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A kind of preparation method of nano titanium dioxide photocatalytic coating

A nano-titanium dioxide, photocatalytic technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing the photocatalytic activity of photocatalytic coatings and affecting coatings Comprehensive performance and application, catalytic coating is easy to fall off, etc., to achieve good photocatalytic degradation of organic matter performance, good application value and market prospects, and good photocatalytic performance.

Active Publication Date: 2021-01-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the use of nano-powder to disperse into a suspension, the combination of the secondary particles loaded on the matrix at high temperature and the matrix material is very loose, the catalytic coating is easy to fall off, and its practical application is difficult; the current solution mostly adopts the introduction of binder materials Increase the bonding strength between the coating and the substrate, but the coating effect of ordinary adhesives on nano-catalysts will reduce the photocatalytic activity of the photocatalytic coating (CN101264455A), affecting the overall performance and application of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Substrate surface cleaning: take carbon steel sheet as the substrate, after cleaning with acetone, alcohol and deionized water in sequence, blow dry with nitrogen gas for later use;

[0030] (2) Roughening of the surface of the substrate: The surface of the cleaned substrate is roughened by sandblasting to increase the surface roughness of the substrate and improve the bonding strength of the coating. The process parameters adopted are air pressure 1.0MPa, sandblasting time 30 seconds, and the number of sand shot used for sandblasting is 100 mesh;

[0031] (3) Construction of nano titanium dioxide coating on the surface of the substrate: a mixed solvent of 50% ethanol-water is used to prepare a raw material suspension of 10% titanium dioxide P25 powder and 3% aluminum powder by mass percentage, and the particle sizes of titanium dioxide powder and aluminum powder are respectively are ~25nm and 50nm. The nano-titanium dioxide coating was constructed on the surface o...

Embodiment 2

[0033] (1) Substrate surface cleaning: take polyethylene sheet as the substrate, wash it with acetone, alcohol and deionized water successively, and dry it with nitrogen gas for later use;

[0034] (2) Roughening of the surface of the substrate: The surface of the cleaned substrate is roughened by sandblasting to increase the surface roughness of the substrate and improve the bonding strength of the coating. The process parameters adopted are air pressure 1.0MPa, sandblasting time 10 seconds, and the number of sand shot used for sandblasting is 200 mesh;

[0035] (3) Construction of nano-titanium dioxide coating on the surface of the substrate: a mixed solvent of 50% ethanol-water is used to prepare a raw material suspension of 10% nano-titanium dioxide P25 powder and 5% zinc powder by mass percentage, and the nano-titanium dioxide particle size is ~ 25nm ; Zinc powder particle size is 100nm. The nano-titanium dioxide coating was constructed on the surface of the substrate by...

Embodiment 3

[0037] (1) Substrate surface cleaning: use alumina ceramic sheet as substrate, after cleaning with acetone, alcohol and deionized water successively, blow dry with nitrogen gas for later use;

[0038] (2) Roughening of the surface of the substrate: The surface of the cleaned substrate is roughened by sandblasting to increase the surface roughness of the substrate and improve the bonding strength of the coating. The process parameters adopted are air pressure 1.0MPa, sandblasting time 10 seconds, and the number of sand shot used for sandblasting is 200 mesh;

[0039] (3) Nano-titanium dioxide coating construction on the surface of the substrate: using a mixed solvent of 50% ethanol-water, the preparation mass percentage is 5% nano-titanium dioxide P25 powder, 2% aluminum powder raw material suspension, the particle size of titanium dioxide is ~ 25nm, aluminum The particle size of the powder is 50nm. The nano-titanium dioxide coating was constructed on the surface of the substrat...

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Abstract

The invention discloses a method for preparing a new type of nanometer titanium dioxide photocatalytic coating, which includes: spraying a pre-prepared suspension containing metal powder and nanometer titanium dioxide powder as a spray raw material on a pretreated substrate using a flame thermal spraying method, A nanometer titanium dioxide photocatalytic coating is obtained, in which the solid-liquid mass ratio of the suspension is 1 to 50:100; the mass ratio of the nanometer titanium dioxide powder to the metal powder is 1 to 10:1. The preparation method of the present invention has the advantages of simple operation, few technological processes, low cost, etc., and is suitable for industrial production. The thickness of the photocatalytic coating of nanometer titanium dioxide obtained by the preparation method of the present invention is 5 to 100um. It has good photocatalytic performance, especially good photocatalytic degradation of organic matter, and has high bonding strength with the substrate and strong coating stability. In the field of photocatalytic degradation of organic pollutants, it has good application value and market prospects.

Description

technical field [0001] The invention belongs to the field of photocatalytic coating preparation, and in particular relates to a preparation method of a nano-titanium dioxide photocatalytic coating using metal powder as a binder. Background technique [0002] 70% of the earth's surface area is covered by water bodies, but 97.47% of them are salt water, which cannot be used for people's daily life and industrial production. People can only rely on groundwater above 800m, rivers, lakes and water vapor, and the total amount of this part of water is less than 3% of the total water on the earth, and the limited fresh water resources are often wasted or polluted, making water resources increasingly tense. [0003] At present, commonly used sewage chemical treatment technologies include flocculation and sedimentation technology (corrosion inhibitors, scale inhibitors, bactericides, flocculants), oxidation technologies (supercritical water oxidation, photocatalytic oxidation, ultraso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J21/06C02F1/30C02F101/30
CPCC02F1/30B01J21/063B01J23/06B01J37/0217B01J37/0225C02F2101/308C02F2305/10B01J35/39
Inventor 张波涛龚永锋黄晶陈秀勇周平所新坤李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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