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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

Author:
  • Marina Kaplun
  • Agneta Nordin
  • Per Persson
Publishing year: 2008
Language: English
Pages: 483-489
Publication/Series: Langmuir
Volume: 24
Document type: Journal article
Publisher: The American Chemical Society (ACS)
Additional info: 2

Abstract 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.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 0743-7463
Per Persson
E-mail: per [dot] persson [at] biol [dot] lu [dot] se

Professor

MEMEG

+46 46 222 17 96

+46 70 266 38 79

E-C350

50

Professor

Centre for Environmental and Climate Research (CEC)

+46 46 222 17 96

+46 70 266 38 79

D350

Ekologihuset, Sölvegatan 37, Lund

50