Activated carbon adsorption principle: one's own unique structure of activated carbon is a major gap carbonaceous material by the appearance of black, internal voids structure developed, large surface area, strong adsorption capacity of a class of microcrystalline carbon materials. There are a lot of carbon materials invisible pores, 1 g of activated carbon microporous material, after the commencement of its surface area of ??up to 800-3000 meters, special purpose higher. That is, in a grain size of the carbon particles, porous internal surface area may be equivalent to the size of a living room area. It is these highly developed, such as human capillary-like pore structure of activated carbon have excellent adsorption performance. Interaction between two molecules is also called "van der Waals attraction." Although the molecular movement speed is affected by the temperature and material of other reasons, it is always in a constant micro-environment movement. As has mutual attraction between molecules force, when a molecule is activated to capture into the hole inside the pores of activated carbon, it will lead to more molecules continue to be attracted to carbon within the pores until they fill up. 3 Activated carbon adsorption of harmful substances in mass number? Different materials and use of activated carbon, the inner diameter size is not the same. In general, high-quality coconut shell activated carbon adsorption of harmful substances quality can be close to or even reach its own quality. 4 activated carbon adsorption properties of activated carbon as hazardous substances physical adsorption principle, the role of the process, relying on the air as a medium, so it is defined as passive air purification materials.