Document Type : Regular Article
Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI, P. O. Box: 11365-3486, Tehran, Iran
Chemical Engineering Department, Babol Noshirvani University of Technology, P. O. Box: 484, Babol 4714871167, Iran
Department of Energy Engineering, Sharif University of Technology, Azadi Ave. Tehran, Iran
The current study was aimed at elucidation of the adsorption properties of Amberlite IRA-68 resin for vanadium ions in aqueous media. We investigated the effect of different parameters such as contact time, pH, initial concentration, temperature and adsorbent dosage on the uptake rate of vanadium. The findings showed that equilibrium data were best fitted by the Freundlich isotherm, and maximum adsorption capacity of the resin was 211.5 mg g-1 at 50 ◦C. The best possible pH for adsorption was 4.5. The first, and second-order reaction models and the Weber–Morris model were applied on the kinetics data. Among them, the best fitting was obtained by the second-order model. The rate controlling step at onset of the uptake was liquid film resistance, which gradually changed to intraparticle diffusion. Thermodynamic study revealed that adsorption was endothermic and spontaneous. The Amberlite IRA-68 resin could preserve more than 95% of its capacity after 8 cycles of adsorption/desorption.