Trained to corrode: Cultivation in the presence of Fe(III) increases the electrochemical activity of iron reducing bacteria – An in situ electrochemical XANES study
| Autor: | Jan David Schutter, Dirk Lützenkirchen-Hecht, Nina Wurzler, Ozlem Ozcan, Matthias Dimper, Ralph Wagner |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
02 engineering and technology
Shewanella putrefaciens 010402 general chemistry Electrochemistry 01 natural sciences Chloride Corrosion lcsh:Chemistry chemistry.chemical_compound Iron bacteria medicine Dissolution biology 021001 nanoscience & nanotechnology biology.organism_classification XANES 0104 chemical sciences chemistry lcsh:Industrial electrochemistry lcsh:QD1-999 Hydroxide 0210 nano-technology medicine.drug Nuclear chemistry lcsh:TP250-261 |
| Zdroj: | Electrochemistry Communications, Vol 112, Iss, Pp-(2020) |
| ISSN: | 1388-2481 |
| Popis: | This paper reports results from in situ electrochemical X-ray absorption near-edge spectroscopy (XANES) studies of the corrosion processes on model thin iron films in the presence of iron reducing bacteria Shewanella putrefaciens. Here we investigate the electrochemical activity of two cultures grown in the presence and absence of Fe(III) citrate in the culture medium. The XANES spectra and the OCP data of the Fe sample incubated with the culture grown in absence of Fe(III) did not show any significant changes during twenty hours of monitoring. In the case of the culture grown in Fe(III) containing medium, an accelerated dissolution of the iron film was observed together with the formation of a mixed Fe(II)-Fe(III) hydroxide surface layer. The open circuit potential (OCP) steadily approached the free corrosion potential of iron in neutral chloride containing electrolytes, indicating a continuous dissolution process without passivation. Keywords: Microbiologically influenced corrosion, MIC, XANES, In situ electrochemical XANES, Iron reducing bacteria, Shewacnella putrefaciens CN32 |
| Databáze: | OpenAIRE |
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