Thermal and electrochemical studies of Fe(III) organophilic montmorillonite

Detalhes bibliográficos
Autor(a) principal: Franzin, Bruno Trevizan [UNESP]
Data de Publicação: 2018
Outros Autores: Lupi, Caroline Polini [UNESP], Martins, Lucas Alves [UNESP], Guizellini, Filipe Corrêa, dos Santos, Cecília Cristina Marques [UNESP], Pastre, Iêda Aparecida [UNESP], Fertonani, Fernando Luis [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1007/s10973-017-6327-z
http://hdl.handle.net/11449/174420
Resumo: This study aimed at investigating the thermal and electrochemical behavior of montmorillonite clay-8-hydroxyquinoline (8-HQ) film in the absence and presence of aqueous Fe(III) ions. The solid film characterization by means of UV spectroscopy, thermal (TG/DTG and TG–DTA, simultaneous) studies, SEM and optical images, and XRD suggested the formation of the ternary complex type: {Pt/[>Si–O]n[Fe(III)(OH2)3(8-HQ)k]}3−n−k, with thermal stability up to 300 °C. The electrochemical study was carried out on a platinum electrode modified by mechanical deposition of a thin solid film of the binary composite (SWy-1:8-HQ) from an aqueous suspension. The mechanical stability of the film was followed by performing 80 cyclic voltammograms. The electrochemical behavior of the modified electrode was investigated using cyclic voltammetry (CV) at different ferric ions concentration (CFe(III)), followed by a study of the effect of the scan rate (v) with a fixed CFe(III) ions. In the CVs, two independent pairs of current peaks, A/D and C/B, were observed. For Fe(III) ions in solution, log ip versus log v relationship shows a process controlled first by adsorption (pair of peaks A/D) and then by diffusion control (pair of peaks C/B). The current function ip/v1/2 versus v and ip a/ip c versus v allowed a suggestion of two homogeneous coupled chemical reactions associated with CE and EC mechanisms, respectively, both with fast reversible chemical reactions. The first investigation of a modified electrode showed good sensitivity (S = 25.1 μA/μmol L−1) to low concentrations of ferric ions and detection limit [LOD = (2.4 ± 0.01) μmol L−1] and high sensitivity to traces of O2, showing that this system has great analytical potentials.
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spelling Thermal and electrochemical studies of Fe(III) organophilic montmorilloniteDetermination of Fe(III) ionsElectrochemistryOrganic montmorillonitePt-modified electrodeTG–DTAXRDThis study aimed at investigating the thermal and electrochemical behavior of montmorillonite clay-8-hydroxyquinoline (8-HQ) film in the absence and presence of aqueous Fe(III) ions. The solid film characterization by means of UV spectroscopy, thermal (TG/DTG and TG–DTA, simultaneous) studies, SEM and optical images, and XRD suggested the formation of the ternary complex type: {Pt/[>Si–O]n[Fe(III)(OH2)3(8-HQ)k]}3−n−k, with thermal stability up to 300 °C. The electrochemical study was carried out on a platinum electrode modified by mechanical deposition of a thin solid film of the binary composite (SWy-1:8-HQ) from an aqueous suspension. The mechanical stability of the film was followed by performing 80 cyclic voltammograms. The electrochemical behavior of the modified electrode was investigated using cyclic voltammetry (CV) at different ferric ions concentration (CFe(III)), followed by a study of the effect of the scan rate (v) with a fixed CFe(III) ions. In the CVs, two independent pairs of current peaks, A/D and C/B, were observed. For Fe(III) ions in solution, log ip versus log v relationship shows a process controlled first by adsorption (pair of peaks A/D) and then by diffusion control (pair of peaks C/B). The current function ip/v1/2 versus v and ip a/ip c versus v allowed a suggestion of two homogeneous coupled chemical reactions associated with CE and EC mechanisms, respectively, both with fast reversible chemical reactions. The first investigation of a modified electrode showed good sensitivity (S = 25.1 μA/μmol L−1) to low concentrations of ferric ions and detection limit [LOD = (2.4 ± 0.01) μmol L−1] and high sensitivity to traces of O2, showing that this system has great analytical potentials.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Departamento de Química e Ciências Ambientais IBILCE/UnespDepartamento de Química Universidade Estadual de Londrina – UELInstituto Adolfo LutzDepartamento de Química e Ciências Ambientais IBILCE/UnespUniversidade Estadual Paulista (Unesp)Universidade Estadual de Londrina (UEL)Instituto Adolfo LutzFranzin, Bruno Trevizan [UNESP]Lupi, Caroline Polini [UNESP]Martins, Lucas Alves [UNESP]Guizellini, Filipe Corrêados Santos, Cecília Cristina Marques [UNESP]Pastre, Iêda Aparecida [UNESP]Fertonani, Fernando Luis [UNESP]2018-12-11T17:11:02Z2018-12-11T17:11:02Z2018-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article713-723application/pdfhttp://dx.doi.org/10.1007/s10973-017-6327-zJournal of Thermal Analysis and Calorimetry, v. 131, n. 1, p. 713-723, 2018.1588-29261388-6150http://hdl.handle.net/11449/17442010.1007/s10973-017-6327-z2-s2.0-850169356172-s2.0-85016935617.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Thermal Analysis and Calorimetry0,5870,587info:eu-repo/semantics/openAccess2023-10-05T06:01:53Zoai:repositorio.unesp.br:11449/174420Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:02:19.030624Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
title Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
spellingShingle Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
Franzin, Bruno Trevizan [UNESP]
Determination of Fe(III) ions
Electrochemistry
Organic montmorillonite
Pt-modified electrode
TG–DTA
XRD
title_short Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
title_full Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
title_fullStr Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
title_full_unstemmed Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
title_sort Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
author Franzin, Bruno Trevizan [UNESP]
author_facet Franzin, Bruno Trevizan [UNESP]
Lupi, Caroline Polini [UNESP]
Martins, Lucas Alves [UNESP]
Guizellini, Filipe Corrêa
dos Santos, Cecília Cristina Marques [UNESP]
Pastre, Iêda Aparecida [UNESP]
Fertonani, Fernando Luis [UNESP]
author_role author
author2 Lupi, Caroline Polini [UNESP]
Martins, Lucas Alves [UNESP]
Guizellini, Filipe Corrêa
dos Santos, Cecília Cristina Marques [UNESP]
Pastre, Iêda Aparecida [UNESP]
Fertonani, Fernando Luis [UNESP]
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade Estadual de Londrina (UEL)
Instituto Adolfo Lutz
dc.contributor.author.fl_str_mv Franzin, Bruno Trevizan [UNESP]
Lupi, Caroline Polini [UNESP]
Martins, Lucas Alves [UNESP]
Guizellini, Filipe Corrêa
dos Santos, Cecília Cristina Marques [UNESP]
Pastre, Iêda Aparecida [UNESP]
Fertonani, Fernando Luis [UNESP]
dc.subject.por.fl_str_mv Determination of Fe(III) ions
Electrochemistry
Organic montmorillonite
Pt-modified electrode
TG–DTA
XRD
topic Determination of Fe(III) ions
Electrochemistry
Organic montmorillonite
Pt-modified electrode
TG–DTA
XRD
description This study aimed at investigating the thermal and electrochemical behavior of montmorillonite clay-8-hydroxyquinoline (8-HQ) film in the absence and presence of aqueous Fe(III) ions. The solid film characterization by means of UV spectroscopy, thermal (TG/DTG and TG–DTA, simultaneous) studies, SEM and optical images, and XRD suggested the formation of the ternary complex type: {Pt/[>Si–O]n[Fe(III)(OH2)3(8-HQ)k]}3−n−k, with thermal stability up to 300 °C. The electrochemical study was carried out on a platinum electrode modified by mechanical deposition of a thin solid film of the binary composite (SWy-1:8-HQ) from an aqueous suspension. The mechanical stability of the film was followed by performing 80 cyclic voltammograms. The electrochemical behavior of the modified electrode was investigated using cyclic voltammetry (CV) at different ferric ions concentration (CFe(III)), followed by a study of the effect of the scan rate (v) with a fixed CFe(III) ions. In the CVs, two independent pairs of current peaks, A/D and C/B, were observed. For Fe(III) ions in solution, log ip versus log v relationship shows a process controlled first by adsorption (pair of peaks A/D) and then by diffusion control (pair of peaks C/B). The current function ip/v1/2 versus v and ip a/ip c versus v allowed a suggestion of two homogeneous coupled chemical reactions associated with CE and EC mechanisms, respectively, both with fast reversible chemical reactions. The first investigation of a modified electrode showed good sensitivity (S = 25.1 μA/μmol L−1) to low concentrations of ferric ions and detection limit [LOD = (2.4 ± 0.01) μmol L−1] and high sensitivity to traces of O2, showing that this system has great analytical potentials.
publishDate 2018
dc.date.none.fl_str_mv 2018-12-11T17:11:02Z
2018-12-11T17:11:02Z
2018-01-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1007/s10973-017-6327-z
Journal of Thermal Analysis and Calorimetry, v. 131, n. 1, p. 713-723, 2018.
1588-2926
1388-6150
http://hdl.handle.net/11449/174420
10.1007/s10973-017-6327-z
2-s2.0-85016935617
2-s2.0-85016935617.pdf
url http://dx.doi.org/10.1007/s10973-017-6327-z
http://hdl.handle.net/11449/174420
identifier_str_mv Journal of Thermal Analysis and Calorimetry, v. 131, n. 1, p. 713-723, 2018.
1588-2926
1388-6150
10.1007/s10973-017-6327-z
2-s2.0-85016935617
2-s2.0-85016935617.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Thermal Analysis and Calorimetry
0,587
0,587
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 713-723
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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