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Adsorption Studies of Fe(III) Ion on Glutaraldehyde Cross-Linked Chitosan and its Application in Purifying Vetiver Oil

Purwantiningsih Sugita, Henny Purwaningsih and Muhammad Fathurrahman

Adsorption of Fe(III) ion by glutaraldehyde cross-linked chitosan (chitosan-GA) has been studied by using batch method. The objectives of this research are to determine the optimum adsorption condition of Fe(III) ion by chitosan-GA, to study the isothermal, kinetics, and effects of Cu(II) ion for adsorption of Fe(III) ion and its application in purifying vetiver oil. The optimum condition is found through response surface Box Behnken method. The adsorption isotherm follows Langmuir and Freundlich models. Percent adsorption value of Fe(III) ion by Chitosan-GA (DD = 78%) is 92% in optimum conditions, i.e.0.75 g adsorbent weight, 25o C, and 360 min contact time. The adsorption process of Fe(III) ion by chitosan-GA fits into Freundlich and pseudo second-order models. The existence of Cu(II) ions is able to decrease the percent adsorption value of Fe(III) ion by chitosan-GA. Percent adsorption of Fe(III) ion by chitosan-GA is higher than that of Cu(II) ion at all conditions. Percent adsorption of Fe(III) and Cu(II) ion by chitosanGA in vetiver oil is lower than other conditions (solution of Fe3+ and Cu2+ ion with its concentration ratio of 1:1).