Utilization of electrochemical impedance spectroscopy for monitoring pyrite oxidation in the presence and absence of Acidithiobacillus ferrooxidans
作者： Yun Liu , Zhi Dang , Guining Lu , Pingxiao Wu , Chunhua Feng
DOI: 10.1016/J.MINENG.2011.03.002
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摘要: Abstract In this work, the electrochemical behavior of a pyrite–carbon paste electrode in presence and absence Acidithiobacillus ferrooxidans was investigated by impedance spectroscopy (EIS) conjunction with X-ray photoelectron (XPS). The EIS responses varied over time both inoculated sterile solution, suggesting change kinetic processes at pyrite-solution interface during leaching process. pyrite oxidation rate initially controlled iron moiety dissolution systems without bacteria, formation intermediate products such as elemental sulfur polysulfide surface pyrite. these could further be oxidized to SO 4 2 - . However, S solution undetectable measurement. These results were also confirmed XPS measurements, which showed that microorganisms able remove from surface.
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