Application of four-needle zinc oxide whisker in photocatalysis to degrading indoor organic pollutant

A four-needle zinc oxide, organic pollutant technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc.

Inactive Publication Date: 2006-05-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention uses four needle-shaped zinc oxide whiskers as a photocatalyst to degrade various organic pollutants in the room, and there are no relevant literature reports and patent applications

Method used

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  • Application of four-needle zinc oxide whisker in photocatalysis to degrading indoor organic pollutant

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Photocatalytic degradation of acetaldehyde gas using four-needle ZnO whiskers. Weigh 0.4g of self-made four-needle zinc oxide whiskers, add them into deionized water, stir gently, evenly coat on a glass (80mm×80mm in length×width), and dry in an oven at 70°C. Put the glass plate loaded with four-needle zinc oxide whiskers into a photocatalytic reactor with a volume of 500ml, seal it, inject about 3000ppm of acetaldehyde into it from an injection port, and let it stand for 12 hours. With a 300W xenon lamp as a light source, the reaction product was detected with a gas chromatograph GC-14B. After 4 hours of light, the concentration of acetaldehyde has not been measured; after 9 hours of light, 99.1% of acetaldehyde is mineralized into CO 2 . As a comparison, another 0.4g of nano-titanium dioxide (anatase phase: rutile phase is about 80:20, specific surface area 50.1m 2 / g), test under the same conditions, with nano-titanium dioxide as a catalyst, after 3 hours of light...

Embodiment 2

[0021] Formaldehyde gas was photocatalytically degraded by tetrapod ZnO whiskers. Weigh 1g of self-made four-needle-shaped zinc oxide whisker, mix it with water-based paint, spread it on a tile with a length × width of 80mm × 80mm, put it into a photocatalytic reactor with a volume of 500ml after drying, and seal it Inject about 800ppm of formaldehyde from an injection port and leave it for 12 hours. With a 300W xenon lamp as a light source, the reaction product was detected with a gas chromatograph GC-14B. After 2.5 hours of light exposure, no formaldehyde was detected. After calculation, the results show that 98.5% of formaldehyde is mineralized into CO 2 .

[0022] Using tetrapod ZnO whiskers and ZrO 2 , SiO 2 、Al 2 o 3 , CaO, MgO, CaCO 3 , mica, zeolite, activated carbon, lithopone, resin, metal powder, organic particles, coatings, chalk, etc., still have a certain photocatalytic activity, and the degradation efficiency is between 18 and 99.9% (according to the out...

Embodiment 3

[0024] Photocatalytic degradation of toluene gas using tetrapod ZnO whiskers. Select 0.2-30 micron glass fiber filaments and four-needle-shaped zinc oxide whiskers to mix in a weight ratio of 1:0.05-5 (weight ratio), and weave them into glass fiber cloth and glass fiber particulate filter core. Lining glass fiber cloth on the inner wall of a tubular photocatalytic reactor, placing an 18W black light tube in the middle of the tubular photocatalytic reactor, putting glass fiber particle filter elements at both ends, and installing a small blower at one end, In order to blow benzene-containing air into the reactor. Then put the whole tubular photocatalytic reactor into an airtight container, and inject the toluene with a concentration of 10mg / m 3 air. Gas degradation products were determined by Agilent gas chromatography-mass spectrometry (GC / MS-G2589A). After turning on the blower for 20 minutes, start to turn on the black light, and keep timing and sampling. After about 6 ho...

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Abstract

The application of four-needle zinc oxide whisker in photocatalysis to degrade indoor organic pollutant is to use four-needle zinc oxide whisker as photocatalytic material to degrade indoor formaldehyde, acetaldehyde, benzene and its homolog, and total volatile organic compound under the irradiation of ultraviolet ray. The four-needle zinc oxide whisker may be used alone, or through mixing with other material, such as ZrO2, SiO2, Al2O3, TiO2, CaO, MgO, CaCO3, mica, zeolite, active carbon, etc. or as additive added into plastic, ceramic, fiber, timer, rubber, etc to form different photocatalytic product. The present invention has excellent degradation effect.

Description

technical field [0001] The invention relates to the photocatalytic degradation of indoor organic pollutants using four-acicular zinc oxide whiskers as semiconductor materials, and belongs to the technical fields of photocatalytic materials, inorganic materials and environmental protection. Under the irradiation of ultraviolet light, the four needle-shaped zinc oxide whiskers can efficiently degrade various harmful gases in the room, and finally produce substances that are harmless to the human body. Background technique [0002] According to relevant data, more than 60% of human diseases come from air pollution, and air purification plays a very important role in human health. With the improvement of living standards and changes in lifestyles, people spend more and more time indoors, and the quality of indoor air directly affects people's work and life. Poor air quality can distract people and reduce work efficiency. In severe cases, it can als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72B01J23/06B01J35/06
Inventor 李敦钫祝梅邹志刚
Owner NANJING UNIV
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