Title: Adsorption of molybdate ion by natrolite and clinoptilolite-rich tuffs

Authors: H. Faghihian, A. Malekpour, M.G. Maragheh

Addresses: Department of Chemistry, University of Isfahan, Isfahan, Iran. Department of Chemistry, University of Isfahan, Isfahan, Iran. Jaber-bin-Hayan Laboratories, AEOI, Tehran, Iran

Abstract: Natural clinoptilolite-rich tuffs and natrolite from Iranian deposits and their different ion-exchanged forms were used for the adsorption of ⁹⁹Mo as molybdate ion. The effect of pH, contact time, initial molybdate concentration, and some cationic and anionic interferences were also studied. To investigate the selectivity of zeolites and their exchanged forms, the isotherms of adsorption were constructed at room temperature. Desorption experiments were carried out to examine the ability of zeolite to retain adsorbed molybdate. It was concluded that molybdate could be considerably adsorbed by some of the exchanged forms of the zeolites (Ag⁺, Cd²⁺ and Pb²⁺ exchanged forms) whereas the uptake by the natural forms was negligible.

Keywords: adsorption; clinoptilolite; molybdate; natrolite; eolites.

DOI: 10.1504/IJEP.2002.000704

International Journal of Environment and Pollution, 2002 Vol.18 No.2, pp.181-189

Published online: 14 Jul 2003 *

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