The Adsorption of Lead using Olive Cake Ash
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Date
2018-11-22
Authors
سودي, ميساء ابراهيم يونس
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Publisher
An-Najah National University
Abstract
The adsorption of Pb(II) ions from aqueous solution using olive cake ash was carried out. The effect of various parameters on the adsorption process such as pH, contact time and temperature were studied. Performed experiments included; binding capacity, stripping, hard cations interferences and adsorption isotherms on adsorption process. Results showed that the maximum adsorption of Pb(II) ions occurred at pH 5, equilibrium was achieved at 40 minutes. The removal of Pb(II) ions increased from 91.3% to 94.5% as the temperature increased from 0°C to 70°C. The binding capacity was determined to be 0.29 mg/g at 28°C. The highest total stripping for Pb(II) ions reached 100 % by 0.5 M HCl. The presence of combined Ca(II) and Mg(II) with Pb(II) ions causes a significant increase in binding. This increase in binding reached maximum (higher by 22%) when the following concentrations of Ca(II) and Mg(II) were present at 2 mM, 4 mM, 20 mM and 400 mM higher than when no Ca(II) and Mg(II) present. The isotherms results showed that the experimental data best obeys Fruindlich and Dubbinin models. Values of ΔG° at different temperatures (13°C, 23°C and 35°C) were 19.87 KJ/mol, 10.29 KJ/mol and 20.45 KJ/mol, respectively. This indicates that the adsorption process is non spontaneous. In addition, the negative value of ΔHº means that the adsorption of Pb(II) ions onto treated ash was exothermic, also the value of ΔSº was negative indicating a decrease in entropy. The values of mean free energy E per molecule sorbate at different temperatures are in the range (8 – 16) KJ/mol. This indicates a chemical adsorption.