The adsorption of Pb (II) ions from aqueous solution onto the prepared ZnO nanoparticles was investigated. The effect of initial metal ion concentration, contact time, pH and temperature were studied in batch experiments. The Freundlich and Langmuir models were used to describe the uptake of these heavy metals on nano-metal oxide. The equilibrium process was described by the Langmuir isotherm model, with maximum adsorption capacity of 5000 mg/g at temperature 303 K. Thermodynamic parameters like, free energy (G° = -52.3981 kJmol-1), enthalpy (H°= -27.981 kJmol-1) and entropy (S° = -86.807 JK-1mol-1) of adsorption were calculated. These parameters showed the adsorption of Pb (II) ions onto ZnO nanoparticles was feasible, spontaneous and exothermic process in nature. Based on these results, it seems that nano ZnO particles have a significant potential for removing Pb (II) ions from wastewater.
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