Synthesis, physical studies and uptake behavior of: copper(II) and lead(II) by Schiff base chelating resins.

Autor: Othman MK; Department of Chemistry, University of Sana'a, Aldaree Street, Sana'a, Yemen., Al-Qadri FA, Al-Yusufy FA
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2011 May; Vol. 78 (5), pp. 1342-8. Date of Electronic Publication: 2011 Jan 04.
DOI: 10.1016/j.saa.2010.12.073
Abstrakt: Two new chelating resins possessing multiple functional groups capable of coordinating with several metal ions are reported. The resins were synthesized by condensing Schiff bases derived from 2-aminophenol, 2-hydroxy-5-chloroaniline and terephthaldehyde with formaldehyde in an alkaline medium. The effects of pH and contact time of the Cu(2+) and Pb(2+) in aqueous solutions on the uptake behavior of the resins were studied. The metal ion uptake behavior of the resins was investigated by the batch method. Both the uptake and the selectivity of the resins towards the investigated metal ions were related to the structure of the resins, type of the metal ion and the uptake conditions. The resins showed maximum uptake capacity for Cu(2+) and Pb(2+) at pH 10. Cu(2+) was seen to undergo preferential adsorption in separate and mixture solutions of Cu(2+) and Pb(2+). Kinetic studies for the resins using Langmiur equation were also performed. The Schiff base monomers and their formaldehyde resins were characterized by elemental analyses, FTIR and (1)H NMR spectroscopy. The thermal stability of the resins was studied using TGA/DTG analysis.
(Copyright © 2011 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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