REMOVAL OF FE (II) ION FROM AQUEOUS SOLUTION BYSORPTION ONTO ACTIVATED ORTHOSIPHON ARISTATUS CARBON(AOAC)Vidhyulatha N., Arivoli S. and Ajithkumar M.Abstract This study deals with preparation and efficient utilization of activated Ortho siphonaristatus stem carbon(AOAC) for the removal of Fe (II) from aqueous solution. Batch experiments were conducted to analyze theeffect of adsorption parameters viz, contact time, adsorbent dose, pH of solution and other ionic concentrationon adsorption process. The results exposed that bivalent iron removal increased slowly but surely up to amaximum of 92.043% and removal gets maximum at 60 minutes. Complete removal of Fe(II) was observedat a dosage of 25 mg/50 ml of pH 6.7 and 60 minutes of contact time. Experimental data were fitted withLangmuir, Freundlich isotherm models and was observed to be better explained by Langmuir adsorptionmodel and the monolayer adsorption was 56.324 mg/g of Fe (II) on AOAC. The kinetic modeling of theprocess of removal was carried out and the process of removal was found to follow a pseudo second ordermodel, Elovich model and intraparticle diffusion model the value of rate constant for adsorption processwas calculated. The thermodynamic parameters such as change in free energy (ïG°), enthalpy (ïH°) andentropy (ïS°) were determined. |