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

Detalhes bibliográficos
Autor(a) principal: Bevilaqua, Denise [UNESP]
Data de Publicação: 2003
Outros Autores: Diéz-Perez, Ismael, Fugivara, Cecilio Sadao [UNESP], Sanz, Fausto, Garcia Júnior, Oswaldo[UNESP], Benedetti, Assis Vicente [UNESP]
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0103-50532003000400022
http://hdl.handle.net/11449/67441
Resumo: Bornite 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.
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spelling Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidansAcidithiobacillus ferrooxidansBorniteElectrochemical impedance spectroscopy (EIS)bornitecopper derivativeelectrolyteironmetalmineralsulfurunclassified drugbacteriumbioleachingcell heterogeneitychemical analysisconference papercorrelation analysiscorrosionelectrodeexperimentmicrobial activitymicroorganismporosityBornite 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.Instituto de Química Universidade Estadual Paulista, CP 355, 14801-970 Araraquara - SPCtr. Bioelectronics/Nanobioscience Department of Physical Chemistry University of Barcelona, Marti i Franqués 1, 08028, BarcelonaInstituto de Química Universidade Estadual Paulista, CP 355, 14801-970 Araraquara - SPUniversidade Estadual Paulista (Unesp)University of BarcelonaBevilaqua, Denise [UNESP]Diéz-Perez, IsmaelFugivara, Cecilio Sadao [UNESP]Sanz, FaustoGarcia Júnior, Oswaldo[UNESP]Benedetti, Assis Vicente [UNESP]2014-05-27T11:20:55Z2014-05-27T11:20:55Z2003-10-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject637-644application/pdfhttp://dx.doi.org/10.1590/S0103-50532003000400022Journal of the Brazilian Chemical Society, v. 14, n. 4, p. 637-644, 2003.0103-5053http://hdl.handle.net/11449/6744110.1590/S0103-50532003000400022S0103-50532003000400022WOS:0001849026000222-s2.0-01416060352-s2.0-0141606035.pdf2797127887030838Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Chemical Society1.4440,357info:eu-repo/semantics/openAccess2023-11-02T06:11:17Zoai:repositorio.unesp.br:11449/67441Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-02T06:11:17Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
title Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
spellingShingle Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
Bevilaqua, Denise [UNESP]
Acidithiobacillus ferrooxidans
Bornite
Electrochemical impedance spectroscopy (EIS)
bornite
copper derivative
electrolyte
iron
metal
mineral
sulfur
unclassified drug
bacterium
bioleaching
cell heterogeneity
chemical analysis
conference paper
correlation analysis
corrosion
electrode
experiment
microbial activity
microorganism
porosity
title_short Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
title_full Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
title_fullStr Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
title_full_unstemmed Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
title_sort Characterization of bornite (Cu5FeS4) electrodes in the presence of the bacterium Acidithiobacillus ferrooxidans
author Bevilaqua, Denise [UNESP]
author_facet Bevilaqua, Denise [UNESP]
Diéz-Perez, Ismael
Fugivara, Cecilio Sadao [UNESP]
Sanz, Fausto
Garcia Júnior, Oswaldo[UNESP]
Benedetti, Assis Vicente [UNESP]
author_role author
author2 Diéz-Perez, Ismael
Fugivara, Cecilio Sadao [UNESP]
Sanz, Fausto
Garcia Júnior, Oswaldo[UNESP]
Benedetti, Assis Vicente [UNESP]
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
University of Barcelona
dc.contributor.author.fl_str_mv Bevilaqua, Denise [UNESP]
Diéz-Perez, Ismael
Fugivara, Cecilio Sadao [UNESP]
Sanz, Fausto
Garcia Júnior, Oswaldo[UNESP]
Benedetti, Assis Vicente [UNESP]
dc.subject.por.fl_str_mv Acidithiobacillus ferrooxidans
Bornite
Electrochemical impedance spectroscopy (EIS)
bornite
copper derivative
electrolyte
iron
metal
mineral
sulfur
unclassified drug
bacterium
bioleaching
cell heterogeneity
chemical analysis
conference paper
correlation analysis
corrosion
electrode
experiment
microbial activity
microorganism
porosity
topic Acidithiobacillus ferrooxidans
Bornite
Electrochemical impedance spectroscopy (EIS)
bornite
copper derivative
electrolyte
iron
metal
mineral
sulfur
unclassified drug
bacterium
bioleaching
cell heterogeneity
chemical analysis
conference paper
correlation analysis
corrosion
electrode
experiment
microbial activity
microorganism
porosity
description Bornite 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.
publishDate 2003
dc.date.none.fl_str_mv 2003-10-02
2014-05-27T11:20:55Z
2014-05-27T11:20:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
format conferenceObject
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S0103-50532003000400022
Journal of the Brazilian Chemical Society, v. 14, n. 4, p. 637-644, 2003.
0103-5053
http://hdl.handle.net/11449/67441
10.1590/S0103-50532003000400022
S0103-50532003000400022
WOS:000184902600022
2-s2.0-0141606035
2-s2.0-0141606035.pdf
2797127887030838
url http://dx.doi.org/10.1590/S0103-50532003000400022
http://hdl.handle.net/11449/67441
identifier_str_mv Journal of the Brazilian Chemical Society, v. 14, n. 4, p. 637-644, 2003.
0103-5053
10.1590/S0103-50532003000400022
S0103-50532003000400022
WOS:000184902600022
2-s2.0-0141606035
2-s2.0-0141606035.pdf
2797127887030838
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of the Brazilian Chemical Society
1.444
0,357
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 637-644
application/pdf
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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