Activated carbon is a porous carbon material with excellent adsorption properties due to its open pore structure and high specific surface area. Activated carbon adsorption tower is a common technical equipment to deal with pollutants in the air, through the air flowing through the activated carbon bed, so that pollutants on the surface of the activated carbon physical adsorption, chemical adsorption and the surface chemical reaction of the adsorbent itself, to achieve the purpose of purifying the air. This paper mainly introduces the application scenarios and methods of activated carbon adsorption tower in air purification.

1. Application Scenarios

1, home air purifier. At present, air pollution has become the focus of attention, and household air purifiers are gradually popularized. The activated carbon adsorption tower is one of the important components of the home air purifier. Common pollutants in the home are volatile organic compounds, formaldehyde, ammonia, carbon dioxide and other substances. Activated carbon adsorption tower can improve household air quality by absorbing these pollutants.

2, the introduction of fresh air system. In recent years, with the rise of people's environmental awareness, more and more public places have introduced fresh air systems to purify the air. These introduced fresh air systems can also use activated carbon adsorption towers to purify the air, such as hospitals, schools, supermarkets, office buildings and other public places.

3, industrial waste gas treatment. Activated carbon adsorption tower is widely used in the treatment of organic matter in industrial waste gas. Such as: dyes, pigments, coatings, glue, plastic products and other industries, the exhaust gas of these industries is rich in various organic matter, through the treatment of activated carbon adsorption tower, can achieve environmental protection emission standards.

Ii. Methods

The air treatment method of activated carbon adsorption tower is mainly divided into two ways: physical adsorption and chemical adsorption.

1. Physical adsorption

Physical adsorption mainly uses the micropore characteristics of activated carbon itself to adsorb the molecules of pollutants on the surface of the pore. The working principle of physical adsorption is that there is no chemical reaction, only the adsorption caused by several physical effects between the surface of the adsorbent and pollutant molecules. Compared with chemical adsorption, physical adsorption, especially gas adsorption, has a "high temperature yield temperature", that is, when the adsorption temperature rises to a certain extent, the adsorption capacity of the adsorbent gradually decreases until it loses its effect.

2. Chemical adsorption

Chemisorption is for some pollutants, activated carbon itself can not be effectively adsorbed, such as oxidizing pollutants, metal vapor, organophosphorus and so on. The working principle of chemisorption is that there is a chemical reaction, and the molecules or groups on the surface of the adsorbent are recombined, dissociated, REDOX and other chemical reactions to form stable compounds and markers.

In summary, activated carbon adsorption tower has a wide range of application scenarios and methods in purifying air. With the continuous strengthening of people's environmental awareness, activated carbon adsorption towers will be more widely used in the field of air governance, and make greater contributions to improving people's living environment.