Air purifiers are small household appliances used to purify indoor air. They mainly solve indoor air pollution problems caused by decoration or other reasons. Since the release of pollutants in indoor air is characterized by persistence and uncertainty, the use of air purifiers to purify indoor air is an internationally recognized method for improving indoor air quality.
There are many different technologies and media in an air purifier that allow it to provide clean and safe air to its users. Commonly used air purification technologies include: low-temperature asymmetric plasma air purification technology, adsorption technology, negative ion technology, negative oxygen ion technology, molecular complexation technology, photocatalyst technology, TIO2 technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, active oxygen Technology, etc.; material technology mainly includes: photocatalyst, activated carbon, synthetic fiber, HEAP high-efficiency material, negative ion generator, etc. Most of the existing air purifiers in the domestic market are composite types, which use a variety of purification technologies and material media at the same time. 1) Electrostatic dust removal: It can filter dust, smoke and bacteria smaller than cells to prevent lung disease, lung cancer, liver cancer and other diseases.
The most harmful thing to the human body in the air is dust smaller than 2.5 microns, because it can penetrate cells and enter the blood.
Ordinary purifiers use filter paper to filter dust in the air, which can easily block the filter holes. As more dust accumulates, it not only has no sterilization effect, but also easily causes secondary pollution.
2) Electrostatic sterilization: The electrostatic tungsten wire releases 6,000 volts of high-voltage static electricity, which can instantly and completely kill bacteria and viruses attached to dust and prevent colds, infectious diseases and other diseases. Its sterilization mechanism is to destroy the four polypeptide chains of the bacterial capsid protein and damage the RNA. HEPA is the abbreviation of High Efficiency Particulate Air Filter. The HEPA filter is composed of a stack of sub-glass fiber membranes that are continuously folded back and forth to form a wavy gasket to place and support the filter medium.
HEPA is an internationally recognized best high-efficiency filter material. Initially, HEPA was used for nuclear energy research protection, and is widely used in precision laboratories, pharmaceutical production, atomic research, and surgeries that require high cleanliness. place. HEPA is made of very fine organic fibers intertwined, with strong ability to capture particles, small pore size, large adsorption capacity, high purification efficiency, and water absorption. The purification rate for particles of 0.3 microns is 99.97. In other words: for every 10,000 particles, only 3 particles can penetrate the HEPA filter membrane. Therefore, its effect of filtering particulate matter is very obvious! If you use it to filter cigarettes, the filtration effect can reach almost 100%, because the size of particles in cigarettes is between 0.5-2 microns and cannot pass through the HEPA filter membrane.
The filtration efficiency of a HEPA high-efficiency particulate filter is directly proportional to its surface area. The HEPA high-efficiency particulate filter of the air purifier is folded in multiple layers. The area after unfolding is approximately 14.5 times larger than when folded, and the filtration efficiency is very outstanding. Negative ions are a type of negatively charged gas ions in the air. Most of the free electrons generated by the ionization of air molecules under the action of high pressure or strong rays are obtained by oxygen. Therefore, negative air ions are often collectively referred to as "negative oxygen ions". . The molecular formula of negative ions is O2-(H2O)n, or OH-(H2O)n, or CO4-(H2O)n. The environmentally friendly air negative ions mentioned here mainly refer to the first two small molecule negative ions.
Negative ions have the functions of sedation, hypnosis, analgesia, antitussive, antipruritic, diuretic, appetite increasing, and lowering blood pressure. After a thunderstorm, people feel relaxed because the negative ions in the air increase.
Air negative ions can reduce reactive oxygen species (oxygen free radicals) generated from atmospheric pollutants, nitrogen oxides, cigarettes, etc., reduce the harm of excessive reactive oxygen species to the human body; neutralize positively charged air The floating dust settles after having no charge, so that the air can be purified.
However, the life of negative oxygen ions is very short, and unclean air will further reduce its concentration, making it ineffective in dealing with pollutants.
Activated carbon is a very small carbon particle with a large surface area, rich micropores, and strong adsorption capacity. Because the carbon particle has a large surface area, it can fully contact with gas (impurities). When these gases (impurities) are adsorbed by the micropores, they play a purifying role.
However, activated carbon can only temporarily adsorb certain pollutants. When the temperature and wind speed rise to a certain level, the adsorbed pollutants may be released and enter the breathing space again, causing secondary pollution. Therefore, filter materials should be replaced frequently to avoid adsorption saturation.
The activated carbon in the odor filter is made from specially treated coconut shells and is pressed into a cylinder shape. This allows the activated carbon to be exposed to as many odors and chemicals as possible without impeding air circulation. Pollutants have successfully improved the essence of Yixin air purifier. The activated carbon in the odor filter has a large adsorption area and superior filtration ability. According to relevant research, the adsorption area of ??activated carbon weighing 1 gram can reach 500-1500 square meters. Photo catalyst, also known as light catalyst, is a type of semiconductor material represented by titanium dioxide (TiO2). It does not change itself under the irradiation of light, but can promote chemical reactions and has a catalytic function. General term. Under the irradiation of a light source, it can use the energy of a specific wavelength light source to produce a catalytic effect (redox reaction), exciting the surrounding oxygen and water molecules into active free ion radicals such as OH^- and O^2-. These free radicals It can decompose almost all organic substances and some inorganic substances that are harmful to the human body or the environment. Photocatalysts must be exposed to ultraviolet rays to function. If sunlight is not available, if you want to activate the photocatalyst, you must add an additional UV lamp. The choice of UV lamp should be 254nm or 365nm, which is more effective. As for the conditions of weak light sources such as natural light and fluorescent lamps or even no light, the photocatalyst cannot function normally. The so-called "cold catalyst" that functions under lightless conditions has lost the true meaning of "photocatalyst". But too much ultraviolet rays are harmful to the human body.
