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A multitechnique study of the interactions between H+, Na+, Ca2+ and Cu2+, and two types of softwood Kraft fibre materials

Sundman, Ola; Persson, Per LU and Ohman, Lars-Olof (2008) In Journal of Colloid and Interface Science 328. p.248-256
Abstract
Aiming for a better understanding of the interactions between water suspended cellulose fibres and metal ions, this study was focused on characterising the interactions between Ca2+. Cu2+ and two different fibre materials-a fully bleached softwood Kraft pulp, and a chemically modified fully bleached softwood Kraft fibre material. The study was conducted as a function of pH (2-7), and both in the absence and presence of an excess of Na+ ions, 0-100 mM Na(Cl). For both fibre materials, adsorption data collected in the absence of Na+ were fully explained by the unspecific Donnan ion-exchange model. However, in an excess of Na(Cl), data clearly indicated that higher amounts of divalent metal ions adsorbed, than predicted by the Donnan model.... (More)
Aiming for a better understanding of the interactions between water suspended cellulose fibres and metal ions, this study was focused on characterising the interactions between Ca2+. Cu2+ and two different fibre materials-a fully bleached softwood Kraft pulp, and a chemically modified fully bleached softwood Kraft fibre material. The study was conducted as a function of pH (2-7), and both in the absence and presence of an excess of Na+ ions, 0-100 mM Na(Cl). For both fibre materials, adsorption data collected in the absence of Na+ were fully explained by the unspecific Donnan ion-exchange model. However, in an excess of Na(Cl), data clearly indicated that higher amounts of divalent metal ions adsorbed, than predicted by the Donnan model. Therefore, to model these data, specific metal ion-fibre surface complexes were assumed to form, in addition to the Donnan ion-exchange. A neutral surface species involving two Surface carboxylate groups and one metal ion was, for both metal ions, found to yield a good description of data at all ionic strengths. In the case of Cu2+ the existence of this complex was corroborated by Cu K-edge EXAFS data, suggesting that copper ions interacts directly with carboxyl groups present int the fibres. EXAFS data also indicate that one Cu2+ interacts with two carboxyls. (C) 2008 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
328
pages
248 - 256
publisher
Elsevier
external identifiers
  • scopus:75749137588
ISSN
1095-7103
DOI
10.1016/j.jcis.2008.09.027
language
English
LU publication?
no
id
e71ec84c-fe3e-41ce-9e43-e051a44f2537 (old id 4332392)
date added to LUP
2014-03-04 09:39:19
date last changed
2017-01-01 04:25:36
@article{e71ec84c-fe3e-41ce-9e43-e051a44f2537,
  abstract     = {Aiming for a better understanding of the interactions between water suspended cellulose fibres and metal ions, this study was focused on characterising the interactions between Ca2+. Cu2+ and two different fibre materials-a fully bleached softwood Kraft pulp, and a chemically modified fully bleached softwood Kraft fibre material. The study was conducted as a function of pH (2-7), and both in the absence and presence of an excess of Na+ ions, 0-100 mM Na(Cl). For both fibre materials, adsorption data collected in the absence of Na+ were fully explained by the unspecific Donnan ion-exchange model. However, in an excess of Na(Cl), data clearly indicated that higher amounts of divalent metal ions adsorbed, than predicted by the Donnan model. Therefore, to model these data, specific metal ion-fibre surface complexes were assumed to form, in addition to the Donnan ion-exchange. A neutral surface species involving two Surface carboxylate groups and one metal ion was, for both metal ions, found to yield a good description of data at all ionic strengths. In the case of Cu2+ the existence of this complex was corroborated by Cu K-edge EXAFS data, suggesting that copper ions interacts directly with carboxyl groups present int the fibres. EXAFS data also indicate that one Cu2+ interacts with two carboxyls. (C) 2008 Elsevier Inc. All rights reserved.},
  author       = {Sundman, Ola and Persson, Per and Ohman, Lars-Olof},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {248--256},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {A multitechnique study of the interactions between H+, Na+, Ca2+ and Cu2+, and two types of softwood Kraft fibre materials},
  url          = {http://dx.doi.org/10.1016/j.jcis.2008.09.027},
  volume       = {328},
  year         = {2008},
}