Biogenic Synthesis and Reduction of Fe(III)-hydroxysulfates
| Autor: | Jonathan P. Gramp, Olli H. Tuovinen, F. Sandy Jones, Hongmei Wang, Jerry M. Bigham |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Greigite Sulfide Chemistry Schwertmannite Inorganic chemistry Electron donor engineering.material Electron acceptor Microbiology chemistry.chemical_compound Jarosite Earth and Planetary Sciences (miscellaneous) engineering Environmental Chemistry Sulfate-reducing bacteria Sulfate General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 26:275-280 |
| ISSN: | 1521-0529 0149-0451 |
| DOI: | 10.1080/01490450902892597 |
| Popis: | The purpose of the study was to produce schwertmannite (ideally Fe8O8(OH)6(SO4)) and jarosite ((K, NH4, H3O)Fe3(SO4)2 (OH)6) through bacterial iron oxidation and use these Fe(III)-hydroxysulfates as electron acceptors for sulfate-reducing microorganisms. Iron-oxidizing microorganisms were used to oxidize soluble Fe(II) to Fe(III) at pH ∼2, resulting in precipitation of schwertmannite and jarosite. The precipitates were used as solid-phase electron acceptors for sulfate-reducing bacteria with lactate as the electron donor under mesophilic (22°C) and thermophilic (45 and 60°C) anaerobic conditions. Gypsum (CaSO4·2H2O) was also used as a reference electron acceptor because it is moderately soluble and previous studies had shown that the sulfate entity was reduced to sulfide by sulfate-reducing bacteria. The formation of greigite (Fe3S4) from schwertmannite was verified with X-ray diffraction after 2 weeks of incubation in the 60°C sulfate-reducing culture. Greigite was also identified in solids from media th... |
| Databáze: | OpenAIRE |
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