On the anomalous adsorption of [Pd(edta)](2-) at the water/goethite interface: Spectroscopic evidence for two types of surface complexes

Summary, in English

The structure of palladium(II) ethylenediaminetetraacetate (edta) in aqueous solutions and its adsorption on the surface of goethite (alpha-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, [P(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.

• Författare: Marina Kaplun; Agneta Nordin; Per Persson
• Publiceringsår: 2008
• Språk: Engelska
• Sidor: 483-489
• Publikation/Tidskrift/Serie: Langmuir
• Volym: 24
• Länkar: http://dx.doi.org/10.1021/la702735y
• Dokumenttyp: Artikel i tidskrift
• Förlag: The American Chemical Society (ACS)
• Ämne: Earth and Related Environmental Sciences
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0743-7463