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On the Anomalous Adsorption of [Pd(edta)](2-) at the Water/Goethite Interface: Spectroscopic Evidence for Two Types of Surface Complexes.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2008 (English)In: Langmuir, ISSN 0743-7463, Vol. 24, no 2, 483-9 p.Article in journal (Refereed) Published
Abstract [en]

The structure of palladium(II) ethylenediaminetetraacetate (edta) in aqueous solutions and its adsorption on the surface of goethite (-FeOOH) were studied using extended X-ray absorption fine structure spectroscopy and attenuated total reflection Fourier transform infrared spectroscopy. The obtained results show that in aqueous solutions, Pd-edta exists as a 1:1 complex, [Pd(edta)]2-, with edta acting as a quadridentate ligand. On the surface of goethite, [Pd(edta)]2- forms two different types of complexes over a pH range of 3.40-8.12. At pH < 5, [Pd(edta)]2- adsorbs as an outer-sphere species with possible hydrogen bonding. At higher pH values, the formation of inner-sphere complexes of the cation-type sets in after a cleavage of one glycinate ring and the formation of an (edta)Pd-O-Fe linkage.

Place, publisher, year, edition, pages
2008. Vol. 24, no 2, 483-9 p.
Identifiers
URN: urn:nbn:se:umu:diva-6957DOI: doi:10.1021/la702735yPubMedID: 18095725OAI: oai:DiVA.org:umu-6957DiVA: diva2:146627
Note
Web Release Date: December 21, 2007Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2011-01-10Bibliographically approved

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