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Rubber seed shell (Hevea brasiliensis) is a by-product of the rubber plant. Rubber seed shells contain high cellulose, lignin and pentosan compounds so that they can be used as adsorbents. In this study, rubber seed shells were carbonized at 500oC for 15 minutes and activated with KOH at various concentrations (5; 10; 15%). The rubber seed shell activated charcoal produced was characterized…