Using of Isolated Hydroxyapatite from Sheep Bones to Remove Lead (II) from Aqueous Solution and Studying the Thermodynamics and Adsorption Isotherm
Keywords:
Hydroxyapatite, AdsorptionIsotherm, Lead (II), ThermodynamicsAbstract
In this paper, Cleaned sheep's bone pieces were heated at 1100°C to isolate hydroxyapatite(HAP). FTIR spectrometry and the X-ray diffractiometry was confirmed the presence of HAP. Kinetic batch experiments were used to study the adsorption behavior of Pb2+ in HAP. The isothermal models Langmuir, Freundlich, Temkin and Dubinin-Kaganer-Radushevich (DKR) were applied to describe the adsorption properties by investigation the contact time, lead concentration and temperature. The equilibrium uptake of lead ions by isolated hydroxyapatite was fitted with Langmuir isotherm model. Thermodynamic parameters free energy change (ΔGo), enthalpy change (ΔHo) and entropy change were also calculated for adsorption process of lead and the results indicated that the adsorption reaction were spontaneous(∆Go<0), endothermic (∆H o>0) and pseudo first and second order both fitted the adsorption process of lead ions on isolated hydroxyapatite.
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