Method for preparing anatase nano-titanium dioxide by pulsed electromagnetic field

A nano-titanium dioxide, pulsed electromagnetic field technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of strict material and safety requirements, difficult separation of additives and powder, difficult particle size control, etc., to achieve equipment Small footprint, good dispersion, small particle size effect

Inactive Publication Date: 2017-12-05
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical precipitation method is simple to operate, but it is easy to introduce impurities, the particle size is not easy to control, and the product loss is relatively large
Preparation of Nano TiO by Hydrothermal Method 2 The key problem is that the equipment has to go through high temperature and high pressure, so the material and safety requirements are stricter, and the cost is higher
The sol-gel method is a low-temperature process for preparing nano-powders. The obtained products have the advantages of high purity, small particle size, and narrow particle size distribution. However, the phenomenon of powder particle agglomeration is obvious. The usual method is to Add surfactants to reduce surface energy and improve powder agglomeration, but this will easily cause the problem of difficult separation of additives and powder

Method used

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  • Method for preparing anatase nano-titanium dioxide by pulsed electromagnetic field
  • Method for preparing anatase nano-titanium dioxide by pulsed electromagnetic field
  • Method for preparing anatase nano-titanium dioxide by pulsed electromagnetic field

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 ,Such as figure 2 As shown, the preparation of anatase nano-TiO 2 The method is as follows:

[0028] 1.1. Take a certain amount of absolute ethanol and put it into a beaker as a solvent. According to the volume ratio of butyl titanate and absolute ethanol as 1:2, add butyl titanate to absolute ethanol. After the addition is complete, continue to stir for 10 minutes , until uniformly mixed to obtain a dilute butyl titanate solution (A solution);

[0029] 1.2. Mix water and absolute ethanol evenly according to the volume ratio of 1:4, and prepare ethanol aqueous solution;

[0030] 1.3. Add an appropriate amount of glacial acetic acid to the aqueous ethanol solution to adjust the pH of the aqueous ethanol solution to 3.5 (solution B);

[0031] 1.4. Take 35mL of the ethanol aqueous solution whose pH value was adjusted in step 1.3, stir it mechanically at a speed of 800r / min, and add 28mL of dilute butyl titanate solution to react at a rate of 10mL / min....

Embodiment 2

[0034] 1.1. Take a certain amount of absolute ethanol and put it into a beaker as a solvent. According to the volume ratio of butyl titanate and absolute ethanol as 1:3, add butyl titanate to absolute ethanol. After the addition is complete, continue to stir for 5 minutes , until uniformly mixed to obtain a dilute butyl titanate solution;

[0035] 1.2. Mix water and absolute ethanol evenly according to the volume ratio of 1:5, and prepare ethanol aqueous solution;

[0036] 1.3. Add an appropriate amount of glacial acetic acid to the aqueous ethanol solution to adjust the pH of the aqueous ethanol solution to 4;

[0037] 1.4. Take 30 mL of the ethanol aqueous solution whose pH value was adjusted in step 1.3, mechanically stir at a speed of 500 r / min, and drop 30 mL of dilute butyl titanate solution to react at a rate of 15 mL / min. The system is treated with a pulsed electromagnetic field. During the pulsed electromagnetic field treatment, the pulse time is 0.5min, the pulse vo...

Embodiment 3

[0040]1.1. Take a certain amount of absolute ethanol and put it into a beaker as a solvent. According to the volume ratio of butyl titanate and absolute ethanol as 1:1, add butyl titanate to absolute ethanol. After the dropwise addition, continue to stir for 5 minutes , until uniformly mixed to obtain a dilute butyl titanate solution;

[0041] 1.2. Mix water and absolute ethanol evenly according to the volume ratio of 1:3, and prepare ethanol aqueous solution;

[0042] 1.3. Add an appropriate amount of glacial acetic acid to the aqueous ethanol solution to adjust the pH of the aqueous ethanol solution to 3;

[0043] 1.4. Take 30mL of the ethanol aqueous solution whose pH value was adjusted in step 1.3, stir it mechanically at a speed of 1000r / min, and add 20mL of dilute butyl titanate solution to react at a rate of 5mL / min. The system is treated with a pulsed electromagnetic field. During the pulsed electromagnetic field treatment, the pulse time is 5min, the pulse voltage is...

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Abstract

A method for preparing anatase-type nano-titanium dioxide in a pulsed electromagnetic field comprises diluting butyl titanate with absolute ethanol to obtain a butyl titanate dilution; adjusting the pH value of the ethanol aqueous solution with acetic acid; combining the ethanol aqueous solution adjusted to pH Add butyl titanate diluent, apply pulsed electromagnetic field treatment to the reaction system while adding butyl titanate diluent, and obtain a mixed solution; put it in a vacuum drying oven to dry, and grind the obtained solid particles into powder, put it into a muffle In the furnace, the anatase nano-TiO2 powder is obtained by roasting. The advantages are: the agglomeration of the hydrolyzate particles is suppressed by the pulsed electromagnetic field, and the particle size is effectively reduced. Therefore, no surfactant is needed, the problem of difficult separation of the product and the additive is avoided, and impurities are not brought into the reaction system. The anatase titanium dioxide has the advantages of small particle size, uniform particle size and good dispersibility.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing anatase nano-titanium dioxide by a pulsed electromagnetic field. Background technique [0002] Titanium dioxide, commonly known as "titanium dioxide", is the naturally occurring TiO 2 There are three crystal forms: rutile, anatase and brookite. Anatase nano-TiO 2 It is an excellent semiconductor photocatalyst. It has high catalytic activity and small particle size, generally ultra-fine particles below 100nm, preferably quantum-sized particles below 10nm; the particle size distribution is narrow and monodisperse; the crystallinity is good, the crystal grains are well developed, and there are few Even defect-free; in addition to large specific surface area, no hard agglomerates. It has potential application prospects in photocatalysis, air purification, solar cells, ultraviolet absorbers, sunscreen skin care cosmetics, fine ceramics and g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053B82Y30/00
Inventor 彭淑静王建中唐立丹王冰齐锦刚张震斌
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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