Ferrous Ion Oxidation Behavior on a Bacteria Attached Power Micro Electrode

Abstract:

In this paper a special At.f (Acidthiobacillus ferrooxidans) modified carbon powder microelectrode was prepared, and a series of electrochemical measurements were conducted to study ferrous ion Fe^{2 +} oxidation mechanism on the electrode. CV (cyclic voltammetry) studies show that this oxidation reaction is reversible when c (Fe^{2 +}) is lower than 0.16mol/L. At higher speed scanning, the currents through the electrode include two parts of the micro disc current and the thin layer current, while at lower speed scanning of steady state process the current provided by thin layer could be ignored, the whole oxidation reaction was controlled by diffusion process, and the calculated diffusion coefficient D₀ is about 6. 25 ×10 ^{- 6}cm².s ^{– 1}. The transient potential stair step studies also have been conducted. The results are consistence with steady state ones although thin layer currents should be taken in to account.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2699-2704
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2699
• Online since: May 2011
• Authors: Hong Xu Li, Bei Jin, Chuan Qi Jiao, Bin Bin Liu
• Keywords: Acidthiobacillus ferroxidans, Bio Oxidation, Ferrous Ion, Powder Microelectrode

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