With the departure of the last solar-powered frost this fall, it means that China will enter a long winter. Every winter, when China begins to restore heating, an old-fashioned problem – smog, will be placed in front of people again.
In the face of smog, the state has introduced a series of policies to prevent and control, such as promoting environmental protection, energy conservation and emission reduction. However, such prevention and control policies often require a long period of time to practice, and the effect may not be significant in the short term, so for most ordinary people, the use of air purifiers is the most effective prevention and control measures in the short term.
Nowadays, the air purifiers on the market are like a lot of hair, and the principle of air purification is also boasted. So, is there any use of air purifiers? What is the purification principle? What kind of pollutants can each air purifier solve? Down the small series will take you to comprehensive analysis of the common air purification technology on the market.
Is there any use of the air purifier?
The basic principle of the air purifier is to continuously circulate the indoor air, and use some means to filter the pollutants in the air through the filter element, and then discharge the filtered air to circulate and reciprocate to achieve the purpose of resisting pollution and purifying indoor air. purpose.
Currently, there are two types of mainstream air purifiers to purchase. One is to remove solid pollutants represented by haze, and the other is to remove gaseous organic compounds (TVOC) represented by formaldehyde and benzene. At present, the air purifiers on the market can basically meet the daily needs in dealing with these two types of pollutants, but because the technologies used in various purifiers are different, the purification effect is also different.
Air purification technology analysis
1, HEPA filter + activated carbon air purification technology
Advantages of activated carbon air purification technology:
HEPA filter + activated carbon air purification technology is currently the most common air purification technology on the market. There are small holes on the surface of the activated carbon. These holes can adsorb pollutants in the air and have a good effect on removing formaldehyde, ozone, volatile chemical organic compounds (TVOC), carbon dioxide and other pollutants, and then matched with the HEPA filter. The filtering function can quickly achieve the function of filtration and purification in a short period of time.
Defects in activated carbon air purification technology:
However, activated carbon air purification technology also has certain drawbacks. For example, PM2.5, PM10 can suspend particles, carbon monoxide, bacteria and other substances can not be effectively inhaled, and when activated carbon adsorption is saturated, it will no longer adsorb pollutants, or even reverse Release pollutants, causing secondary pollution of household air.
2. Negative ion air purification technology
Advantages of negative ion air purification technology:
Negative ion air purification technology has also been fired in recent years. In fact, negative ion air purification technology is based on the application of negative ion generators, using its negative ions to ion-purify harmful substances such as dust and formaldehyde smoke in the air. Negative ion air purification technology can purify dust, smog, formaldehyde, volatile organic compounds, bacteria and other pollutants in the air.
Negative ion air purification technology defects:
However, in the face of ammonia, ozone, carbon monoxide and other pollutants, negative ion air purification technology can not achieve effective purification effect, and negative ion air purification technology will release ozone when used, ozone will cause intangible damage to the human body to a certain extent, at home If the elderly and children often feel dizzy and headache, it is necessary to check whether the ozone release of the air purifier exceeds the standard.
3. Ozone air purification technology
Advantages of negative ion air purification technology:
Ozone is the umbrella of the earth, and ozone also has a good bactericidal effect. Most of the air purifiers marked on the market today contain ozone generators.
Negative ion air purification technology defects:
Ozone generators will continuously release ozone when used, and excessive ozone will cause human neurotoxicity, dizziness, headache, vision loss and other diseases, which have great hidden dangers.
Most air purifiers release a certain amount of ozone when they are used. However, most air purifiers do not have the function of removing ozone. They are directly discharged into the air and cause harm to the human body. This problem is often easily overlooked. In particular, families with elderly or children at home should pay more attention to the release of ozone from their home air purifiers.
4, NCCO oxygen polymerization air purification technology
Advantages of NCCO air purification technology:
NCCO oxygen polymerization air purification technology is a relatively new hot air purification technology in recent years. It is a new camp for air purification technology. The core technology NCCO reaction layer can directly smog, formaldehyde, bacteria, ozone in the air. Contaminants such as benzene are decomposed into water and carbon dioxide, and the sterilization and deodorization effect is remarkable.
NCCO air purification technology also has a core bright spot—the oxygen polymerization reaction layer does not deplete the material. Generally, an oxygen polymerization reaction layer can be used for more than 12 years, and the cost performance is high.
However, the current Chinese people's perception of this technology is still lacking, so it is not widely used, and there is still much room for development in the future.
5, photocatalyst air purification technology
Photocatalyst air purification technology advantages:
Photocatalyst air purification technology is a metallization represented by titanium dioxide by photocatalytic reaction. Under the illumination of the light source, catalysis occurs, so that the surrounding oxygen and water molecules become active free radicals, and free radicals can remove air. The harmful substances such as bacteria and formaldehyde can achieve the effect of purifying the air.
Photocatalyst air purification technology defects:
However, photocatalyst air purification technology can not remove solid particles such as smog, and the treatment ability in the presence of bacteria and ozone is weak, and the photocatalyst must be activated by ultraviolet light of a specific wavelength. The ultraviolet rays are harmful to humans, and the purification is unpleasant and The machine stays in a room.
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