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Synthetic method of nano titanium dioxide powder

A nano-titanium dioxide, synthesis method technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve the problems of equipment and experimental personnel hazards, operation hazards, high reaction temperature, and achieve good water and ethanol dispersibility, Ease of operation, low synthesis temperature effect

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual hydrothermal method can realize the shape control of titanium dioxide, but the previously published materials mostly use highly corrosive acids or alkalis as solvents, the reaction temperature is high, and the operation is more dangerous, which may cause harm to equipment and experimenters.

Method used

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  • Synthetic method of nano titanium dioxide powder
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Examples

Experimental program
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Effect test

Embodiment 1

[0039] Under the condition of room temperature and magnetic stirring, 20 mL of tetraisopropyl titanate was dropped into 100 mL of distilled water at 10 mL / min, and a white precipitate gradually appeared. The white precipitate was separated by suction filtration, and the filter cake was put back into distilled water, stirred for 20 minutes, and then separated by suction filtration. This process was repeated 3 times. After mixing the white product with 200 mL of water, 8 mL of a 25 wt % tetrapropylammonium hydroxide aqueous solution was added and stirred for 2 hours. Transfer the above solution to a 500mL static reaction kettle, seal it, put it in a drying oven at 80°C for 24 hours of constant temperature reaction, add 4.5mL of glacial acetic acid, raise the temperature of the oven to 120°C, and react at constant temperature for 24 hours. Take out the reaction kettle, and after cooling down to room temperature naturally, the white powder will be separated by centrifugation. Rin...

Embodiment 2

[0041] According to the process of Example 1, with TiCl 4 For titanium precursor, TiCl 4 The addition amount was 5 mL, the sample treatment conditions were the same as in Example 1, and the product B was obtained, which was used for transmission electron microscope observation and XRD analysis. The transmission electron microscope structure showed that the particle size of titanium dioxide was about 20 nm; XRD diffraction results showed that titanium dioxide was an anatase structure.

Embodiment 3

[0043] 25 mL of tetrabutyl titanate was dropped into 120 mL of deionized water to form a white precipitate. The following process was the same as in Example 1, except that the hydrothermal treatment temperature was 140° C. and the reaction time was 12 hours. The obtained product C was used for transmission electron microscope observation and XRD diffraction experiment. Transmission electron microscope results showed that the size of titanium dioxide was about 15 nm; XRD results showed that titanium dioxide had an anatase structure.

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Abstract

The invention discloses a synthetic method of nano anatase titanium dioxide powder. The method comprises the following steps: 1) dropping a titanium oxide precursor in water, performing a hydrolysis reaction to obtain white precipitate, after reaction is completed, obtaining a solid-liquid mixture; 2) adding an alkyl ammonium hydroxide solution in the mixture obtained in the step 2), uniformly mixing the materials and aging the materials; and 3) adding a glacial acetic acid solution in the aged product obtained in the step 2), performing a constant temperature reaction, after the reaction is completed, separating the product, cleaning the product and drying the product to obtain the nanometer titanium dioxide powder. The method has the advantages of simple process, low synthesis temperature, mild condition, easy operation and high output, the size of the prepared titanium oxide nanoparticle is small, and the method is suitable for preparing a catalyst for selective catalytic denitration or a photocatalysis.

Description

technical field [0001] The invention belongs to the field of synthesis of nanometer materials, and in particular relates to a synthesis method of anatase nano titanium dioxide powder. Background technique [0002] Generally, there are two methods for preparing titanium dioxide powder, one is sulfuric acid method and chlorination method. The traditional method of titanium dioxide synthesis is sulfuric acid method, but sulfuric acid method has serious environmental pollution and serious equipment loss, and is gradually replaced by chlorination method. The sulfuric acid method can produce titanium dioxide powder including anatase structure and rutile structure; while the chloride method can only produce rutile titanium dioxide powder. In addition to its important application in photocatalysis, the current titanium dioxide powder with anatase structure also occupies a large SCR market share and has a very good application prospect. Therefore, the development of a low-cost, high-...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y30/00
Inventor 郭长友凌凤香王少军沈智奇杨卫亚季洪海王丽华
Owner CHINA PETROLEUM & CHEM CORP
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