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

Ramstedt, M.; Norgren, C.; Shchukarev, A.; Sjoberg, S. and Persson, Per LU (2005) In Journal of Colloid and Interface Science 285. p.493-501
Abstract
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... (More)
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. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Colloid and Interface Science
volume
285
pages
493 - 501
publisher
Elsevier
external identifiers
  • scopus:17444371714
ISSN
1095-7103
DOI
10.1016/j.jcis.2004.12.003
language
English
LU publication?
no
id
850004c5-e587-4ad5-804d-636b2086a83b (old id 4332494)
date added to LUP
2014-03-04 09:40:56
date last changed
2017-05-21 03:33:12
@article{850004c5-e587-4ad5-804d-636b2086a83b,
  abstract     = {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.},
  author       = {Ramstedt, M. and Norgren, C. and Shchukarev, A. and Sjoberg, S. and Persson, Per},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {493--501},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Co-adsorption of cadmium(II) and glyphosate at the water-manganite (gamma-MnOOH) interface},
  url          = {http://dx.doi.org/10.1016/j.jcis.2004.12.003},
  volume       = {285},
  year         = {2005},
}