Danish, Mohammed and Hashim, Rokiah and Rafatullah, Mohd and Sulaiman, Othman and Ahmad, Anees and -, Govind (2011) Adsorption of Pb(II) Ions from Aqueous Solutions by Date Bead Carbon Activated with ZnCl2. CLEAN - Soil, Air, Water, 39 (4). pp. 392-399. ISSN 1863-0650

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Abstract

This study reports on the adsorption characteristics of Pb(II) ions from aqueous solutions using ZnCl2-activated date (Phoenix dactylifera) bead (ADB) carbon with respect to change in adsorbent dosage, initial pH, contact time, initial concentration, and temperature of the solution. Kinetic studies of the data showed that the adsorption follows the pseudo-second-order kinetic model. Thermodynamic parameters, enthalpy change (ΔH° = 55.11 kJ/mol), entropy change (ΔS° = − 0.193 kJ/mol/K), and Gibbs free energy change (ΔG°) were also calculated for the uptake of Pb(II) ions. These parameters show that adsorption on the surface of ADB was feasible, spontaneous in nature, and endothermic between temperatures of 298.2 and 318.2 K. The equilibrium data better fitted the Langmuir and Freundlich isotherm models than the D–R adsorption isotherm model for studying the adsorption behavior of Pb(II) onto the ADB carbon. It could be observed that the maximum adsorption capacity of ADB was 76.92 mg/g at 318.2 K and pH 6.5.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s John Wiley & Sons.
Uncontrolled Keywords:	Adsorption; Date bead; Kinetic; Monolayer; Pb(II) ion; Thermodynamic
Subjects:	Marine & Freshwater Biology Water Resources
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	31 Oct 2012 07:23
Last Modified:	31 Oct 2012 07:23
URI:	http://npl.csircentral.net/id/eprint/780

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