Abstract Activated carbon produced from Okaba coal was modified using potassium hydroxide and phosphoric acid. The effect of this chemical modification was studied using carbon tetrachloride adsorption. Characterization of the activated carbons using scanning electron microscopy and FTIR analysis showed a greater development of porosity obtained by the modified activated carbons and the FTIR spectra displayed bands confirming the presence of hydroxyl, carboxyl and carbonyl functional groups. The predicted influence of chemical modification on activated carbon surface for carbon tetrachloride uptake and adsorption isotherm study from the adsorption models agreed satisfactorily with the experimental values.
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