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Thermodynamic and Kinetic Study of the Adsorption of Pb (II) from Aqueous Solution Using Bentonite and Activated Carbon

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Author(s): Ziad T. Abd Ali | Bassim Hameed Graimed

Journal: Al-Khawarizmi Engineering Journal
ISSN 1818-1171

Volume: 9;
Issue: 2;
Start page: 48;
Date: 2013;
Original page

Keywords: Bentonite | Activated carbon | lead ions | Adsorption | Kinetic.

ABSTRACT
The adsorption of Pb(II) ions onto bentonite and activated carbon was investigated. The effects of pH, initial adsorbent dosage, contact time and temperature were studied in batch experiments. The maximum adsorption capacities for bentonite and activated carbon were 0.0364 and 0.015 mg/mg, respectively. Thermodynamic parameters such as Gibbs free energy change, Enthalpy change and Entropy change have been calculated. These thermodynamic parameters indicated that the adsorption process was thermodynamically spontaneous under natural conditions and the adsorption was endothermic in nature. Experimental data were also tested in terms of adsorption kinetics, the results showed that the adsorption processes followed well pseudo second- order kinetics.
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