Abstract
The series of activated carbon have been prepared by soaking the coffee pulp with phosphoric acid solution and then pyrolysed at 450-500°C. Different concentrations of phosphoric acid were used to evaluate the adsorption capacity : 10 %, 20 %, 30 %, 40 %, and 50 %. The porous of the obtained activated carbon was evaluated by adsorption of methylene blue at room temperature. The concentration of phosphoric acid influences the pore volume of these activated carbons. Soaking the pulp with phosphoric acid solution 30 % give the optimum condition that give the optimum adsorption capacity.
