Sorption of trace heavy metals by thiol containing chelating resins
The sorption of copper, cadmium, nickel and zinc ions on thiol (-SH) based chelating polymeric resins (thiomethyl resin and Duolite GT-73) has been investigated. The physical and chemical characterization of these polymers in the form of scanning electron micrographs (SEM), BET and Langmuir surface area measurements. Fourier transform infra red spectroscopy (FTIR) analysis, X-ray photoelectron spectroscopy (XPS) analysis, atomic composition measurement, sodium capacity determination and zeta potential measurements have been conducted to assess their performance as sorbents for trace toxic metal removal. Density functional theory (DFT) has been used to analyze the pore size distribution data. The adsorption of metal ions from aqueous solution on these sorbents has been studied in batch equilibrium experiments. The influence of pH on metal adsorption capacity has also been examined. The kinetic performance of these polymers has been assessed and the results have been analyzed by a pore diffusion model. The resins have been used in mini-columns to study the selectivity towards the desired metal ion. The desorption of metal ions has been studied using hydrochloric acid (1 M and 4 M), sulfuric acid (1 M and 4 M) and acidified thiourea. The present study confirms that these thiol based chelating resins are very effective for selective removal of trace heavy metals from water.
- Research Organization:
- Loughborough Univ. (GB)
- OSTI ID:
- 20019012
- Journal Information:
- Solvent Extraction and Ion Exchange, Vol. 18, Issue 1; Other Information: PBD: Jan 2000; ISSN 0736-6299
- Country of Publication:
- United States
- Language:
- English
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