Removing Cyanide from Aqueous Solutions using Iron Nano Particle Resin(Lewatit FO36)

Cyanide, an environmental pollutant which is found in many different industrial effluents, causes water resources pollution being hazardous to human and environment. Cyanide can be removed from aqueous solutions by different methods but most of them are very expensive. In this study, Lewatit FO36 exchange resin was used to remove Cyanide in a batch system. Removing the cyanide from the aqueous solutions with the Lewatit FO36 exchange resin was studied via considering the effects of absorbent dose, initial cyanide concentration, contact time and pH in batch phase. The Batch ion-exchange process reached equilibrium inr about 90 minutes of contact. The ion-exchange process, which is pH dependent showed maximum removal of CN in the pH range 5.0-9.0 for an initial CN concentration of 1 mg L-1. Lewatit FO 36 showed high bonding constant. Equilibrium constant which depends on the ion-exchange capacity was calculated using Longmuir adsorption isotherm. It was observed that the maximum ion-exchange capacity for Lewatit FO36 was achieved at optimum pH value of 6.5. The ion exchange of CN on this cation-exchange resin followed first-order reversible kinetics. According to the results, for its regeneration characteristic, Liwatit FO36 resin can be used as a convenient option to reduce the level of CN from the aqueous solutions.