Cadmium ion adsorption on carboxyl-terminated iron oxide beads

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

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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

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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