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Self-cleaning nitrogen-doped titanium oxide film as well as preparation method and applications thereof

A titanium dioxide, self-cleaning technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of high cost, insignificant improvement, improved photocatalytic efficiency, etc., to prevent pollution, improve catalytic efficiency, and good film-forming properties. Effect

Inactive Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

General nitrogen doping process, such as sputtering, vapor deposition or in NH 3 Or calcined in an Ar atmosphere, the process is more complicated, the cost is relatively high, and the visible light catalytic efficiency needs to be improved
Nitrogen sources for nitrogen-doped titanium dioxide films produced by sol-gel method are generally urea, triethanolamine, etc. Although the visible light catalytic efficiency of the films has been improved, the improvement is not obvious

Method used

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  • Self-cleaning nitrogen-doped titanium oxide film as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Mix butyl titanate and absolute ethanol uniformly at a volume ratio of 1:2, then add acetylacetone under stirring, stir for 15 minutes, and mix uniformly to obtain a light yellow solution A; the volume fraction of acetylacetone is 3 %.

[0030] 2) Mix ionized water, hydrochloric acid, and absolute ethanol uniformly according to a volume ratio of 1:0.3:10, add polyvinylpyrrolidone, and stir for 10 minutes to obtain a transparent solution B; wherein polyvinylpyrrolidone accounts for 2% of the total mass of the solution, wherein The mass fraction of hydrochloric acid is 36%.

[0031] 3) Drop the transparent light yellow solution A into the transparent solution B drop by drop, and the volume ratio of solution A to solution B is 1:1, after stirring at room temperature for 2 hours, a uniform sol C is formed; the homogeneous sol is aged at room temperature for 12 hours to obtain Sol required for coating.

[0032] 4) Put the ceramic substrate to be coated into a mixed solu...

Embodiment 2

[0046] 1) Mix butyl titanate and absolute ethanol uniformly at a volume ratio of 1:5, then add acetylacetone under stirring, stir for 15 minutes, and mix uniformly to obtain a light yellow solution A; the volume fraction of acetylacetone is 2 %.

[0047] 2) Mix ionized water, hydrochloric acid, and absolute ethanol uniformly according to a volume ratio of 1:0.2:5, add polyvinylpyrrolidone, and stir for 15 minutes to obtain a transparent solution B; wherein polyvinylpyrrolidone accounts for 5% of the total mass of the solution, wherein The mass fraction of hydrochloric acid is 36%.

[0048] 3) Drop the transparent light yellow solution A into the transparent solution B drop by drop, and the volume ratio of solution A to solution B is 1:2, after stirring at room temperature for 3 hours, a uniform sol C is formed; the homogeneous sol is aged at room temperature for 24 hours to obtain Sol required for coating.

[0049] 4) Put the substrate to be coated into a mixed solution of d...

Embodiment 3

[0053] 1) Mix butyl titanate and absolute ethanol uniformly at a volume ratio of 1:3, then add acetylacetone under stirring, stir for 15 minutes, and mix uniformly to obtain a light yellow solution A; the volume fraction of acetylacetone is 2% .

[0054] 2) Mix ionized water, hydrochloric acid, and absolute ethanol uniformly according to the volume ratio of 1:0.5:15, add polyvinylpyrrolidone, and stir for 30 minutes to obtain a transparent solution B; wherein polyvinylpyrrolidone accounts for 1% of the total mass of the solution, wherein The mass fraction of hydrochloric acid is 36%.

[0055] 3) Drop the transparent light yellow solution A into the transparent solution B drop by drop, and the volume ratio of solution A to solution B is 1:0.5, and stir at room temperature for 3 hours to form a uniform sol C; the homogeneous sol is aged at room temperature for 36 hours to obtain Sol required for coating.

[0056] 4) Put the ceramic substrate to be coated into a mixed solution ...

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Abstract

The invention discloses a self-cleaning nitrogen-doped titanium oxide film as well as a preparation method and applications thereof. The preparation method comprises steps as follows: butyl titanate, absolute ethyl alcohol and acetylacetone are evenly mixed, and a solution A is obtained; deionized water, hydrochloric acid, absolute ethyl alcohol and polyvinylpyrrolidone are evenly mixed, and a solution B is obtained; the solution A is added to the solution B dropwise, stirring is performed, and sol C is obtained through ageing or without ageing; a to-be-coated substrate which is washed clean is soaked in the sol C and lifted vertically at the constant speed for coating, then drying and calcination are performed, and the self-cleaning nitrogen-doped titanium oxide film with the thickness ranging from 0.2 mu m to 10 mu m is obtained. According to the method, technological equipment is simple, the cost is low, the film-forming property and the repeatability are good, the prepared film has the good hydrophilia, and the hydrophilia and the methylene blue degradation efficiency of the film are obviously higher than those of a common titanium oxide film under visible light irradiation.

Description

technical field [0001] The invention relates to a self-cleaning film, in particular to a nitrogen-doped titanium dioxide self-cleaning film and its preparation method and application. Background technique [0002] Titanium dioxide has a photocatalytic effect under ultraviolet light irradiation, and has the function of degrading many organic substances. Coating titanium dioxide film on the surface of ceramics or glass can effectively improve the self-cleaning effect of their surfaces. However, titanium dioxide has catalytic performance only under the irradiation of ultraviolet light, and its utilization rate of visible light is low, which greatly affects its degradation efficiency of general organic matter. In order to broaden the application range of titanium dioxide and improve the photocatalytic effect of titanium dioxide, many scholars have carried out metal ion Fe on titanium dioxide. 3+ ,Co 2+ , Cr 3+ , Ni + , Mo 5+ , Cu 2+ , Pb 2+ and non-metallic ions N 3- , F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/176C04B41/85A62D101/28
Inventor 饶平根黄习旋储璐赵威
Owner SOUTH CHINA UNIV OF TECH
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