtain doped titanium dioxide nanocrystals.

[0026] The obtained anatase phase titanium dioxide crystals have a size of 7 nanometers and a uniform size distribution.

Embodiment 3

[0028] 1) Mix titanium chloride, vanadyl acetylacetonate and propanol in a container at a molar ratio of 1:0.3:18 and stir for 30 minutes to obtain liquid A;

[0029] 2) adjust the pH value of the water to 2 with hydrochloric acid to obtain liquid B, the ratio of the moles of water to the sum of the moles of titanium chloride and vanadyl acetylacetonate is 150;

[0030] 3) Add liquid B into liquid A drop by drop, and stir until a stable sol is formed;

[0031] 4) Pour the sol into a container with a large bottom area, place it to dry under normal temperature and ventilated conditions, remove water and organic solvents, and obtain doped titanium dioxide nanocrystals.

[0032] The obtained anatase phase titanium dioxide crystals have a size of 6 nanometers and uniform size distribution.

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Abstract

The invention discloses a process for preparing doped titanium dioxide nanocrystal, the steps comprise as follows that compounds of titanium and to-be-doped compounds with elements are dissolved in organic solvent, then fluid A is obtained, the fluid A is slowly dropped into the aqueous solution pH value of which is less than 6, then, the aqueous solution is stirred to form stable colloidal sols, lastly, the colloidal sols are dried. The invention doesn't need special devices and high temperature conditions, the process of preparation is simple, and the colloidal sols of the doped titanium dioxide nanocrystal which are of pure anatase phase structure can be obtained at standard temperature. The obtained nanocrystal particles of doped titanium dioxide is uniform in size distribution, and the diameter of the nanocrystal particles is less than 10 nanometers, which is provided with excellent functions of photocatalysis, deodorization and sterilization.

Description

technical field [0001] The invention relates to a method for preparing doped titanium dioxide nanocrystals. Background technique [0002] Metal oxide semiconductor titanium dioxide (TiO 2 ) is a wide-bandgap semiconductor material with a bandgap width of about 3.0-3.41eV, transparent in the wavelength range of 0.35-12μm, high refractive index, high mechanical properties, and stable chemical properties. Anatase TiO 2 With photocatalytic properties, in many photocatalysts (TiO 2 , ZnO, Fe 2 o 3 , CdS, etc.), TiO 2 It is valued by people because of its non-toxic, high catalytic activity, good stability, cheap and easy to get. Use it to photocatalytically degrade organic pollutants in water, and finally generate non-toxic and tasteless CO 2 , H 2 O and some simple inorganic substances. TiO 2 It can only absorb light in the ultraviolet band, making its photocatalytic efficiency low under daily conditions. Therefore, researchers have solved this problem by means of dopi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053
Inventor 赵高凌李红韩高荣
Owner ZHEJIANG UNIV
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