Sorption performance of cysteine-modified bentonite in heavy metals uptake
A local clay, bentonite (N-Ben), was modified by the biologically-based ligand, cysteine (Cys), through a simple sorption technique. The modified sorbent (Cys-Ben) demonstrated affinity for soft and moderately soft heavy metal ions (HMI), such as Cd(II) and Pb(II), probably as a result of the soft b...
| Egile Nagusiak: | , |
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| Formatua: | Artikulua |
| Hizkuntza: | English |
| Argitaratua: |
Serbian Chemical Society
2009-01-01
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| Saila: | Journal of the Serbian Chemical Society |
| Gaiak: | |
| Sarrera elektronikoa: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2009/0352-51390907833F.pdf |
| Gaia: | A local clay, bentonite (N-Ben), was modified by the biologically-based ligand, cysteine (Cys), through a simple sorption technique. The modified sorbent (Cys-Ben) demonstrated affinity for soft and moderately soft heavy metal ions (HMI), such as Cd(II) and Pb(II), probably as a result of the soft basic character of the thiol ligand side chains. The resulting modified system was effective for metal binding with capacities of 0.503 and 0.525 mmol g-1, for Pb(II) and Cd(II), respectively. Comparative batch experiments were performed for removing lead and cadmium from aqueous solutions. The sorption parameters were derived from a Langmuir fit to the sorption isotherms of the studied ions. The study showed that the sorption capacity of Cys-Ben was higher than that of N-Ben for these ions. The effect of pH was examined over the range 2.0-6.0. The sorption capacities of Cys-Ben showed that this modified clay is a good sorbent for the examined heavy metal ions. |
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| ISSN: | 0352-5139 1820-7421 |