Activated carbon is a porous structure, it has relatively large specific surface area of its BET and surface functional groups. With this feature, some contaminants have strong absorption in the liquid and gas. Compare with others, the price is more competitive, therefore, it plays an extremely important role.

There are common types of activated carbon:Coconut shell charcoal, coal ,charcoal. Used in different areas, the use of carbon materials will be different.

The performance of activated carbon is decided on its specific surface area (BET) m2 / g. (Each gram of activated carbon per pore size ).Greater value of BET means pore size of activated carton is more larger, the material also can be adsorbed more.