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Time-dependent surface speciation of oxalate at the water-boehmite (gamma-AlOOH) interface: Implications for dissolution

Axe, K. and Persson, Per LU (2001) In Geochimica et Cosmochimica Acta 65. p.4481-4492
Abstract
The surface speciation Of Oxalate at the water-boehmite (gamma -AlOOH) interface during adsorption and dissolution reaction,; wa,; studied by means of attenuated total reflectance infrared spectroscopy. The structural interpretations of infrared (IR) data were based on comparison with results from theoretical frequency calculations. Two different surface complexes were identified: an inner-sphere complex with a bidentate five-membered chelate structure involving both carboxylate groups; and a hydrogen-bonded surface complex with no direct bonding to Al atoms. A scheme was developed by which the surface concentrations of these complexes could be determined from IR spectroscopy data. The concentration of the hydrogen bonded complex was shown... (More)
The surface speciation Of Oxalate at the water-boehmite (gamma -AlOOH) interface during adsorption and dissolution reaction,; wa,; studied by means of attenuated total reflectance infrared spectroscopy. The structural interpretations of infrared (IR) data were based on comparison with results from theoretical frequency calculations. Two different surface complexes were identified: an inner-sphere complex with a bidentate five-membered chelate structure involving both carboxylate groups; and a hydrogen-bonded surface complex with no direct bonding to Al atoms. A scheme was developed by which the surface concentrations of these complexes could be determined from IR spectroscopy data. The concentration of the hydrogen bonded complex was shown to be strongly dependent on the experimental conditions, and the concentration of the inner-sphere complex was comparatively insensitive to the conditions within the studied experimental range. The dissolution data indicated that an excess of oxalate with respect to a critical surface concentration of oxalate was necessary to induce significant boehmite dissolution. Under dissolving conditions, the concentration of the inner-sphere complex was shown to be almost identical to this critical concentration and thus a stable entity. Copyright (C) 2001 Elsevier Science Ltd. (Less)
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author
publishing date
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Contribution to journal
publication status
published
subject
in
Geochimica et Cosmochimica Acta
volume
65
pages
4481 - 4492
publisher
Elsevier
external identifiers
  • scopus:0035676060
ISSN
0016-7037
DOI
10.1016/S0016-7037(01)00750-5
language
English
LU publication?
no
id
992037d6-cba6-4ada-b665-57818662e4eb (old id 4332598)
date added to LUP
2014-03-04 09:43:01
date last changed
2018-03-18 03:54:48
@article{992037d6-cba6-4ada-b665-57818662e4eb,
  abstract     = {The surface speciation Of Oxalate at the water-boehmite (gamma -AlOOH) interface during adsorption and dissolution reaction,; wa,; studied by means of attenuated total reflectance infrared spectroscopy. The structural interpretations of infrared (IR) data were based on comparison with results from theoretical frequency calculations. Two different surface complexes were identified: an inner-sphere complex with a bidentate five-membered chelate structure involving both carboxylate groups; and a hydrogen-bonded surface complex with no direct bonding to Al atoms. A scheme was developed by which the surface concentrations of these complexes could be determined from IR spectroscopy data. The concentration of the hydrogen bonded complex was shown to be strongly dependent on the experimental conditions, and the concentration of the inner-sphere complex was comparatively insensitive to the conditions within the studied experimental range. The dissolution data indicated that an excess of oxalate with respect to a critical surface concentration of oxalate was necessary to induce significant boehmite dissolution. Under dissolving conditions, the concentration of the inner-sphere complex was shown to be almost identical to this critical concentration and thus a stable entity. Copyright (C) 2001 Elsevier Science Ltd.},
  author       = {Axe, K. and Persson, Per},
  issn         = {0016-7037},
  language     = {eng},
  pages        = {4481--4492},
  publisher    = {Elsevier},
  series       = {Geochimica et Cosmochimica Acta},
  title        = {Time-dependent surface speciation of oxalate at the water-boehmite (gamma-AlOOH) interface: Implications for dissolution},
  url          = {http://dx.doi.org/10.1016/S0016-7037(01)00750-5},
  volume       = {65},
  year         = {2001},
}