Preparation of iron-doped nitrogen-doped nano titanium dioxide powder

A nano-titanium dioxide, titanium dioxide technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide and other directions, can solve the problems of affecting the absorption of titanium dioxide powder, affecting the nano-effect of powder, particle growth, etc. Catalytic performance, expanding the wavelength of light response, and improving the effect of photocatalytic efficiency

Inactive Publication Date: 2009-07-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although increasing the calcination temperature in the doping process is conducive to the incorporation of impurities such as iron and nitrogen into the interior of the nanoparticles, but if the calcination temperature is too high, the particles of nano-titanium dioxide will grow up, which will affect the nano-effect of the powder, and then affect the improvement. The absorption of light by activated titanium dioxide powder and its photocatalytic performance
The above problems have brought certain difficulties to the modification of nano-titanium dioxide, especially physical modification, and have also restricted the performance of modified nano-titanium dioxide to a large extent.

Method used

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  • Preparation of iron-doped nitrogen-doped nano titanium dioxide powder
  • Preparation of iron-doped nitrogen-doped nano titanium dioxide powder
  • Preparation of iron-doped nitrogen-doped nano titanium dioxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Fix a three-necked bottle with a capacity of 1000mL in an ice-water bath, take 300mL of pure water (H20) and put it into the three-necked bottle; install a condenser tube on the middle port of the three-necked bottle, and use tap water to condense; install Contact thermometer to monitor and control the temperature of the reaction system; take TiCl 4 Put 300mL into a dry constant-pressure separating funnel, and install the constant-pressure separating funnel on the other side port of the three-necked flask; under the conditions of magnetic stirring and ice-water bath cooling, turn on the switch of the constant-pressure separating funnel, The titanium chloride solution is slowly dropped into pure water, and the temperature of the entire dropping and mixing process is controlled at about 40°C by controlling the dropping speed and the temperature of the ice-water bath; with the addition of titanium tetrachloride, the color of the system gradually changes, From colorless...

Embodiment 2

[0038] (1) Fix a three-necked bottle with a capacity of 1000mL in an ice-water bath, take pure water (H 2 (2) 400mL is packed in the there-necked bottle; A condenser is installed on the middle port of the there-necked bottle, and utilizes tap water to condense; A contact type thermometer is installed on a mouth of the there-necked bottle, to monitor and control the temperature of the reaction system; Take TiCl 4 150mL was put into a dry constant pressure separating funnel, and the constant pressure separating funnel was installed on the other side port of the three-necked flask; under the conditions of magnetic stirring and ice-water bath cooling, the switch of the constant pressure separating funnel was turned on, The titanium chloride solution is slowly dropped into pure water, and the temperature of the entire dropping and mixing process is controlled at about 10°C by controlling the dropping speed and the temperature of the ice-water bath; with the addition of titanium tet...

Embodiment 3

[0045] (1) Fix a three-neck bottle with a capacity of 100mL in an ice-water bath, take pure water (H 2 (2) 400mL is packed in the there-necked bottle; A condenser is installed on the middle port of the there-necked bottle, and utilizes tap water to condense; A contact type thermometer is installed on a mouth of the there-necked bottle, to monitor and control the temperature of the reaction system; Take TiCl 4 Put 100mL into a dry constant-pressure separating funnel, and install the constant-pressure separating funnel on the other side port of the three-necked flask; under the condition of magnetic stirring and ice-water bath cooling, turn on the switch of the constant-pressure separating funnel, The titanium chloride solution is slowly dropped into the pure water, and the temperature of the whole dropping and mixing process is controlled at about 0°C by controlling the dropping speed and the temperature of the ice-water bath; with the addition of titanium tetrachloride, the col...

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Abstract

The invention discloses a method for preparing iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method comprises the steps of preparing titanium tetrachloride raw material to be hydrosol, aging the hydrosol, adding water for dilution, doping water-soluble iron salt, raising temperature to hydrolyze sol and produce precipitate, filtering the precipitate, using water to wash the precipitate, drying the precipitate, obtaining iron-doped nanometer titanium dioxide powder, mixing and then ball-milling nitrogen salt and the iron-doped nanometer titanium dioxide powder, calcining the ball-milled powder, and cooling the powder to obtain the iron-doped nitrogen-doped nanometer titanium dioxide powder. The preparation method combines a chemical method with a physical method so as to allow iron to uniformly enter a crystal lattice structure of titanium dioxide on the one hand, and to uniformly distribute nitrogen in surface layers of nanometer particles, particularly non-crystallization layers on the other hand. The iron-doped nitrogen-doped nanometer titanium dioxide powder can improve the photocatalysis efficiency of titanium dioxide on the one hand, and can expand the photoresponse wavelength of titanium dioxide so as to greatly improve photocatalysis properties.

Description

(1) Technical field [0001] The invention relates to a method for modifying nanometer titanium dioxide powder, in particular to a method for preparing iron-doped nitrogen-doped nanometer titanium dioxide powder. (2) Background technology [0002] Nano-titanium dioxide has good photocatalytic performance. The absorption band in the photocatalytic process is mainly ultraviolet light, and the proportion of ultraviolet light in sunlight is small, which affects the photocatalytic performance of nano-titanium dioxide to a certain extent. It restricts the application of nano titanium dioxide in daily life. In order to change this situation, improve the photocatalytic efficiency of nano-titanium dioxide under sunlight, and bring it to practical application, nano-titanium dioxide is modified, and the absorption band in the photocatalytic process is expanded from ultraviolet light to visible light, expanding its To improve its photocatalytic performance in the light absorption band, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01J21/06
Inventor 李国华
Owner ZHEJIANG UNIV OF TECH
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