Activated carbon: It is porous carbon material and has very strong adsorption capacity resulting from its highly developed porous structure and huge specific surface area. Activated carbon contains oxygen functional groups of multi-elements so as to be impregnated with chemicals to produce impregnated activated carbons. Therefore, it is not only used as an excellent adsorbent, but also as a catalyst or catalyst carrier, of which widely be applied in the areas of Industrial production, agriculture, environmental protection, water purification, decoloration of pharmaceutical intermediates and air purification.