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

Author:
  • M. Ramstedt
  • C. Norgren
  • A. Shchukarev
  • S. Sjoberg
  • Per Persson
Publishing year: 2005
Language: English
Pages: 493-501
Publication/Series: Journal of Colloid and Interface Science
Volume: 285
Document type: Journal article
Publisher: Elsevier
Additional info: 2

Abstract 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.

Keywords

  • Earth and Related Environmental Sciences

Other

Published
  • ISSN: 1095-7103
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