Study of Fe (III) impregnated chitosan as adsorbent of carmine dyes

One method to reduce carmine dyes concentration in aqueous solution is adsorption using chitosan. Impregnation of Fe(III) onto chitosan could enrich the surface textures and enhance the active sites of adsorbent. The aims of this research were to investigate the effect of impregnated Fe(III) ion onto chitosan toward carmine dyes adsorption, to determine the characteristic of carmine dyes adsorption including pH, agitation time, and to determine the adsorption capacity of the adsorbent. The amount of adsorbed carmine dye in aqueous phase was measured based on the different between concentration before and after adsorption process using UV-Vis spectroscopy. Determination of the optimum condition was conducted on 10ppm carmine dyes, 125rpm and 0.5g adsorbent. The result shows that concentrations of Fe(III) ion impregnated onto chitosan influence the adsorption of carmine dyes, with the optimum Fe(III) concentration of 15ppm. In overall, the optimum conditions were reached at pH of 8, aging time of 4 hours with adsorption capacity of 0.116 mg/g.