Test Method for Activated Carbon|SGS
Activated carbons are non-hazardous, processed, carbonaceous productsharving a porous structure and a large internal surlace area, These materialscan adsorb a wide variety o substances,ie.thev are able to attracmolecules to their internal surtace, and are therefore called adsorbenis.
The volume of pores of the activated carbons is generally greater than0.2 mlg', The internal surface area is generally greater than 400 m*g-. Thewidth of the pores ranges from 0.3 to several thousand nanometers.
Types of Activated Carbon
There are three different types of activated carbon. Based on the
application a specific type of activated carbon is used:
Activated Carbon Testing Methods
To measure the effectiveness of the AC based on its application
the following chemical test methods are adopted.
Iodine number-Water and liquid adsorption
Methylene blue number Phenol number
Benzene adsorption Dye adsorption
Water treatment (drinking water)
Carbon tetrachloride activity
Gas phase adsorption
Tests methods such as Iodine Number, Methylene Blue Number and Phenol Number are generally carried out to characterize the AC used for the purpose of liquid phase adsorption. The Benzene adsorption test gives the indication of the pore structure of the activated carbon. However the use of Benzene is strongly discouraged because of the inherent cancer risk. The pore volume of the AC is determined by CTC activity. It is also used for quality control and grading of granular activated carbon.