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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Adsorption of metal ions onto Moroccan stevensite: Kinetic and isotherm studies
Journal of Colloid and Interface Science, Volume 282, No. 2, Year 2005
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Description
The aim of this paper is to study the adsorption of the heavy metals (Cd(II), Cu(II), Mn(II), Pb(II), and Zn(II)) from aqueous solutions by a natural Moroccan stevensite called locally rhassoul. We carried out, first, a mineralogical and physicochemical characterization of stevensite. The surface area is 134 m 2/g and the cation exchange capacity (CEC) is 76.5 meq/100 g. The chemical formula of stevensite is Si 3.78Al 0.22Mg 2.92Fe 0.09Na 0.08K 0.08O 10(OH) 24H 2O. Adsorption tests of Cd(II), Cu(II), Mn(II), Pb(II), and Zn(II) in batch reactors were carried out at ambient temperature and at constant pH. Two simplified models including pseudo-first-order and pseudo-second- order were used to test the adsorption kinetics. The equilibrium time and adsorption rate of adsorption were determined. The increasing order of the adsorption rates follows the sequence Mn(II)>Pb(II)>Zn(II)>Cu(II)>Cd(II). The Dubinin-Radushkevich (D-R), Langmuir, and Redlich-Peterson (R-P) models were adopted to describe the adsorption isotherms. The maximal adsorption capacities at pH 4.0 determined from the D-R and Langmuir models vary in the following order: Cu(II)>Mn(II)>Cd(II)>Zn(II)>Pb(II). The equilibrium data fitted well with the three-parameter Redlich-Peterson model. The values of mean energy of adsorption show mainly an ion-exchange mechanism. Also, the influence of solution pH on the adsorption onto stevensite was studied in the pH range 1.5-7.0. © 2004 Elsevier Inc. All rights reserved.
Authors & Co-Authors
Benhammou, A.
Morocco, Marakech
Faculté Des Sciences Semlalia
Yaacoubi, Abdelrani
Morocco, Marakech
Faculté Des Sciences Semlalia
Nibou, Lahbib
Morocco, Safi
Ecole Supérieure de Technologie de Safi
Tanouti, Boumediene
Morocco, Marakech
Faculté Des Sciences Semlalia
Statistics
Citations: 327
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/j.jcis.2004.08.168
ISSN:
00219797