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Method for forming heteronitrogen nano TiO2 light catalytic activity coating on substrate

A nano-titanium dioxide, activator technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of non-photocatalytic materials, secondary pollution, and susceptible to photocorrosion environment, etc. High photocatalytic activity, firm material coating, simple and convenient method

Inactive Publication Date: 2004-04-28
INST OF CHEM CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Narrow bandgap semiconductor materials, although they can be excited by visible light, are prone to photocorrosion and may cause secondary pollution to the environment, so they are not ideal photocatalytic materials

Method used

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  • Method for forming heteronitrogen nano TiO2 light catalytic activity coating on substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First polish the side of the metal aluminum plate to be coated, then heat it to 500°C, keep the temperature for 3 hours, and use plasma spraying equipment to spray anatase phase nano-titanium dioxide powder with an average particle size of 52.0nm on the polished side , while doping with nitrogen, the doping ratio is about 1wt% (N / TiO 2 wt%). Among them, the spray gun is an internal powder-feeding spray gun, and the discharge form is DC discharge. The working gas used in spraying is a mixed gas of ammonia and argon, and the gas volume ratio is NH 3 / Ar=2:1, the pressure of the working gas is 0.5Mpa, the total gas flow is 40.0M 3 / h. Other parameters are: the power is 27.5kW, the powder feeding flow rate is 60g / min, the spray distance is 200mm, and the coating thickness is controlled at about 1.0μm. After spraying, keep the aluminum plate at a constant temperature of 300° C. for 2 hours, and cool it down to room temperature naturally to obtain a nitrogen-titanium diox...

Embodiment 2

[0035] Clean the glass sheet first, then heat it to 200°C, keep the temperature for 4 hours, use plasma spraying equipment to spray rutile phase nano-titanium dioxide powder with an average particle size of 80.0nm on the clean surface, and do nitrogen doping at the same time , the doping ratio is about 8wt% (N / TiO 2 wt%). Among them, the spray gun is an internal powder-feeding spray gun, and the discharge form is DC discharge. The working gas used in spraying is a mixed gas of ammonia and argon, and the gas volume ratio is NH 3 / Ar=1.5:1, the pressure of the working gas is 0.5Mpa, the total gas flow is 40.0M 3 / h. The powder feeding gas is argon. Other parameters are: spray distance 250mm, powder feeding flow rate 50g / min, power 25.0kW, control coating thickness about 0.8μm. After spraying, the glass sheet was kept at a temperature of 300°C for 3 hours, and then naturally cooled to room temperature. A coating coated with nitrogen nano-titanium dioxide can be obtained on ...

Embodiment 3

[0037] Clean the porous ceramic plate first, then heat it to 400° C., and after constant temperature for 2 hours, use plasma spraying equipment to spray it with anatase phase and rutile phase nano-titanium dioxide powder with an average particle size of 62.0 nm ( A / R=3 / 7), nitrogen doping is performed at the same time. The doping ratio is about 15wt% (N / TiO 2 wt%). Nitrogen (N 2 ) and argon (Ar) is the working gas, and the volume ratio of nitrogen to argon in the mixed gas is N 2 / Ar=1:1, the pressure of the working gas is 0.7Mpa, the total gas flow is 45.0M 3 / h, using argon as the powder feeding gas. Other parameters are: spray distance 200mm, powder feeding flow rate 30g / min, power 40.5kW, control coating thickness at about 1.0μm. After spraying, the porous ceramic plate was kept at a temperature of 400° C. for 2 hours, and then naturally cooled to room temperature. Under the operating frequency of the ultrasonic instrument at 20 Hz, the porous ceramic plate loaded wi...

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Abstract

The present invention belongs to the field of painting technology, and is especially the process of forming nitrogen doped photocatalytic TiO2 coating on sustrate. The process includes the following steps: adopting N2, Ar, Kr or their mixture as powder feeding gas; and NH3 / Ar mixture or N2 / Ar mixture as work gas; cleaning and / or polishing metal plate or other substrate, preheating at 200-600 deg.c, spraying nano TiO2 powder to the substrate surface with a plasma spray equipment while doping N element to form the N doped TiO2 film on the substrate surface; and sintering at 500-600 deg.c to cure the N doped TiO2 film completely and to form the N doped TiO2 coating.

Description

technical field [0001] The invention belongs to the field of coating, and in particular relates to a method for forming a nitrogen nano-titanium dioxide photocatalytic active agent coating on a base material by using a plasma spraying technology. Background technique [0002] With the rapid development of modern industry and the continuous improvement of people's living standards, the problem of environmental pollution has become increasingly serious. Governments of various countries have listed environmental pollution control as an important task, and have invested huge sums of money in the research and development of environmental materials and environmental control technologies. . In 1976, J.H.Cary and others reported that under the irradiation of ultraviolet light, TiO with photocatalytic oxidation effect 2 It can dechlorinate the refractory organic compound chlorinated biphenyls. Photocatalytic degradation technology has gradually attracted wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/02C23C4/11C23C4/134
Inventor 杨青林江雷
Owner INST OF CHEM CHINESE ACAD OF SCI
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