coconut shell active charcoal or active carbon has
wide surface (300-2000 m2/g) (Suhartana., 2006) and has high absorption rate due to having active site that can
absorb organic and inorganic material. According to Rodrigues and Reinoso (1998) active carbon is species with
amphoteric characteristic that can have negative or positive content and depend on solution pH to absorb organic
and inorganic material. Anionic adsorption will occur in low pH and cationic species will prefer high pH. Due to its
usage to absorb heavy metal, it is used as substrate to attach chitosan to absorb heavy metal and organic material
from industrial wastewater more effectively.