Akademik Veri Yönetim Sistemi
FRESENIUS ENVIRONMENTAL BULLETIN, cilt.21, ss.2459-2465, 2012 (SCI-Expanded)
The present work was undertaken to explore the effectiveness of using magnesite tailing for the removal of zinc ions from aqueous solution. The effects of pH, contact time, sorbent dosage, initial concentration and temperature on zinc ions sorption were studied. The pseudo first order, the pseudo second order and the intraparticle diffusion models were used to evaluate the sorption kinetics. The experimental data fitted well the pseudo second order kinetic model and also followed the intraparticle diffusion model. The Langmuir and Freundlich isotherms were employed to study the sorption capacity of sorbent. The Langmuir isotherm model was found to describe adequately the sorption process. Thermodynamic parameters, such as the changes of free energy, enthalpy and entropy were calculated. The sorption was found to be endothermic in nature and thermodynamically favourable. An optimum zinc ions removal of about 99% was obtained at a pH value of 6, a sorbent dosage of 0.5 g/50 mL of zinc solution and an initial zinc concentration of 50 mg L-1. The results showed that the magnesite tailing is a suitable sorbent for the removal of zinc from aqueous solutions.