Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorBevilaqua, Denise
dc.creatorDiéz-Perez, Ismael
dc.creatorFugivara, Cecilio Sadao
dc.creatorSanz, Fausto
dc.creatorGarcia Júnior, Oswaldo
dc.creatorBenedetti, Assis Vicente
dc.date2014-05-27T11:20:55Z
dc.date2016-10-25T18:18:57Z
dc.date2014-05-27T11:20:55Z
dc.date2016-10-25T18:18:57Z
dc.date2003-10-02
dc.date.accessioned2017-04-06T01:06:50Z
dc.date.available2017-04-06T01:06:50Z
dc.identifierJournal of the Brazilian Chemical Society, v. 14, n. 4, p. 637-644, 2003.
dc.identifier0103-5053
dc.identifierhttp://hdl.handle.net/11449/67441
dc.identifierhttp://acervodigital.unesp.br/handle/11449/67441
dc.identifier10.1590/S0103-50532003000400022
dc.identifierS0103-50532003000400022
dc.identifierWOS:000184902600022
dc.identifier2-s2.0-0141606035.pdf
dc.identifier2-s2.0-0141606035
dc.identifierhttp://dx.doi.org/10.1590/S0103-50532003000400022
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/888886
dc.descriptionBornite electrodes were characterized in the absence or in the presence of Acidithiobacillus ferrooxidans, which is an important microorganism involved in metal bioleaching processes. The presence of the bacterium modified the mineral/electrolyte interface, increasing the corrosion rate, as revealed by interferometric, AEM, ICP and EIS analyses. As a consequence of bacterial activity the electrode became porous, increasing its surface heterogeneity. This behavior was correlated with the evolution of impedance diagrams obtained during the time course of experiments. The main difference in these diagrams was the presence of an inductive feature (up to 44 h), which was related to bacterial action on the mineral dissolution, better than to its adhesion on the bornite. The total real impedance measured in presence of the bacterium was about 10 times lower than in its absence, due to the acceleration of the mineral dissolution, because an oxidant environment was maintained.
dc.languageeng
dc.relationJournal of the Brazilian Chemical Society
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAcidithiobacillus ferrooxidans
dc.subjectBornite
dc.subjectElectrochemical impedance spectroscopy (EIS)
dc.subjectbornite
dc.subjectcopper derivative
dc.subjectelectrolyte
dc.subjectiron
dc.subjectmetal
dc.subjectmineral
dc.subjectsulfur
dc.subjectunclassified drug
dc.subjectbacterium
dc.subjectbioleaching
dc.subjectcell heterogeneity
dc.subjectchemical analysis
dc.subjectconference paper
dc.subjectcorrelation analysis
dc.subjectcorrosion
dc.subjectelectrode
dc.subjectexperiment
dc.subjectmicrobial activity
dc.subjectmicroorganism
dc.subjectporosity
dc.titleCharacterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
dc.typeOtro


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