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Method for preparing nanometer titanium dioxide through low temperature water steaming treatment

A technology of nano-titanium dioxide and water steaming, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of environmental protection, human health, unfavorable batch production, and complicated preparation process, so as to reduce fire hazards, The effect of low catalytic activity and high catalytic activity

Active Publication Date: 2013-11-27
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the above methods mainly use inorganic titanium sources as raw materials, and there are problems such as complicated preparation process, long time consumption, and unfavorable mass production; and TiCl 4 During the hydrolysis process, a large amount of highly corrosive gas hydrogen chloride will be produced, which is not environmentally friendly and will cause damage to human health
In the Chinese patent with the application number 200510039171.6, the organic titanium source is fully mixed with the organic alcohol solvent to obtain a titanium compound alcohol solution, which is then added dropwise into an acidic aqueous solution for hydrolysis, and after reflux at 65-85°C for 6-48 hours, the Evaporate and remove alcohols at 50-55°C to obtain anatase TiO 2 Sol, this process needs to be refluxed at a higher temperature, which is not conducive to mass production, and the organic solvent needs to be removed by evaporation, which has certain pollution to the environment
[0006] In summary, the currently reported low-temperature nano-TiO 2 Although there are many kinds of preparation methods, there are deficiencies in varying degrees from the perspective of industrial production and environmental issues.

Method used

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  • Method for preparing nanometer titanium dioxide through low temperature water steaming treatment
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  • Method for preparing nanometer titanium dioxide through low temperature water steaming treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Under the state of vigorous stirring in a 30°C water bath at normal pressure, the mixed solution of tetrabutyl titanate and glacial acetic acid was added dropwise to the aqueous acetic acid solution, and the pH of the aqueous solution was controlled to be 2-3. The molar ratio of tetrabutyl titanate, deionized water, chelating agent and catalyst is 1:200:5:3. After the dropwise addition was completed, stirring was continued for 2 h. Static to aging for 48h, TiO with blue light is obtained 2 transparent sol. Then the aged nano-TiO 2 The sol was put into a glass watch glass, and dried in a steam system at 100°C under normal pressure for 8 hours to obtain nano-TiO 2 Powder.

[0041] Its XRD patterns and performance indicators are shown in image 3 and Table 2.

[0042] Table 2 TiO prepared under atmospheric pressure steam system 2 Powder properties

[0043]

Embodiment 3

[0045] Under the state of vigorous stirring in a 30°C water bath at normal pressure, the mixed solution of tetrabutyl titanate and glacial acetic acid was added dropwise to the aqueous acetic acid solution, and the pH of the aqueous solution was controlled to be 2-3. The molar ratio of tetrabutyl titanate, deionized water, chelating agent and catalyst is 1:190:5:5. After the dropwise addition was completed, stirring was continued for 2 h. Static to aging for 48h, TiO with blue light is obtained 2 transparent sol. Then the aged nano-TiO 2 The sol was put into a glass watch glass and dried in a steam system at 0.18MPa and 130°C for 6h to obtain TiO 2 Powder. Its XRD see Figure 4 , and the performance is shown in Table 3 below.

[0046] Table 3 TiO prepared under high pressure steam system 2 Powder properties

[0047]

[0048] It can be seen that the nano-TiO obtained by the high-pressure steam drying system 2 The powder has good photocatalytic activity, and the 5mg / ...

Embodiment 4

[0050] A method for preparing nano-titanium dioxide by steaming at low temperature, the process flow is as follows figure 1 shown, including the following steps:

[0051] (1) Mix tetrabutyl titanate and glacial acetic acid evenly to obtain a yellow solution.

[0052] (2) Mix deionized water and glacial acetic acid, pour it into a three-necked flask, put it in a constant temperature water bath at 30°C, and slowly add the yellow solution in step (1) to the aqueous acetic acid solution under stirring with an electric stirrer After dropping, continue to stir vigorously for 2 hours, and after aging for 48 hours, a transparent nano-TiO2 aqueous sol with blue light is obtained. The molar ratio of the tetrabutyl titanate, deionized water, chelating agent and catalyst is 1:200:5:3.

[0053] (3) Select the soft base material cotton fabric as the base material, immerse the aged nano-TiO 2 In the hydrosol, immerse in a water steaming system at normal pressure 100°C for 8 hours, wash an...

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Abstract

The present invention relates to a method for preparing nanometer titanium dioxide through a low temperature water steaming treatment. The method comprises: mixing a titanium source and a chelating agent, and completely and uniformly stirring to obtain a homogeneous yellow solution; completely and uniformly mixing deionized water and a catalyst, and adjusting the pH value of the solution to 2-3; under the state of a water bath and vigorous stirring, slowly adding the yellow solution to the deionized water and catalyst mixed solution in a dropwise manner, continuously and vigorously stirring for 2-6 h after completing the addition, and aging for 24-72 h to obtain the transparent Ti02 hydrosol with blue light; and placing the TiO2 hydrosol on different substrate materials, and placing into a water steaming environment to steam for 6-10 h to obtain nanometer TiO2 with different forms. According to the present invention, the conventional high temperature powder preparation method is broken through; and high catalysis activity nanometer TiO2 with a good dispersion performance can be obtained without addition of any dispersing agents, industrial production is easily achieved, and an application of the nanometer TiO2 in materials with a characteristic of no high temperature resistance is broadened.

Description

technical field [0001] The invention relates to the field of nanometer material science, in particular to a method for preparing nano titanium dioxide by low-temperature steaming treatment, which is used on substrates that are not resistant to high temperatures (such as textiles and plastics). Background technique [0002] Due to its non-toxicity, stable performance, high photocatalytic activity, strong chemical corrosion resistance, non-selective degradation of organic matter in water pollutants, and no secondary pollution, nano-titanium dioxide has become a popular and widely used material nowadays. Foreground photocatalyst. It is widely used in environmental protection fields such as gas purification, treatment of organic pollutants, antibacterial deodorization, anti-fog and self-cleaning coatings. [0003] The preparation methods of nano-titanium dioxide can be classified into three categories: solid-phase method, gas-phase method and liquid-phase method. Each preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 沈勇叶凤英王黎明张惠芳丁颖邹锐黄熠
Owner SHANGHAI UNIV OF ENG SCI
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