Physical purification methods
1. Adsorptive filtration-activated carbon
Activated carbon is a kind of porous carbon-containing material, which has a highly developed pore structure, the porous structure of activated carbon provides a large amount of surface area, which can be in full contact with the gas (impurities), thus giving The porous structure of activated carbon provides it with a large surface area that is in full contact with gases (impurities), thus giving it the characteristic adsorption properties that make it very easy to achieve the purpose of absorbing and collecting impurities. Like magnetism, all molecules have mutual attraction
Disadvantages: ordinary activated carbon does not adsorb all toxic gases, and is less efficient and easy to desorb.
2. Mechanical filtration - HEPA network
HEPA (High efficiency particulate air Filter), the Chinese meaning of high-efficiency air filters, to meet the HEPA standard filters, for the 0.3 micron efficiency of 99.998%. HEPA mesh is characterized by air can pass through, but fine particles can not pass through the HEPA filter by a stack of continuous back and forth folded fiberglass membrane composition, forming a wave-like gasket used to place and support the filter boundary mass.
Electrostatic purification
Principle of operation: the use of high-voltage electrostatic adsorption dust removal principle. Electrostatic type is to use high voltage electrostatic adsorption dust removal working principle. The cathode line in the electrostatic field under the action of high-voltage electrostatic discharge, corona discharge, corona layer produces a large number of negative ions, negative ions in the electrostatic field under the action of the anode, and constantly to the anode movement. When the dust in the air through the electric field, the dust by the collision of negative ions on the charge, with the charge on the dust is also subject to the action of electrostatic field, to the anode (dust collection pole) movement, after reaching the anode to release the charge.
Disadvantages: can remove dust (can not remove toxic gases), lower than mechanical efficiency, slow, and easy to produce ozone, this model was rated by the U.S. market as the worst purifier.
Chemical purification
1 photocatalytic method
Principle of operation: the air through the photocatalytic air purification device, the photocatalyst in the light of their own unchanged, but can promote the chemical reaction of the material in the air of harmful substances such as formaldehyde, benzene, etc. degradation in the photocatalytic effect, the generation of non-toxic and harmless substances, and the air of the bacteria are also ultraviolet light. The air is thus purified.
Disadvantages: broad-spectrum, but the need for air flow rate is low, the purification speed is slow and the human body has a certain degree of radiation, in Europe and the United States is out of the purification method.
2. Formaldehyde scavenger
Principle of work: is the use of chemicals and formaldehyde chemical reaction, to achieve the purpose of removing formaldehyde
1, chemical reaction: chemical reaction with formaldehyde to generate carbon dioxide and water, such as ammonia, etc.;
2, biological: made of biological agents that can react with formaldehyde, such as urea, soy protein, amino acids, etc.;
2, biological: can react with formaldehyde, such as urea, soy protein, amino acids, etc.
3, plant-based: made of plant extracts, such as aloe vera, tea extracts, etc.;
4, closed: made of film-forming substances, the formation of a layer of film to prevent the release of formaldehyde, such as polysaccharide, liquid paraffin, etc.
Drawbacks: a chemical reaction after the generation of substances is likely to bring secondary pollution. Practice often occurs in the process of secondary detection of the phenomenon of exceeding the second is not to change the chemical composition on the basis of absorption of formaldehyde, reduce the formaldehyde content in the air, but this way of treating the symptoms rather than the root cause, formaldehyde is easy to release again.
3. Pharmacy, catalytic method --- cold catalyst essence
Principle of work: cold catalyst, also known as the natural catalyst, is the photocatalyst deodorant air purification materials after another new type of air purification materials, can be catalytic reaction under normal temperature conditions, at room temperature and normal pressure so that a variety of harmful odorous gases decomposed into harmless odorless substances, from simple physical adsorption into chemical adsorption, adsorption and decomposition, remove the formaldehyde content. Adsorption and decomposition, to get rid of formaldehyde, benzene, xylene, toluene, TVOV and other harmful gases, generating water and carbon dioxide, in the catalytic reaction process, the cold catalyst itself is not directly involved in the reaction, after the reaction of the cold catalyst does not change and not lost, long-term role. The cold catalyst itself is non-toxic, non-corrosive, non-combustible, and the reaction product is water and carbon dioxide, which does not produce secondary pollution and greatly extends the service life of the adsorption material.
Other purification methods
1. Water washing method
Using the siphon and centrifugal principle, the purifying agent mixed in water will be sucked into the suction tube under the coaxial centrifugal turbine at the base of the motor through the siphon principle, and then rotate at high speed through the AC shaded-pole motor, and then utilize the centrifugal principle, spraying the purifying agent mixed in water to form a layer of water film inside the bottle gallbladder, and sucking the dust and bacteria into the water. Bacteria into the water, while blowing the purified air into the room, quickly and effectively remove indoor toxin organisms, dust, smoke, odor, viruses, etc., and produce a large amount of fresh oxygen.
2. Negative ion method
Hydroxyl negative ions in contact with harmful gases floating in the air, can restore the pollutants from the atmosphere, nitrogen oxides, cigarettes, etc. generated by reactive oxygen species (oxygen radicals), to reduce the harmful effects of excessive reactive oxygen on the human body; and neutralization of positively charged airborne dust without charge after the deposition, so that the air is purified.