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Details van artikel 27 van 34 gevonden artikelen
| Titel: |
Preparation, characterization and applications of polyurethane foam functionalized with resorcinol for quantitative separation and determination of silver(I) and mercury(II) from tap and wastewater |
| Auteur: |
Moawed, Elhossein Ali Zaid, Mohamed Ahmed El-Shahat, Mohamed Fathy |
| Verschenen in: |
International journal of environmental analytical chemistry |
| Paginering: | Jaargang 84 (2004) nr. 12 pagina's 935-946 |
| Jaar: |
2004-10-15 |
| Inhoud: |
A stable chelating resin matrix was prepared by covalently linking resorcinol with polyurethane foam matrix through a -N=N- group. Preconcentration and determination of trace Ag+ and Hg2+ ions from samples of different origin, using Res-PUF, were studied. Various conditions influencing the sorption of these metal ions onto Res-PUF were optimized. The kinetics of sorption of the Ag+ and Hg2+ by Res-PUF were found to be fast, reached equilibrium in few minutes (5-10 min) and followed a first-order rate equation with an overall rate constant k in 0.102 and 0.267/min, respectively. Study of the variation of the sorption of the tested metal ions with temperature yielded average values for ΔG, ΔH and ΔS of -3.94, -22.02 and -58.37, respectively. The mean free sorption energy (E) computed from the Dubinin-Radushkevich (D-R) isotherm was found to be equal to 8.91 kJ/mol, which reflects the chelation sorption process. The capacities of the foam material were 0.15 and 0.07 mmol/g for Ag+ and Hg2+, respectively. Preconcentration factors of > 50 were achieved (RSD ≈ 5.99). The proposed preconcentration procedure was applied successfully to the determination of trace metal ions in natural and wastewater samples. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 27 van 34 gevonden artikelen
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