Kinetics and thermodynamics of aluminum oxide nanopowder as adsorbent for Fe (III) from aqueous solution

Batch adsorption of Fe (III) from aqueous solution by aluminum oxide nanopowder was studied in batch system. The removal efficiency (99.9%) was obtained at pH 4 and 50 min contact time. The results indicate that the process follows Langmuir isotherm and pseudo-second-order kinetics model. As well as the thermodynamic data indicated that the exothermic nature process. The values of enthalpy (ΔH°), mean free energy (E) and activation energy (Ea) indicate that the adsorption process is physical sorption.