Removal of Fe(II) ions from aqueous solution by Calabrian pine bark wastes

The ability of Calabrian pine bark wastes (Pinus brutia Ten) for the removal of Fe(II) ions from aqueous solution at different concentrations and temperatures at a fixed pH was investigated. While the amounts of Fe(II) ions adsorbed onto the bark increased with increasing concentration, it increased slightly with increasing the temperature. Kinetics studies showed that adsorption process followed the first-order kinetic model as well as intra-particle diffusion kinetics. Adsorption isotherm followed both Langmuir and Freundlich models. And it was deter-mined that the adsorption was favorable from a dimensionless factor, R-L. Furthermore, the thermodynamic parameters demonstrated that the removal of Fe(II) by the bark was a physical process. (C) 2003 Elsevier Ltd. All rights reserved.