Surface modification of activated carbon from candlenut shell (Aleurites moluccana) was carried out with HNO3 to adsorb methyl orange dye. The manufacture of activated carbon goes through four stages, namely carbonization at 700 o C, activation with 10% H3PO4, modification with 4N HNO3, and then pyrolysis at 300 o C. Modified carbon was characterized by Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). Various contact times were used to study adsorption kinetics and various concentrations were to study the adsorption isotherm pattern. The optimum time for adsorption of methyl orange dye was 40 minutes and the adsorption kinetic followed pseudo-second-order model. Adsorption isotherm of the activated carbon follows the Langmuir isothermal model with the adsorption capacity value of 17.668 mg.g -1 .
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