Adsorption of zinc and cyanide from cyanide effluents on anionic ion-exchange resin

Abstract

The adsorption of zinc and cyanide from cyanide effluents onto strong and weak basic anion exchange resins was studied in a batch adsorption system. Factors influencing the adsorption rates such as resin selection, resin amounts, contact time and temperature were studied and scanning electron microscopy-energy disperse spectroscopy( SEM-EDS) was used in the analysis. The present study shows that the adsorption capacity of resin 201×7 is better than that of resin 301. The adsorption process was relatively fast and came to equilibrium after 60 min. The kinetic data were analyzed with three models and the pseudo-second-order kinetic model was found to agree with the experimental data well. The equilibrium data could also be described well by Langmuir isotherm model. Thermodynamic parameters such as enthalpy change(ΔH ⁰), free energy change(ΔG ⁰) and entropy change(ΔS ⁰) were calculated and the adsorption process was spontaneous and endothermic.

Keywords

Ion-exchange / Adsorption / Adsorption isotherm / Adsorption kinetics / Thermodynamic parameter

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