Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/2847
Title: Separation of Zn(II) by sorption onto powdered marble wastes
Authors: Ghazy, S E
Gad, A H M
Keywords: Zinc(II) sorption
Langmuir
Dubinin-Radushkevich isotherm
Marble waste
Natural water
Issue Date: Sep-2008
Publisher: CSIR
Abstract: Batch adsorption experiments were carried out to remove Zn(II) ions from aqueous solutions and water samples using powdered marble wastes (PMW) as an effective sorbent which is inexpensive, widespread, and considered as an environmental problem. The parameters such as solution pH, sorbent and Zn(II) concentrations, stirring times, foreign ions and temperature were investigated. The sorption of Zn(II) ions onto (PMW) is described by Langmuir model. Dubinin-Radushkevich (D-R) isotherm model was also applied to describe the nature of the adsorption of the metal. Thermodynamic parameters, viz. the Gibbs free energy change (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were also calculated. These parameters indicated that the adsorption process of Zn(II) ions on PMW was spontaneous and endothermic in nature. Under the optimum experimental conditions employed, the removal of ~100% of Zn(II) ions was attained. The procedure was successfully applied to remove Zn(II) ions from aqueous and different natural water samples. The adsorption mechanism is also suggested.
Description: 433-442
URI: http://hdl.handle.net/123456789/2847
ISSN: 0971–457X
Appears in Collections:IJCT Vol.15(5) [September 2008]

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