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Preparation method and application of TiO2 photocatalytic coating

A technology of titanium dioxide and photocatalysis, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of limited thickness of the middle layer, poor bonding force, and coating bonding To improve photocatalytic activity, high reuse, and good binding force

Active Publication Date: 2015-05-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, the intermediate layer is obtained by directly dip-coating the precursor solution onto the metal foam, and the obtained intermediate layer has limited thickness and insufficient porosity.
On the one hand, the bonding force between the intermediate layer and the metal foam is poor; on the other hand, the intermediate layer and the subsequent TiO 2 The bonding force of the coating is poor, which greatly limits the subsequent TiO 2 The effect of enhancing the photocatalytic activity is not obvious

Method used

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  • Preparation method and application of TiO2 photocatalytic coating
  • Preparation method and application of TiO2 photocatalytic coating
  • Preparation method and application of TiO2 photocatalytic coating

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preparation example Construction

[0023] The steps of the preparation method of titanium dioxide photocatalytic coating are as follows:

[0024] 1) The foamed metal substrate is degreased by absolute ethanol ultrasonically for 10-30 minutes, rinsed with deionized water and soaked in 1M oxalic acid solution for 1-2 hours, then rinsed with deionized water and soaked in 1M sodium hydroxide solution for 1-2 hours , and finally rinse with deionized water and dry in a 40-100°C constant temperature drying oven for later use;

[0025] 2) Adjust the pH of 50-100mL absolute ethanol, 50-100mL deionized water, 1-10mL tetramethyl silicate or tetraethyl silicate, and 2M nitric acid solution to 2.0-5.0, stir at room temperature for 6-24 hours, and prepare Obtain precursor solution, stand-by;

[0026]3) Add the prepared precursor solution into the three-electrode tank, use the foamed metal substrate as the working electrode, Ag / AgCl as the reference electrode, and the platinum sheet as the counter electrode, control the pote...

Embodiment 1

[0033] The foamed nickel substrate was degreased by absolute ethanol ultrasonically for 10 minutes, rinsed with deionized water, soaked in 1M sodium hydroxide solution for 1 hour, rinsed with deionized water, soaked in 1M oxalic acid solution for 1 hour, and finally rinsed with deionized water Put it into a constant temperature drying oven at 40°C and dry it for later use.

[0034] Adjust the pH to 2.0 with 50 mL of absolute ethanol, 50 mL of deionized water, 1 mL of tetramethyl silicate or tetraethyl silicate, and 2M nitric acid solution, and stir at room temperature for 6 hours to prepare a precursor solution for use;

[0035] Add the prepared precursor solution into the three-electrode tank, use the nickel foam substrate as the working electrode, Ag / AgCl as the reference electrode, and the platinum sheet as the counter electrode. The control potential is -0.5V, the deposition time is 100s, and the deposition temperature is 30 ℃, rinse with deionized water and ethanol in tur...

Embodiment 2

[0041] The nickel foam substrate was degreased by absolute ethanol ultrasonic for 30 minutes, rinsed with deionized water, soaked in 1M sodium hydroxide solution for 2 hours, rinsed with deionized water, soaked in 1M oxalic acid solution for 2 hours, and finally rinsed with deionized water Put it into a constant temperature drying oven at 100°C and dry it for later use.

[0042] Adjust the pH to 5.0 with 100 mL of absolute ethanol, 100 mL of deionized water, 10 mL of tetramethyl silicate or tetraethyl silicate, and 2M nitric acid solution, and stir at room temperature for 24 hours to prepare a precursor solution for use;

[0043] Add the prepared precursor solution into the three-electrode tank, use the nickel foam substrate as the working electrode, Ag / AgCl as the reference electrode, and the platinum sheet as the counter electrode. The control potential is -5.0V, the deposition time is 1000s, and the deposition temperature is 60 ℃, rinse with deionized water and ethanol in s...

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Abstract

The invention discloses a preparation method and application of a TiO2 photocatalytic coating. By means of a method for electrically depositing organic silicane gel-sol precursor solution, a composite coating material having high photocatalytic activity is finally prepared by steps of firstly preparing a layer of inert and porous nano SiO2 intermediate film having high binding force on a foam metal matrix and then loading an anatase type nano TiO2 coating; and the composite coating material is used for degrading organic pollutants in air or sewage by photocatalysis. The SiO2 intermediate layer prepared through the electro-deposition method overcomes the disadvantages of low film thickness, insufficient porosity, low TiO2 loading capacity, poor binding force with a matrix and the like existing in the SiO2 intermediate layer prepared through the conventional dip coating method; furthermore, the thickness of the intermediate layer is adjustable; the binding force between the intermediate layer and the matrix is better; the binding force with a subsequent loaded coating is increased while the loading capacity is increased; the photocatalytic activity is greatly increased; and the preparation method disclosed by the invention is simple to operate, lower in cost and high in repetitive utilization rate and is expected to being applied to industrial production in a large scale.

Description

technical field [0001] The invention relates to the preparation of a photocatalytic coating, in particular to a preparation method and application of a titanium dioxide photocatalytic coating with good binding force and high activity. Background technique [0002] TiO 2 It is an n-type semiconductor, and it is widely used in photocatalytic degradation of organic pollutants in air or sewage because of its advantages of high photocatalytic activity, cheap and easy to obtain, good stability, non-toxic and harmless. But TiO 2 The powder is easy to aggregate and difficult to separate and recover in the suspension system, which hinders its practical application. The catalyst immobilization technology can effectively solve this problem. Due to the high porosity, good mechanical properties, uniform structure and hydrodynamic properties of metal foam materials, metal foam has been used to load TiO more than ten years ago. 2 To prepare photocatalytic materials research and reports,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/745B01J21/06B01D53/86B01D53/72C02F1/32C02F101/34
Inventor 胡吉明赵继鹏徐俊波
Owner ZHEJIANG UNIV
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