Kinetics of metal ion binding by polysaccharide colloids

E. Rotureau, H.P. van Leeuwen

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

The dynamics of metal sorption by a gel-like polysaccharide is investigated by means of the electrochemical technique of stripping chronopotentiometry (SCP). The measured response reflects the diffusive flux properties of the metallic species in the dispersion. The colloidal ligand studied here is a functionalized carboxymethyldextran. Its complexation with Pb(II) reveals a time dependence that identifies strong differences in the dynamic nature of the successive metal complexes formed. Apparently, the formation of intramolecular bidentate complexes requires a slow conformational reorganization of the macromolecule that becomes the rate-limiting step in the complexation reaction. The relevant parameters for metal binding and release kinetics are computed and thus provide knowledge of the time-dependent stability and lability of metal polysaccharide complexes.
Original languageEnglish
Pages (from-to)7177-7184
JournalThe Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment, & General Theory
Volume112
Issue number31
DOIs
Publication statusPublished - 2008

Keywords

  • deposition potential sscp
  • stripping chronopotentiometry
  • speciation dynamics
  • ligand dispersions
  • part 1
  • complexes
  • lability
  • features
  • voltammetry
  • dextran

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