Cadmium ion adsorption on carboxyl-terminated iron oxide beads

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


研究成果: Article査読

1 被引用数 (Scopus)


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.

ジャーナルJournal of Physical Chemistry B
出版ステータスPublished - 2004 8月 19

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学


「Cadmium ion adsorption on carboxyl-terminated iron oxide beads」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。