Photocatalyst technology actually relies on ultraviolet irradiation of titanium oxide ions on the photocatalyst network to activate and oxidize bacteria that come into contact with its surface. High-end bioengineering technology from Europe, based on the principle of certain plants absorbing formaldehyde, extracts essence from dozens of natural plants, adds active ingredients and refines it through a special process; this product is a water-based liquid, colorless, tasteless and odorless. It is non-volatile (except moisture) and can actively capture free formaldehyde and form a stable solid substance. Once used, the effect is rapid and long-lasting.
However, formaldehyde scavengers can only temporarily seal the source of pollution and prevent formaldehyde from evaporating in a short period of time, but cannot completely remove formaldehyde pollution. Because formaldehyde pollution is persistent, usually lasting 10 to 15 years, if the product claims to be eradicated at once or completely, it is basically impossible unless the formaldehyde has evaporated by itself. Some spray-type formaldehyde removers are very convenient to use. Although they temporarily eliminate the odor in the air, they only form a protective film on the outer layer of the pollution source. The source of formaldehyde volatilization is not solved. After this protective film fails, formaldehyde remains. It will be released in large quantities to pollute the indoor air; some formaldehyde scavengers claim to be able to chemically react with formaldehyde, but if the formaldehyde scavenger reacts incompletely with formaldehyde, other toxic substances may be generated and cause secondary pollution. The thick layer of gaseous ozone is bluish and has a special odor, which smells similar to chlorine when the concentration is high; liquid ozone is dark blue and solid ozone is purple-black.
The inactivation reaction of bacteria by ozone always proceeds very quickly. The first effect of ozone on viruses is the four polypeptide chains of the virus's capsid protein, and damages the RNA, especially the protein that forms it. After the phage is oxidized by ozone, electron microscopy observation shows that its epidermis is broken into many fragments, from which a lot of ribonucleic acid is released, interfering with its adsorption to the host. The thoroughness of ozone sterilization is beyond doubt.
Due to reasons such as vehicle exhaust emissions not meeting standards, the concentration of ozone in the environment is close to 0.02ppm. The reason why it cannot be smelled is because the air pollution is too serious.
Excessive ozone is seriously harmful to human health. It strongly stimulates the human respiratory tract, causing sore throat, chest tightness and coughing, bronchitis and emphysema; it can cause neurotoxicity, dizziness and headaches, decreased vision, and memory loss; it can cause It has a destructive effect on vitamin E in human skin, causing wrinkles and dark spots on human skin. Ozone can also destroy the human body's immune function, induce chromosomal lesions in lymphocytes, accelerate aging, and cause pregnant women to give birth to deformed babies. When choosing a purifier that uses ozone sterilization, you must strictly pay attention to whether the ozone production rate meets national standards. Ultraviolet rays are a general term for radiation with wavelengths from 0.01 to 0.40 microns in the electromagnetic spectrum and cannot cause human vision. Radiation with a wavelength of 0.01~0.04 microns in the electromagnetic spectrum, ranging from the visible violet end to X-rays.
Ultraviolet rays are divided according to wavelength: near ultraviolet UVA, far ultraviolet UVB and ultra-short ultraviolet UVC. The degree of penetration of ultraviolet rays into human skin is different. The shorter the wavelength of ultraviolet rays, the more harmful it is to human skin. Short-wave UV rays can pass through the dermis, while medium-wave UV rays can enter the dermis.
Ultraviolet light with a wavelength of 200 to 290nm can penetrate the cell membranes of bacteria and viruses, damage nucleic acids (DNA), cause cells to lose their ability to reproduce, and achieve rapid sterilization effects. Short-wavelength ultraviolet light with a wavelength below 200nm can decompose O2 molecules, and the generated O* combines with O2 to produce ozone O3. Ultraviolet rays and ozone have a strong ability to oxidatively decompose organic molecules including odors. The synergistic effect of UV/O3 combination exerts powerful power in air purification treatment.
When ultraviolet rays act strongly on the skin, photodermatitis can occur, with erythema, itching, blisters, edema, etc. appearing on the skin; in severe cases, it can also cause skin cancer.
Ultraviolet rays act on the central nervous system, causing headaches, dizziness, and increased body temperature. Acting on the eyes, it can cause conjunctivitis and keratitis, called photoophthalmia, and may also induce cataracts. The ultraviolet rays generated during the welding process can cause welders to suffer from electro-optical ophthalmia (which can be cured). Plasma ion cluster, namely Plasma ion cluster space purification technology, abbreviated as: PCI. It is Sharp's patented technology. Through the high-voltage discharge of the net ion generator, the positive and negative ions that are the same as those in nature are released to surround and decompose harmful substances such as floating molds and viruses in the air to achieve the effect of purifying the air.
Plasma ion cluster space purification technology was developed by Sharp in 2000. It is an airborne sterilization technology independently developed by Sharp. It can inhibit floating viruses, decompose and remove floating mold