What are the purification methods of the air purifier?air purifier covid

　　The harm of haze to people's lungs and health is well known. People are eager to breathe fresh air, which has led to another round of rise of the air purification market.

　　However, what are the purification methods of the air purifier?

　　It is reported that according to the occurrence principle of air purifier, the traditional purification methods mainly include physical method, electrostatic adsorption method and chemical purification. It is described in detail below!

　　· Adsorptive filtration - activated carbon

　　1. Activated carbon is a porous material containing carbon. It has a highly developed pore structure. The porous structure of activated carbon provides it with a large surface area and can be in full contact with gas (impurities), which endows it with unique adsorption performance and makes it very easy to absorb and collect impurities. Like magnetic force, all molecules have mutual attraction. Such as bamboo charcoal products popular in the market.

　　Disadvantages: ordinary activated carbon can not adsorb all toxic gases, which is inefficient and easy to desorb.

　　2. Mechanical filtration - HEPA filter element

　　HEPA is a filter element that meets the HEPA standard. The effective rate for 0.3 micron is 99.999%. The characteristic of HEPA net is that air can pass through, but small particles cannot pass through. HEPA filter element is composed of a stack of continuous front and back folded sub glass fiber membranes, forming wavy gaskets to place and support the filter interface.

　　Disadvantages: the filter element needs to be cleaned or renewed regularly, which has a certain hidden cost.

　　·Electrostatic purification mode of air purifier

　　Working principle: the tungsten wire of electrostatic precipitator continuously releases high-voltage static electricity, so that the dust and bacteria coming in with the air are positively charged, and then adsorbed by the negative electrode plate. It can filter dust and smoke smaller than cells.

　　Advantages: it is easy to use. After one or two weeks of use, it can wash out dirty water and reduce secondary pollution. It does not need to replace expensive materials and can be electrostatically sterilized. Static tungsten wire releases 6000V high-voltage static electricity and instantly kills bacteria, viruses and pollen. It is extremely effective in eliminating colds and various infectious diseases.

　　Disadvantages: after power failure, the dust adsorbed on the electrode will release and cause secondary pollution, so the electrode plate needs to be cleaned regularly.

　　·Chemical purification mode of air purifier

　　1. Formaldehyde scavenger

　　Working principle: it adopts chemical substances to react with formaldehyde to achieve the purpose of removing formaldehyde.

　　(1) Chemical reaction: chemical reaction with formaldehyde to produce carbon dioxide and water, such as ammonia;

　　(2) Biology: it is made of biological agents that can react with formaldehyde, such as urea, soybean protein, amino acids, etc;

　　(3) Plants: made of plant extracts, such as aloe, tea extract, etc;

　　(4) Closed type: it is made of film-forming materials to form a film to prevent the release of formaldehyde, such as chitosan, liquid paraffin, etc;

　　Disadvantages: first, the substances generated after chemical reaction are likely to bring secondary pollution. In practice, the phenomenon of secondary detection exceeding the standard often occurs. In addition, on the basis of not changing the chemical composition, absorb formaldehyde and reduce the content of formaldehyde in the air. However, in this way, it is easy to release formaldehyde again.

　　2.Pharmaceutical, catalytic method - cold catalyst essence

　　Working principle: cold catalyst, also known as natural catalyst, is another new type of air purification material after photocatalyst deodorization air purification material. It can catalyze reaction at room temperature, decompose a variety of harmful odorous gases into harmless and tasteless substances at room temperature and pressure, change from simple physical adsorption to chemical adsorption, decompose while adsorption, and remove formaldehyde, benzene, xylene Toluene, TVOV and other harmful gases generate water and carbon dioxide. In the catalytic reaction process, the cold catalyst itself does not directly participate in the reaction. After the reaction, the cold catalyst does not change or lose, and plays a role for a long time. The cold catalyst itself is non-toxic, non corrosive and non combustible. The reaction products are water and carbon dioxide, which does not produce secondary pollution and greatly prolongs the service life of the adsorption material.

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