Abstract
Water hyacinth has been used as a precursor for activated charcoal with H3PO4, KOH and ZnCl2 activators. After the activation process, the activated charcoal samples were treated without calcination and calcination at a temperature of 800 oC for one hour in an Ar gas atmosphere. Each sample of activated charcoal was characterized by N2 absorption at 77 K to determine the specific surface area, specific total pore volume and pore radius formed. From the test results, it was found that the calcination had a very significant effect on the properties of activated charcoal. Calcination of activated charcoal with KOH activator has the greatest effect on the properties of activated charcoal compared to other activators. Activated charcoal with KOH activator which was calcined had a specific surface area of 365.62 m2/g, a specific total pore volume of 0.42 cm3/g and a pore radius of 2.28 nm
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