The mainstream filter material for air purifiers

At present, the mainstream categories of air purifier filter elements on the market are as follows: HEPA (high efficiency) filtration, photocatalyst, activated carbon, negative ion generator and other materials, the most common filter element material is generally activated carbon, photocatalyst, etc., a slightly high-end filter element will use HEPA (high efficiency) filtration, negative ion generator, etc., the following will roughly talk about the role and brief introduction of these filter element materials.

1. HEPA (high efficiency) filtration, it can be said that it is the most common filtration material for mainstream air purifiers on the market. It refers to the filter screen that meets the HEPA standard, with an effective rate of 99.7% for 0.1 microns (1 micron = 0.0001 cm) and 0.3 microns, and it can remove more than 99.97% of particulate matter with a diameter of 0.3 microns (1/200 of the diameter of a hair), which is the most effective filter medium for air pollutants such as smoke, dust, and bacteria. The HEPA filter element is characterized by large wind resistance, large dust holding capacity, and high filtration accuracy, which can be processed into various sizes and shapes according to customer needs, and can be suitable for different air purifier models.

2. Photocatalyst, also known as photocatalyst, is a general term for semiconductor materials with photocatalytic function represented by nanoscale titanium dioxide. A common photocatalyst material is titanium dioxide, which can produce strong oxidizing substances (such as hydroxyl radicals, oxygen, etc.) under light irradiation, and can be used to decompose organic compounds, some inorganic compounds, bacteria and viruses. In daily life, photocatalysts can effectively degrade toxic and harmful gases in the air, such as formaldehyde. At the same time, it can effectively kill a variety of bacteria, and can decompose and harmlessly treat the toxins released by bacteria or fungi.

3. Activated carbon, which is a specially treated carbon, heats organic raw materials, such as shells, coal, wood, etc. under air-isolated conditions to reduce non-carbon components (carbonization), and then reacts with gas, the surface is eroded, resulting in a microporous structure (activation). Because the activation process is a microscopic process, that is, the surface erosion of a large number of molecular carbides is punctate erosion, resulting in countless fine pores on the surface of activated carbon. The adsorption capacity of activated carbon is related to the pore size and structure of activated carbon. Generally speaking, the smaller the particles, the faster the pore diffusion rate, and the stronger the adsorption capacity of activated carbon. Only activated carbon with high hardness, high strength, and microporous pores can be used as air purification activated carbon.

4. Negative ion generator, it is a device that generates air negative ions, the device will input DC or AC through the EMI processing circuit and lightning protection circuit after processing, through the pulse circuit, overvoltage current limiting; The high and low voltage isolation lines are upgraded to AC high voltage, and then the pure DC negative high voltage is obtained after rectification and filtering through special grades of electronic materials, and the DC negative high voltage is connected to the release tip made of metal or carbon elements, and the tip DC high voltage is used to generate high corona and release a large number of electrons at high speed, and the electrons cannot exist in the air for a long time, and will be immediately captured by oxygen molecules in the air, thus generating air negative ions. Large particle size anion has the functions of dust removal, fresh air, smoke elimination, etc.

The above 4 filter elements are the mainstream filter elements of air purifiers on the market, and I hope that the above introduction can help you increase your understanding of air purifiers.