Comparison of ion exchange and Donnan equilibrium models for the pH-dependent adsorption of sodium and calcium ions onto kraft wood pulp fibers

Wassana Yantasee, G. L. Rorrer

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The ion exchange and Donnan equilibrium models were compared for predicting the multi-component adsorption of hydrogen, sodium and calcium ions onto kraft wood pulp fibers. At pH 2.7-6, the Donnan model predicted the adsorption of Na and Ca ions onto both bleached and unbleached wood fibers better than the ion exchange model. The Donnan model assumed a non-site specific distribution of metal ions between charged fiber and external solution phases and and a carboxylate site specific adsorption of hydrogen ions.

Original languageEnglish (US)
Pages (from-to)157-185
Number of pages29
JournalJournal of Wood Chemistry and Technology
Volume22
Issue number2-3
DOIs
StatePublished - May 2002
Externally publishedYes

Fingerprint

Pulp
Calcium
Ion exchange
Wood
Sodium
Ions
Adsorption
Fibers
Hydrogen
Metal ions
Protons

Keywords

  • Donnan
  • Ion exchange
  • Nonprocess element
  • Wood pulp

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Chemical Engineering (miscellaneous)

Cite this

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AB - The ion exchange and Donnan equilibrium models were compared for predicting the multi-component adsorption of hydrogen, sodium and calcium ions onto kraft wood pulp fibers. At pH 2.7-6, the Donnan model predicted the adsorption of Na and Ca ions onto both bleached and unbleached wood fibers better than the ion exchange model. The Donnan model assumed a non-site specific distribution of metal ions between charged fiber and external solution phases and and a carboxylate site specific adsorption of hydrogen ions.

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