Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 92, Issue 3, Pages 315-326Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-3894(02)00026-2
Keywords
sodium dodecylsulfate; montmorillonite; Cu2+; Zn2+; sorption isotherm; kinetics
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Removal of Cu2+ and Zn2+ from aqueous solutions by sorption on the montmorillonite modified with sodium dodecylsulfate (SDS) was investigated. Experiments were carried out as a function of solution pH, solute concentration, and temperature (25-55 degreesC). The Dubinin-Kaganer-Radushkevick model was adopted to describe the single-solute sorption isotherms. Also, the binary-solute sorption equilibria could be reasonably predicted by the competitive Langmuir model, in which the Langmuir parameters were directly taken from those obtained in single-solute systems. The thermodynamic parameters (DeltaH(o) and DeltaS(o)) for Cu2+ and Zn2+ sorption on the modified clay were also determined from the temperature dependence. The kinetics of metal ions sorption was examined and the pseudo-first-order rate constant was finally evaluated. (C) 2002 Elsevier Science B.V. All rights reserved.
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