What is the role of chemical filters?
Release time:
2023-01-11
chemical filterWhen in use, it can remove gaseous pollutants in the air. In the field of ventilation and air conditioning, chemical filters use activated carbon as the main filter material. Applications include chip factories, nuclear industry, airports, environmental protection, museums, etc. Chemical filter materials are also used in some household appliances. When you use it, you should know that the chemical filter element selectively adsorbs harmful gas molecules, rather than mechanically removing impurities like ordinary filter elements. Generally speaking, there are a large number of micropores invisible to the naked eye in the activated carbon material, and the total internal surface area of the micropores in the unit material can be as high as 700 to 2300 m2/g. In other words, in the rice grain-sized activated carbon particles, the inner surface of the micropores is equivalent to the size of the wall of a large living room.
Of course, sometimes when the air in the high boiling point (room temperature or above) of free molecules and activated carbon contact, due to the capillary principle, some in the micropores condensed into liquid to stay there, and some are filled with activated carbon micropores. Dimensions. As molecules and separate from them, matter becomes one. At this time, you will find that the boiling point of the main components such as nitrogen, oxygen, carbon dioxide, hydrogen, and argon in the atmosphere is very low, and activated carbon cannot be absorbed. Ordinary activated carbon is a hydrophobic material, so its ability to absorb water vapor is also limited. In addition, chemical filters can also suck some microorganisms in the air and kill them. Therefore, the adsorption that can chemically react with harmful gases by chemical treatment is called chemical adsorption. Chemical filters rely on van der Waals forces to grab gas molecules, and the chemical composition of the material reacts with pollutants to produce solid compounds or harmless gases. The main method of chemical treatment is to uniformly mix a specific reagent, so the chemically treated activated carbon is also called "impregnated carbon". The ability of chemical filters, especially during use, will continue to weaken. When it is weakened to a certain extent, the filter element will be scrapped. If it is only physical adsorption, the harmful gas can be separated from the activated carbon by heating or steam fumigation to regenerate the activated carbon.
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What is the role of chemical filters?
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