Thermal and electrochemical studies of Fe(III) organophilic montmorillonite
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , |
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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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 |
|
_version_ |
1808128307219136512 |