ACTIVATED CARBON PREPARATION FROM COCONUT LEAVES, FOR IRON(II) ADSORBENT IN SOLUTION

Abstract

Coconut leaves have a high cellulose content of 67.22%, so they have thepotential to be made into activated carbon. Activated carbon is made throughcarbonization at 425 °C for 2 hours and activated with H2SO4 for 24 hours withconcentrations of 0.5 M; 1.0 M and 1.5 M. The addition of H2SO4 in the activationstage caused an increase in the surface area of active charcoal from 10.1707 m2/g to 24.8988 m2/g; 81.5102 m2/g and 113.422 m2/g of active charcoal with H2SO4 concentrations of 0.5 M, 1.0 M, and 1.5 M respectively based on GSA analysis. The resulting activated charcoal was used for the absorption of iron(II) ions in solution, the quality of activated charcoal 1.5 M H2SO4 tested based on SNI No. 06-3730-19195 showed moisture content, ash content and iodine absorption respectively1.2689%, 8.12% and 867.1458 mg/g meet the quality standards of activatedcharcoal. The activated charcoal was used in the adsorption of iron(II) ions in aqueous solution, where the best adsorption conditions were pH 5 and contact time 120 min. Analysis of adsorption isotherms showed that the mechanism of iron(II) ion absorption tends to follow the Langmuir equation rather than Freundlich and BET. Based on the Langmuir equation, the maximum adsorption of iron(II) ions using coconut stick activated charcoal adsorbent was 9.479 mg/g.