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Per Persson. Foto.

Per Persson

Dekan

Per Persson. Foto.

Co-adsorption of cadmium(II) and glyphosate at the water-manganite (gamma-MnOOH) interface

Författare

  • M. Ramstedt
  • C. Norgren
  • A. Shchukarev
  • S. Sjoberg
  • Per Persson

Summary, in English

The co-adsorption of Cd(II) and glyphosate (N-(phosphonomethyl)glycine, PMG) at the manganite (gamma-MnOOH) surface has been studied in the pH range 6-10 at 25 degrees C and with 0.1 M Na(Cl) as ionic medium. Batch adsorption experiments, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine Structure (EXAFS) spectroscopy were used for the quantitative analysis and the determination of the molecular structure of the surface complexes. The adsorption of Cd(II) and PMG in the ternary Cd(II)-PMG-manganite system was compared with the adsorption in the binary U(II)-manganite and PMG-manganite systems. The formation of three inner sphere Surface complexes was observed, a tertiary Cd(II)-PMG-manganite complex, a binary Cd(II)-manganite complex and a binary RMG-manganite complex. The surface concentration of the ternary complex and the Cd(II)-manganite complex was more or less constant throughout the pH range studied. However, the Surface concentration of the binary PMG-manganite complex decreased with increasing pH. The major part of the binary PMG-surface complex was protonated. The ternary surface complex displayed a type B structure (Cd(II)-PMG-manganite). The average Cd-Mn distance obtained from EXAFS (3.26 angstrom) indicates that the binary and ternary Cd(II)-surface complexes are formed by edge-sharing of Mn and Cd octahedra on the (0 10) plane of the manganite crystals. (c) 2004 Elsevier Inc. All rights reserved.

Publiceringsår

2005

Språk

Engelska

Sidor

493-501

Publikation/Tidskrift/Serie

Journal of Colloid and Interface Science

Volym

285

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Earth and Related Environmental Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1095-7103