Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

Abstract: In this study removal of Fe(II) by chitosan adsorbent was experimentally investigated in a batch system. The adsorbent dose and pH of the metal solution was fixed at 0.15 g and 4, respectively. Adsorption experiments were carried out at initial concentration range of 10–50 mg lG at 20°C. Equilibrium studies showed1 that experimental data were well fitted to Langmuir–Freundlich isotherm model. Linear and non-linear forms of pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic adsorption processes. The model parameters were confidently recovered. The kinetics followed the non-linear form of pseudo-first-order model which represents adsorption of Fe(II) on chitosan takes place through a physical process. The examination of kinetic data also revealed that the adsorption rate was dominated by intra-particle diffusion mechanism. Key words: Chitosan % Intraparticle diffusion % Iron removal % Isotherm models % Pseudo-first-order % Pseudo-second-order INTRODUCTION type or traditional adsorbents have been tested in Contamination of water by heavy metal is rapidly an effective natural macromolecule adsorbent [13]. It has increasing in recent years due to extensive industrial a great tendency to eliminat metal ions due to large and agricultural activities. Besides due to the pollution number of carboxylic and amino groups in its structur