Controllable short-process preparation method of nano titanium dioxide

A nano-titanium dioxide, short-process technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of time-consuming, difficult to clean, long preparation cycle, etc., to achieve high utilization rate and controllable synthesis process , the effect of short synthetic route

Active Publication Date: 2013-10-02
NORTHEASTERN UNIV
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Problems solved by technology

This process requires a large amount of organic complexing agents and is time-consuming
The residual organic complexing agent and inorganic ions in the obtained sol are not easy to remove
[0003] Later, it was proposed to use hydrogen peroxide to complex the amorphous titanium dioxide. First, the inorganic precursor of titanium was hydrolyzed, and the adsorbed anions were washed away, and hydrogen peroxide was added. Acting as a complexing agent, aging or hydrothermal reaction to synthesize water-based peroxo titanic acid (hereinafter referred to as PTA) to prepare nano-titanium dioxide. This method does not require the addition of organic complexing agents and reduces organic impurities in the sol Residues have a positive effect on environmental protection, especially conducive to the oxide doping of titanium dioxide to prepare multi-component photocatalysts, but this method requires a long preparation period

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  • Controllable short-process preparation method of nano titanium dioxide
  • Controllable short-process preparation method of nano titanium dioxide
  • Controllable short-process preparation method of nano titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing nanometer titanium dioxide with a controllable short process, which is carried out according to the following steps:

[0025] (1) Under stirring conditions, add butyl titanate to the hydrogen peroxide solution in the water bath for reaction, the amount of butyl titanate added is according to Ti:H 2 o 2 The molar ratio is 1:2, the water bath temperature is 15°C, and the reaction time is 120min, a light orange gel is formed;

[0026] (2) Add an equal volume of deionized water to the light orange gel, heat and reflux to obtain a precipitate, centrifuge, and dry below 120°C to obtain white (sometimes slightly yellow) nanometer titanium dioxide powder.

[0027] The mass percent concentration of hydrogen peroxide is 3.5%.

[0028] X-ray diffraction analysis of nano-titanium dioxide powder shows that the powder is anatase carbon dioxide, such as figure 1 Shown; Laser particle size analysis shows that the powder is 45-60 nanometers, and the maximum par...

Embodiment 2

[0030] A method for preparing nanometer titanium dioxide with a controllable short process, which is carried out according to the following steps:

[0031] (1) Under stirring conditions, add butyl titanate to the hydrogen peroxide solution in the water bath for reaction, the amount of butyl titanate added is according to Ti:H 2 o 2 The molar ratio is 1:5, the temperature of the water bath is 5°C, the reaction time is 198min, and a light orange gel is formed;

[0032] (2) Add an equal volume of deionized water to the light orange gel, heat and reflux to obtain a precipitate, centrifuge, and dry below 120°C to obtain white (sometimes slightly yellow) nanometer titanium dioxide powder.

[0033] The mass percent concentration of hydrogen peroxide is 6%.

[0034] X-ray diffraction analysis of nano-titanium dioxide powder shows that the powder is anatase carbon dioxide; laser particle size analysis shows that the powder is 45-60 nanometers, and the maximum particle size percentage...

Embodiment 3

[0036] A method for preparing nanometer titanium dioxide with a controllable short process, which is carried out according to the following steps:

[0037] (1) Under stirring conditions, add butyl titanate to the hydrogen peroxide solution in the water bath for reaction, the amount of butyl titanate added is according to Ti:H 2 o 2 The molar ratio is 1:15, the temperature of the water bath is 0°C, and the reaction time is 450min, a light orange gel is formed;

[0038] (2) Add an equal volume of deionized water to the light orange gel, heat to reflux to obtain a precipitate, centrifuge, and bake at 300°C for 120 minutes to obtain white (sometimes slightly yellow) nano-titanium dioxide powder.

[0039] The mass percent concentration of hydrogen peroxide is 5%.

[0040] X-ray diffraction analysis of nano-titanium dioxide powder shows that the powder is anatase carbon dioxide, as shown in the figure; laser particle size analysis shows that the powder is 45-60 nanometers, and the...

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Abstract

The invention relates to a controllable short-process preparation method of nano titanium dioxide, and belongs to the field of material preparation. The preparation method comprises the following steps that: (1) butyl titanate is added into a hydrogen peroxide solution in a water bath for reaction for 0-1200min at the water bath temperature of -5-40 DEG C to form light orange gel under a stirring condition; the molar ratio of Ti to H2O2 is 1:(2-30); and (2) isopyknic deionized water is added into the light orange gel for heating reflux to obtain a sediment; and the sediment is subjected to centrifugal separation, and dried below 120 DEG C or roasted at 400-700 DEG C for 30-240min to form nano titanium dioxide powder. With the adoption of the preparation method for preparing nano titanium dioxide, the preparation time can be shortened; reaction and gelling processes can be controlled; an external heating source is not required; a chemical agent can be utilized efficiently; the introduction of impurities can be reduced; prepared nano titanium dioxide has a good photocatalytic performance; and the method has a good market application prospect.

Description

Technical field [0001] The present invention is a material preparation field, which specializes in a preparation method for controllable short -process nano -titanium dioxide. Background technique [0002] Nano -titanium dioxide is a semiconductor material with broad application prospects in optoelectronic transformation, super -affordable coatings, white pigments, anti -ultraviolet protection, ceramics, biometric carriers, photocatalytic and photocatalytic, and some electronic devices.The soluble gel method is an important means to prepare nano -titanium dioxide powder. It has the advantages of simple operation and man -controlled chemical measurement.The traditional soluble gel method is to add water to the titanium titanium front -drive body to form solution. The hydrolysis is achieved by adding acid and complexing agents, and gel is obtained by aging or heat treatment.This process requires a lot of organic linked agents, and it takes more time.The organic linked agents and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y30/00
Inventor 孙挺李振宇孙萌
Owner NORTHEASTERN UNIV
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