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How to choose an air purifier

Publication time:2022/03/30 08:38:31 Reading volume:58 Source: MAHATMA Intelligent Technology Co., Ltd

All kinds of air purifiers on the market make consumers dazzled and charming. How should they choose their own purifiers? Still that sentence, when choosing a purifier, the most important thing is still to look at its principle, which determines other factors such as functions, consumables and so on.

Let's classify the purifiers on the market, so that you can see at a glance that the relatively frequent ones are the following:

1. Electrostatic precipitator

Principle: the pollutants in the air are charged by corona discharge, and the charged particles are captured by dust collection device to achieve the purpose of purifying the air.

Electrostatic precipitator can absorb 0.1 micron dust; No secondary pollution; Minimal wind resistance, low power consumption and noise; It can be recycled, and the later use cost is low.

2. Filter adsorption type

Principle: use porous filter materials, such as non-woven fabric, filter paper, fiber, foam, etc. (HEPA high-density air filter material with the strongest adsorption capacity) to adsorb suspended particles and harmful gases in the air, so as to purify the air; Generally, the treatment method of adsorption filtration is adopted, that is, formaldehyde and other pollutants are sucked into the purifier through the fan and filtered through multiple layers.

The density of filtration adsorption filter paper generally exceeds 30 microns, which has poor purification effect on small suspended particles; The dust accumulated on the filter paper becomes a hotbed for the reproduction of bacteria, resulting in secondary pollution; High noise, high wind resistance of filter paper, and high-power fan is required; Consumables are expensive, need to be replaced and cannot be reused.

3. Photocatalyst type

Principle: photocatalyst is similar to the photosynthesis of chlorophyll in plants. The difference between the two is that chlorophyll absorbs the energy of sunlight and catalyzes the carbon dioxide in the air into oxygen, while titanium dioxide, the main material of photocatalyst, produces hydrogen and oxygen free radicals under ultraviolet irradiation, which can destroy the cell membrane, loss the cytoplasm and cause the death of bacteria. At the same time, formaldehyde, benzene, ammonia and other organic compounds are decomposed into carbon dioxide, water and organic acids harmless to human body. In the whole process, the photocatalyst does not participate in the reaction, but only plays a catalytic role. Therefore, as long as the photocatalyst is not removed, its catalytic role is permanent.

Because the chemical reaction of this type is a continuous process, it takes 7-15 days for the photocatalyst to work in addition to decoration pollution, and there is no dust removal capacity.

4. Negative ion type

Principle: anion air purifier, also known as electrostatic air purifier. It ionizes free electrons from molecules in the air through strong electrostatic field, combines with oxygen molecules in the air to form negative oxygen ions, and combines with bacterial cells in the air to change and die the internal structure of cells. And make toluene, formaldehyde, smoke and dust and other inhaled particles in the air gather and settle naturally, so as to achieve the purpose of purification. The anion air purifier is very quiet when working. Anion is a kind of charged particles, which not only makes the air fresh, but also is very beneficial to human health.

In nature, plant photosynthesis, explosion, lightning and lightning can produce air negative ions. Therefore, people compare the negative ions in the air to "vitamins in the air". Internationally, the first standard index for evaluating air quality is the content of negative ions. According to the latest national medical research, negative ions help protect the respiratory system. Preventing radiation and improving immunity can effectively alleviate the symptoms of dizziness and fatigue caused by "air conditioning disease". At the same time, it can effectively prevent the impact of static electricity emitted by TV and computer on minors' vision.

Negative ion type will wrap the sediment and fall to the ground, which is easy to damage home decoration, furniture and carpets, especially parents with babies at home.


At present, we all know the purification principle used by most air purifiers. What kind of corresponding pollutants can be filtered by the corresponding purification principle?

1. Electrostatic precipitator

Can remove pollutants: dust, bacteria. Basically, due to the particularity of electrostatic dust removal, the pollutants passing through the electrostatic dust removal section will be eliminated, and the sterilization and dust removal rate is very high.

2. Filter adsorption type

Removable pollutants: dust.

3. Photocatalyst type

Chemical and microbial pollutants: chemical pollutants

4. Negative ion type

Removable pollutants: dust and chemical pollutants

Among these types, electrostatic precipitator can play a role in a variety of pollutants, including PM2, which we all pay more attention to at present 5 particles and a variety of pathogenic bacteria. In terms of subsequent consumables, the air purifier based on electrostatic precipitator principle is the most economical and durable because it does not need to replace consumables regularly. It only needs to clean the integrated device on time.

In the past two years, with the increase of purifier categories, air purifiers from single technology to composite technology have appeared in the market, and some integration of the above technologies has been made to strive to achieve total purification. Because the core technology and configuration of each brand are different, we need to analyze its main technical modules and principles, try to refer to the current air situation and choose an air purifier that is really suitable for our own use!


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