Abstract
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°C). 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 (ΔHo and ΔSo) 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.
Original language | English |
---|---|
Pages (from-to) | 315-326 |
Number of pages | 12 |
Journal | Journal of Hazardous Materials |
Volume | 92 |
Issue number | 3 |
DOIs | |
State | Published - 10 06 2002 |
Externally published | Yes |
Keywords
- Cu
- Kinetics
- Montmorillonite
- Sodium dodecylsulfate
- Sorption isotherm
- Zn