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Isothermal and kinetic adsorption behaviour of Pb2 + ions on natural silicate minerals

Published online by Cambridge University Press:  09 July 2018

Y. S. AL-Degs ,
M. F. Tutunji  and
H. M. Baker
Y. S. AL-Degs*
Affiliation:
Chemistry Department, The Hashemite University, P.O. Box 150459, Zarqa 13115
M. F. Tutunji
Affiliation:
Department of Chemistry, University of Jordan, AmmanJordan
H. M. Baker
Affiliation:
Department of Chemistry, University of Jordan, AmmanJordan
*
*E-mail: E-mail: [email protected]
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Abstract

Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Based on the preliminary screening studies, the adsorbents were effective at retaining Pb2+ ions from solution. A strong correlation was observed between the cation exchange capacity of clay samples and their function as adsorbents of Pb2+ ions. An adsorption isotherm of Pb ions on Petra clay was measured at 30ºC and at a concentration range of 0 –200 mg dm–3. Over the entire concentration range, the Langmuir isotherm gave a good representation of adsorption data, which confirms the formation of one molecular layer of adsorbate on the clay surface. Two variables were investigated to elucidate the rate-limiting steps of adsorption: the effect of initial concentration of Pb2+ and the effect of solution temperature. It is concluded that external diffusion was the only mechanism in operation in the adsorption process. It has been noted that adsorption of Pb2+ by natural clay is a fast process, where 80% of equilibrium capacity was established within the first minutes of interaction.

Keywords

clay depositsheavy metalsadsorptiondiffusion and rate-limiting steps
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 4 , December 2003 , pp. 501 - 509
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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