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Adsorption mechanisms of glucose in aqueous goethite suspensions

Olsson, Rickard; Giesler, Reiner and Persson, Per LU (2011) In Journal of Colloid and Interface Science 353. p.263-268
Abstract
The adsorption of glucose and polysaccharides onto solid surfaces is important in several areas of science and engineering including soil chemistry and mineral processing. In this work we have studied the adsorption of D-glucose at the water-goethite (alpha-FeOOH) interface as a function of pH using batch adsorption measurements and a simultaneous infrared and potentiometric technique. Molecular orbital calculations were also performed in order to support interpretations of the infrared spectroscopic data. Infrared spectroscopy has shown that glucose adsorbs at the water-goethite interface with an intact ring structure and that the beta-form is favored relative to the alpha isomer. The collective spectroscopic and macroscopic results were... (More)
The adsorption of glucose and polysaccharides onto solid surfaces is important in several areas of science and engineering including soil chemistry and mineral processing. In this work we have studied the adsorption of D-glucose at the water-goethite (alpha-FeOOH) interface as a function of pH using batch adsorption measurements and a simultaneous infrared and potentiometric technique. Molecular orbital calculations were also performed in order to support interpretations of the infrared spectroscopic data. Infrared spectroscopy has shown that glucose adsorbs at the water-goethite interface with an intact ring structure and that the beta-form is favored relative to the alpha isomer. The collective spectroscopic and macroscopic results were fully consistent with an adsorption mechanism where glucose interacts with goethite surface sites via hydrogen bonding interactions. Specific infrared peak shifts indicated that glucose primarily acts as a hydrogen bond donor and that it interacts with acceptor sites that become increasingly more prevalent as the surface is deprotonated. These results are in general agreement with the acid/base model for mono- and polysaccharide interactions at metal oxide surfaces, but contradict the inner sphere hypothesis that was proposed based on ex situ spectroscopic measurements. (c) 2010 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
353
pages
263 - 268
publisher
Elsevier
external identifiers
  • scopus:77958479643
ISSN
1095-7103
DOI
10.1016/j.jcis.2010.09.023
language
English
LU publication?
no
id
dcc1aaf5-9e38-47e2-8d37-42ede8880c05 (old id 4332298)
date added to LUP
2014-03-04 09:45:58
date last changed
2017-01-01 03:11:50
@article{dcc1aaf5-9e38-47e2-8d37-42ede8880c05,
  abstract     = {The adsorption of glucose and polysaccharides onto solid surfaces is important in several areas of science and engineering including soil chemistry and mineral processing. In this work we have studied the adsorption of D-glucose at the water-goethite (alpha-FeOOH) interface as a function of pH using batch adsorption measurements and a simultaneous infrared and potentiometric technique. Molecular orbital calculations were also performed in order to support interpretations of the infrared spectroscopic data. Infrared spectroscopy has shown that glucose adsorbs at the water-goethite interface with an intact ring structure and that the beta-form is favored relative to the alpha isomer. The collective spectroscopic and macroscopic results were fully consistent with an adsorption mechanism where glucose interacts with goethite surface sites via hydrogen bonding interactions. Specific infrared peak shifts indicated that glucose primarily acts as a hydrogen bond donor and that it interacts with acceptor sites that become increasingly more prevalent as the surface is deprotonated. These results are in general agreement with the acid/base model for mono- and polysaccharide interactions at metal oxide surfaces, but contradict the inner sphere hypothesis that was proposed based on ex situ spectroscopic measurements. (c) 2010 Elsevier Inc. All rights reserved.},
  author       = {Olsson, Rickard and Giesler, Reiner and Persson, Per},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {263--268},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Adsorption mechanisms of glucose in aqueous goethite suspensions},
  url          = {http://dx.doi.org/10.1016/j.jcis.2010.09.023},
  volume       = {353},
  year         = {2011},
}