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Low temperature method for preparing Nano powder

A nano-powder, low-temperature technology, applied in the field of environmental purification, can solve the problems of complicated preparation methods and many drugs, and achieve the effects of simple preparation process, high photocatalytic activity and energy saving.

Inactive Publication Date: 2007-05-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the precursor of nano-titanium dioxide involved in this technology requires alcohol as a solvent, and a template agent needs to be added, which requires more drugs, and the preparation method is more cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Under magnetic stirring, slowly add tetrabutyl titanate dropwise in the ice solution of nitric acid, stir at room temperature for 24 hours, the solution is separated after standing, the upper layer is butanol produced by hydrolysis, and the lower layer is transparent titanium dioxide hydrosol , and liquid-separated to obtain a titanium dioxide hydrosol, which is ready for use. The molar concentration of nitric acid in the ice solution of nitric acid used is 0.05mol / L, and the molar concentration of tetrabutyl titanate in the titanium dioxide hydrosol is 0.2mol / L;

[0014] 2. Dry the above-mentioned titanium dioxide hydrosol at room temperature, grind it, and put it in an oven for 3 hours at 120°C to obtain TiO 2 Nano powder with a specific surface area of ​​144.2m 2 / g;

[0015] 3. TiO prepared at low temperature 2 Nano-powder, the test of the degradation rate of high-concentration acetaldehyde gas shows that the degradation rate of the powder to acetaldehyde reac...

Embodiment 2

[0017] 1. Under magnetic stirring, slowly add tetrabutyl titanate dropwise in the ice solution of nitric acid, stir at room temperature for 36 hours, the solution is separated after standing, the upper layer is butanol produced by hydrolysis, and the lower layer is transparent titanium dioxide hydrosol , and liquid-separated to obtain a titanium dioxide hydrosol, which is ready for use. The molar concentration of nitric acid in the ice solution of nitric acid used is 0.1mol / L, and the molar concentration of tetrabutyl titanate in the titanium dioxide hydrosol is 0.6mol / L;

[0018] 2. Dry the above-mentioned titanium dioxide hydrosol at room temperature, grind it, and put it in an oven for 3 hours at 150°C to obtain TiO 2 Nano powder, the specific surface area is 153.1m 2 / g;

[0019] 3. TiO prepared at low temperature 2 Nano-powder, the test of the degradation rate of high-concentration acetaldehyde gas shows that the degradation rate of the powder to acetaldehyde reaches 6...

Embodiment 3

[0021] 1. Under magnetic stirring, slowly add tetrabutyl titanate dropwise in the ice solution of nitric acid, stir at room temperature for 48 hours, the solution is separated after standing, the upper layer is butanol produced by hydrolysis, and the lower layer is transparent titanium dioxide hydrosol , and liquid-separated to obtain a titanium dioxide hydrosol, which is ready for use. The molar concentration of nitric acid in the ice solution of nitric acid used is 0.15mol / L, and the molar concentration of tetrabutyl titanate in the titanium dioxide hydrosol is 1mol / L;

[0022] 2. Dry the above-mentioned titanium dioxide hydrosol at room temperature, grind it, and dry it in an oven at 180°C for 3 hours to obtain TiO 2 Nano powder with a specific surface area of ​​167.3m 2 / g;

[0023] 3. TiO prepared at low temperature 2 Nano-powder, the test of the degradation rate of high-concentration acetaldehyde gas shows that the degradation rate of the powder to acetaldehyde reache...

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PUM

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Abstract

This invention relates to a low-temperature method for preparing TiO2 nanopowder. The method comprises: utilizing tetrabutyl titanate as the precursor, dropping into ice water solution containing acid to prepare TiO2 hydrosol, drying at room temperature, and drying at 120-180 deg.C to obtain anatase-type TiO2 nanopowder. This invention utilizes low temperature method, and only adopts aqueous solution of diluted acid as the sovent, thus avoiding alcohol or other stabilizers. The method has such advantages as simple process, low energy consumption and little pollution. The obtained TiO2 nanopowder has large specific surface area and high photocatalytic activity. By rational combination of carrier and UV source, the TiO2 nanopowder can effectively remove organic pollutants.

Description

technical field [0001] The present invention relates to a kind of TiO 2 The preparation method of nanopowder, especially a kind of TiO 2 The invention relates to a low-temperature preparation method of nanometer powder, which belongs to the technical field of environmental purification. technical background [0002] Photocatalysis is an emerging technology for environmental purification. Nano-TiO 2 Photocatalysts can effectively oxidize or reduce harmful gas molecules adsorbed on their surfaces, kill bacteria, inhibit viruses, and convert harmful organic matter and bacteria into harmless substances such as water and carbon dioxide without any secondary pollution. Most of the existing photocatalysts are TiO 2 Nano powder, in order to improve TiO 2 The photocatalytic activity must have higher crystallinity, smaller particle size and higher specific surface area, so that more reactive centers can participate in the reaction and increase the activity. Prepare TiO in variou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 胡海肖文浚袁坚施建伟上官文峰
Owner SHANGHAI JIAO TONG UNIV
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