Air-purified activated carbon is an internationally recognized high-efficiency adsorption material. It was applied to gas masks as early as the "first world war." Activated carbon is widely used for air purification in automobiles or indoors. Activated carbon is a porous carbonaceous material. Its well-developed pore structure makes it have a large surface area, so it is easy to fully contact with toxic and harmful gases in the air, and the strong adsorption force field around the activated carbon pores will be immediately toxic. Gas molecules are sucked into the pores, so the activated carbon has a strong adsorption capacity and is the main technology for removing gaseous pollutants.
Activated carbon adsorption technology is mainly divided into two categories: physical adsorption and chemical adsorption. Physical adsorption is mainly for macromolecular organic gases (such as benzene and other TVOCs) adsorbing these macromolecular contaminants through the pore structure of activated carbon itself. Chemisorption is mainly targeted at some small-molecule gaseous pollutants such as formaldehyde (hydrogen sulfide, nitrogen oxides, etc.), because the small molecule gas is easily detached again after adsorption to form secondary pollution, so the activated carbon must be chemically treated so that The adsorbed gas reacts with the chemical components to achieve the adsorption effect.