Third, it is said that there is no consumables, just wash the “electrostatic dust collection technology”
Electrostatic dust collection is the adsorption of large particles by the principle of high-voltage electrostatic adsorption. The higher the voltage used, the higher the adsorption efficiency and vice versa. However, high voltages can also cause ozone generation and severe electromagnetic radiation. Developed countries such as Europe and the United States have explicitly banned the use of separate electrostatic dust collection process purifiers in the civilian market.
Advantages: It can remove particulate pollutants such as dust, soot, pollen, etc. in the air, without consumables.
Disadvantages: It is easy to produce ozone and electromagnetic radiation, and it only has effect on large particle gases such as particulate matter. It is mainly used for dust removal, and has little effect on chemical pollution caused by removing formaldehyde, benzene series, TVOC and other decorative decoration. The price is higher, and it needs to be disassembled and cleaned regularly during use, which is time-consuming and labor-intensive.
Fourth, “photocatalyst catalytic decomposition technology” that has ultraviolet light to function.
Visible light or ultraviolet light is irradiated on materials such as titanium dioxide, and light energy is converted into electrochemical energy to release negative ions. Negative ions can decompose formaldehyde in the room. A simple understanding is to decompose harmful formaldehyde into carbon dioxide and water that are harmless to the human body through chemical reactions. Photocatalyst is relatively inefficient and requires a large area to form a certain amount of negative ions. Moreover, a substance such as titanium dioxide as a catalytic substance is itself a kind of pollutant.
Advantages: After spraying the photocatalyst spray, it can release negative ions for a long time.
Disadvantages: Photocatalyst must be exposed to visible or ultraviolet light. If you can’t get the sun’s light and want to activate the photocatalyst, you must add an ultraviolet light to emit ultraviolet light. Therefore, the general photocatalytic purification device is equipped with an ultraviolet lamp (wavelength at 254 nm or 365 nm). The same price is relatively expensive, and the human body should not live in an environment with high doses of ultraviolet rays for a long time. In addition, the purification efficiency of photocatalyst is really low and low.
From the understanding of the above mainstream air purification technology, it is not difficult to find that they have a lot in common:
1. Single function. The purification technology for solid particles is not necessarily effective for gaseous pollutants. Conversely, the effective for gaseous pollutants is not necessarily effective for solid particles, and it is difficult to balance the two;
2, the price is expensive. Whether it is activated carbon, photocatalyst, HEPA or electrostatic dust collection, it is expensive to achieve good results, and other consumables that need to be replaced greatly increase the cost of later use;
3. Secondary pollution. If the consumables are not regularly replaced, secondary pollution may be formed, and electrostatic dust collection is caused by ozone. Excessive concentrations of ozone are harmful to the human body. As for photocatalytic technology, it is inseparable from ultraviolet light, and ultraviolet light is extremely harmful to human skin. These technologies have more or less health risks on the other hand.