Complex formation and adsorption of V3+, Cr3+ and Fe3+ ions with poly(N-vinylimidazole) |
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Authors: | N Pekel H Sava? O Güven |
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Institution: | (1) Department of Chemistry Hacettepe University, 06532 Beytepe Ankara, Turkey e-mail: nursel@hacettepe.edu.tr, TR |
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Abstract: | The complex formation of soluble poly (N-vinylimidazole) (PVIm) with trivalent metal ions in aqueous solution was studied by using UV–vis spectroscopy. Formation
constants of PVIm–metal complexes were calculated by applying the “molar ratio” method. It was found that the interaction
between PVIm and trivalent metal ions follows 4(base unit):1(metal ion) stoichiometry. The stability constants for the complexes
of PVIm with trivalent transition-metal ions were in agreement with the Irving– William series. The biggest formation constant
was found for the PVIm–Fe3+ complex system. The capacity of adsorption for these metal ions was investigated using cross-linked PVIm. Cross-linked PVIm
hydrogels were prepared by irradiating binary mixture of N-vinylimidazole–water with a 60Co γ-ray source having a dose rate of 4.5 kGy/h. Adsorption studies were performed at different pH and metal ion concentrations
at room temperature. It was observed that the same sequence for the metal ions was verified by adsorption studies.
Received: 28 May 2001 Accepted: 29 July |
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Keywords: | Poly(N-vinyl imidazole) Molar ratio method Trivalent metal ions Adsorption |
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