Activated carbon air purifier is a. Is a high quality activated carbon with a special treatment for special purification of contaminated air, so called air purifiers charcoal. Only the hardness, strength, porosity of activated carbon is microporous carbon can be used as air purification. Shell charcoal, coal, charcoal air purifier can be done, of which the best shell charcoal, for the following reasons: not all of the activated carbon air purifier can be done. 
 Air purification by activated carbon pore size of the aperture can be divided into three categories. 
 Large hole: radius of 100 - 2000 nm. 
 Transition pore: radius of 2-100nm. 
 Pore: radius of 2nm or less. 
 Activated carbon made from different materials with different pore sizes. 
 System activated by the shell has the smallest pore radius, so rich in small pores of small molecules most suitable for purification of gases. Because clean air requirements and its specific surface area, pore size slightly larger than the adsorbed gas molecules in size. 
 Wood activated carbon generally have the largest pore radius, they are used to adsorb larger molecules, and almost exclusively in the liquid phase. 
 Coal activated carbon pore size in between. The transition of activated carbon from coal with more and larger average pore diameter, so the water can be removed and organic macromolecules. 
 Generally used in water treatment activated carbon, its surface area is not necessarily too large, but the transition should have more and larger average pore diameter.