EIS studies of chalcopyrite involving iron(II) ions

Detalhes bibliográficos
Autor(a) principal: Delfino, Fabiana Antonia Arena [UNESP]
Data de Publicação: 2017
Outros Autores: Bevilaqua, Denise [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/10.4028/www.scientific.net/SSP.262.496
http://hdl.handle.net/11449/179155
Resumo: In this work, we present an Electrochemical Impedance Spectroscopy (EIS) study using a carbon paste electrode modified with chalcopyrite (CuFeS2) containing 50 wt% of the mineral (particle size < 38 μm) and graphite (particle size < 20 μm) in naturally aerated salt acid solutions (pH 1.8) without and with the addition of 0.100 mol L-1 of ferrous ions. The aim was to evaluate the influence of the solution potential on the behavior of chalcopyrite electrode in the presence and absence of iron(II) ions. Additionally, we evaluated the influence of the bacteria Acidithiobacillus ferrooxidans in the system containing iron(II) ions without applying potential. Therefore, EIS was used to investigate the processes occurring at the electrode/solution interface in the different systems, considering the charge transfer reactions involving chalcopyrite and ferrous ions, the presence of a multicomponent layer, and diffusion. The results showed that the combination of iron(II) ions with the imposition of low potential values (0.100 Fe2+ ions with +0.300 V/Ag|AgCl|KCl3mol/L) activates the chalcopyrite surface and enhances the copper recovery.
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spelling EIS studies of chalcopyrite involving iron(II) ionsBioleachingChalcopyriteElectrochemical impedance spectroscopyRedox potentialIn this work, we present an Electrochemical Impedance Spectroscopy (EIS) study using a carbon paste electrode modified with chalcopyrite (CuFeS2) containing 50 wt% of the mineral (particle size < 38 μm) and graphite (particle size < 20 μm) in naturally aerated salt acid solutions (pH 1.8) without and with the addition of 0.100 mol L-1 of ferrous ions. The aim was to evaluate the influence of the solution potential on the behavior of chalcopyrite electrode in the presence and absence of iron(II) ions. Additionally, we evaluated the influence of the bacteria Acidithiobacillus ferrooxidans in the system containing iron(II) ions without applying potential. Therefore, EIS was used to investigate the processes occurring at the electrode/solution interface in the different systems, considering the charge transfer reactions involving chalcopyrite and ferrous ions, the presence of a multicomponent layer, and diffusion. The results showed that the combination of iron(II) ions with the imposition of low potential values (0.100 Fe2+ ions with +0.300 V/Ag|AgCl|KCl3mol/L) activates the chalcopyrite surface and enhances the copper recovery.São Paulo State University UNESP Institute of Chemistry, Post Box 355São Paulo State University UNESP Institute of Chemistry, Post Box 355Universidade Estadual Paulista (Unesp)Delfino, Fabiana Antonia Arena [UNESP]Bevilaqua, Denise [UNESP]Benedetti, Assis Vicente [UNESP]2018-12-11T17:33:58Z2018-12-11T17:33:58Z2017-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject496-500http://dx.doi.org/10.4028/www.scientific.net/SSP.262.496Solid State Phenomena, v. 262 SSP, p. 496-500.1662-9779http://hdl.handle.net/11449/17915510.4028/www.scientific.net/SSP.262.4962-s2.0-85028976794Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSolid State Phenomena0,156info:eu-repo/semantics/openAccess2021-10-23T12:31:13Zoai:repositorio.unesp.br:11449/179155Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T12:31:13Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv EIS studies of chalcopyrite involving iron(II) ions
title EIS studies of chalcopyrite involving iron(II) ions
spellingShingle EIS studies of chalcopyrite involving iron(II) ions
Delfino, Fabiana Antonia Arena [UNESP]
Bioleaching
Chalcopyrite
Electrochemical impedance spectroscopy
Redox potential
title_short EIS studies of chalcopyrite involving iron(II) ions
title_full EIS studies of chalcopyrite involving iron(II) ions
title_fullStr EIS studies of chalcopyrite involving iron(II) ions
title_full_unstemmed EIS studies of chalcopyrite involving iron(II) ions
title_sort EIS studies of chalcopyrite involving iron(II) ions
author Delfino, Fabiana Antonia Arena [UNESP]
author_facet Delfino, Fabiana Antonia Arena [UNESP]
Bevilaqua, Denise [UNESP]
Benedetti, Assis Vicente [UNESP]
author_role author
author2 Bevilaqua, Denise [UNESP]
Benedetti, Assis Vicente [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Delfino, Fabiana Antonia Arena [UNESP]
Bevilaqua, Denise [UNESP]
Benedetti, Assis Vicente [UNESP]
dc.subject.por.fl_str_mv Bioleaching
Chalcopyrite
Electrochemical impedance spectroscopy
Redox potential
topic Bioleaching
Chalcopyrite
Electrochemical impedance spectroscopy
Redox potential
description In this work, we present an Electrochemical Impedance Spectroscopy (EIS) study using a carbon paste electrode modified with chalcopyrite (CuFeS2) containing 50 wt% of the mineral (particle size < 38 μm) and graphite (particle size < 20 μm) in naturally aerated salt acid solutions (pH 1.8) without and with the addition of 0.100 mol L-1 of ferrous ions. The aim was to evaluate the influence of the solution potential on the behavior of chalcopyrite electrode in the presence and absence of iron(II) ions. Additionally, we evaluated the influence of the bacteria Acidithiobacillus ferrooxidans in the system containing iron(II) ions without applying potential. Therefore, EIS was used to investigate the processes occurring at the electrode/solution interface in the different systems, considering the charge transfer reactions involving chalcopyrite and ferrous ions, the presence of a multicomponent layer, and diffusion. The results showed that the combination of iron(II) ions with the imposition of low potential values (0.100 Fe2+ ions with +0.300 V/Ag|AgCl|KCl3mol/L) activates the chalcopyrite surface and enhances the copper recovery.
publishDate 2017
dc.date.none.fl_str_mv 2017-01-01
2018-12-11T17:33:58Z
2018-12-11T17:33:58Z
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/10.4028/www.scientific.net/SSP.262.496
Solid State Phenomena, v. 262 SSP, p. 496-500.
1662-9779
http://hdl.handle.net/11449/179155
10.4028/www.scientific.net/SSP.262.496
2-s2.0-85028976794
url http://dx.doi.org/10.4028/www.scientific.net/SSP.262.496
http://hdl.handle.net/11449/179155
identifier_str_mv Solid State Phenomena, v. 262 SSP, p. 496-500.
1662-9779
10.4028/www.scientific.net/SSP.262.496
2-s2.0-85028976794
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Solid State Phenomena
0,156
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 496-500
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
_version_ 1799965268778156032

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