Cadmium ion adsorption on carboxyl-terminated iron oxide beads

Jun Wu, Josephine Sun, Ionel C. Stefan, Daniel Alberto Scherson

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The affinity of Cd 2+ toward carboxyl-terminated iron oxide beads (C-TIOB, Sigma) suspended in aqueous solutions was investigated using anodic stripping voltammetry (ASV) as a function of both pH and [Cd 2+] in the μM range. Advantage was taken of the superparamagnetic character of C-TIOB to confine and/or remove the beads within the enclosed vessel, using an external magnet, and thus assess the influence of dispersed C-TIOB on the amount of Cd 2+ detected by ASV. Within experimental error, the difference between ASV data recorded before and after adding and then confining the particles by magnetic means, which provides a measure of the amount of Cd 2+ adsorbed on C-TIOB, was found to yield results comparable to those of identical measurements with fully dispersed C-TIOB. Adsorption data collected as a function of [Cd 2+] and pH revealed a marked increase in the binding constant of Cd 2+ for carboxylate ions upon attachment to the solid support, over values predicted strictly from standard solution phase equilibria.

Original languageEnglish
Pages (from-to)12276-12279
Number of pages4
JournalJournal of Physical Chemistry B
Volume108
Issue number33
DOIs
Publication statusPublished - 2004 Aug 19
Externally publishedYes

Fingerprint

anodic stripping
Voltammetry
Cadmium
Iron oxides
iron oxides
beads
cadmium
Adsorption
Ions
adsorption
Magnets
ions
Phase equilibria
confining
carboxylates
attachment
vessels
affinity
magnets
aqueous solutions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Wu, J., Sun, J., Stefan, I. C., & Scherson, D. A. (2004). Cadmium ion adsorption on carboxyl-terminated iron oxide beads. Journal of Physical Chemistry B, 108(33), 12276-12279. https://doi.org/10.1021/jp047360j

Cadmium ion adsorption on carboxyl-terminated iron oxide beads. / Wu, Jun; Sun, Josephine; Stefan, Ionel C.; Scherson, Daniel Alberto.

In: Journal of Physical Chemistry B, Vol. 108, No. 33, 19.08.2004, p. 12276-12279.

Research output: Contribution to journalArticle

Wu, J, Sun, J, Stefan, IC & Scherson, DA 2004, 'Cadmium ion adsorption on carboxyl-terminated iron oxide beads', Journal of Physical Chemistry B, vol. 108, no. 33, pp. 12276-12279. https://doi.org/10.1021/jp047360j
Wu, Jun ; Sun, Josephine ; Stefan, Ionel C. ; Scherson, Daniel Alberto. / Cadmium ion adsorption on carboxyl-terminated iron oxide beads. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 33. pp. 12276-12279.
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