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Method for deciding coating (or not) titanium dioxide type optical catalyst on metal surface

A technology of titanium dioxide and photocatalyst, which can be used in measurement devices, instruments, scientific instruments, etc., and can solve problems such as film corrosion without considering

Inactive Publication Date: 2007-07-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, spraying titanium dioxide film on the surface of metal materials does not consider the corrosion effect of the film on the metal substrate, which is counterproductive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Preparation of titania sol-type photocatalyst

[0015] Add 1.1ml of concentrated nitric acid (68%) into 150ml of deionized water to make a uniform solution, slowly drop 17.0ml of tetraisopropyl titanate into the acidic aqueous solution under vigorous stirring, and hydrolyze the obtained suspension containing white precipitate , the suspension was continuously stirred at 40 °C until the white precipitate dissolved to form a homogeneous transparent sol. Put the sol into a dialysis membrane bag and perform dialysis treatment with 2L deionized water, and change the water every 12 hours until the final pH value of the dialysis water is 3.2. The sol was taken out from the dialysis bag to prepare a titanium dioxide sol-type photocatalyst with a concentration of about 2.5 wt%.

[0016] (2) Preparation of titanium dioxide film samples on the surface of aluminum alloy and stainless steel

[0017] Clean and dry the surface of a certain grade of aluminum alloy and a certain g...

Embodiment 2

[0025] Utilize the composite titania type liquid photocatalyst containing silicon dioxide (titanium dioxide weight content is 2.3%, silicon dioxide weight content is 1.1%), according to embodiment 1 method in aluminum alloy and stainless steel (this material is consistent with embodiment 1) The surface is coated with a layer of composite titanium dioxide photocatalytic film, and the work functions of the photocatalytic film on the surface of the aluminum alloy and stainless steel samples are measured to be 4.20eV and 4.25eV, respectively. Further, the work function of this photocatalytic film is compared with the base metal sample, and it is judged that: the work function of the aluminum alloy is smaller than that of the photocatalytic film on its surface, and its surface is not suitable for coating this photocatalyst; High work function, its surface can be coated with this photocatalyst.

[0026] The surface corrosion resistance of the photocatalytic thin film sample was test...

Embodiment 3

[0028]Utilize the composite titania type photocatalyst (titanium dioxide weight content is 2.5%, the aluminum oxide weight content is 0.2%) containing aluminum oxide, a kind of brass (copper-zinc alloy) is coated with one deck composite by the method in embodiment 1 For the titanium dioxide photocatalytic film, the work functions of the brass metal and the photocatalytic film on the surface of the sample are measured to be 4.5eV and 4.2eV, respectively. Comparing the size of the work function of the two, since the work function of the brass metal is greater than the work function of the photocatalytic film on its surface, the photocatalytic film can be coated on the surface to realize photocatalytic functionalization.

[0029] Further test the surface corrosion resistance of the photocatalytic thin film sample according to the method of Example 1. It was found that the surface of the photocatalytic thin film sample on the brass surface did not change, indicating that the brass...

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Abstract

A method for judging whether it is suitable to coat titanium dioxide catalyst on metal surface or not includes comparing work function of metal with work function of titanium dioxide catalyst, confirming that it is suitable to coat titanium dioxide catalyst on metal surface if metal work function is less than work function of titanium dioxide catalyst or otherwise confirming that it is not suitable to coat titanium dioxide catalyst on metal surface.

Description

technical field [0001] The invention relates to a technology for coating the surface of various metal building materials with a titanium dioxide photocatalyst to make the surface photocatalytically functionalized, in particular to a method for judging whether the metal surface is suitable for coating a titanium dioxide photocatalyst. Background technique [0002] Titanium dioxide-based photocatalysts are widely used on the surfaces of buildings and building materials because of their photocatalytic oxidation of pollutants and self-cleaning effect. Coating a layer of titanium dioxide film on the exterior wall tiles, exterior wall coatings, and curtain wall glass of buildings can not only play a self-cleaning role, but also photocatalyze the removal of NO in the air 2 and SO 2 ; Coating a layer of titanium dioxide film on the surface of floor tiles and concrete can also play a role in removing air pollutants. The above-mentioned building substrates are usually referred to as...

Claims

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Application Information

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IPC IPC(8): G01N35/00G01N23/227G01N23/225
Inventor 付贤智戴文新刘平邵宇员汝胜陈旬丁正新王绪绪
Owner FUZHOU UNIV
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