Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate

Autores
Cabrera, Alejandra Fabiana; RodrÍguez Torres, Claudia Elena; Stewart, Silvana Jacqueline
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Nanostructured aluminium-doped magnetic iron (III) oxide (AlxFe2-xO3 with x= 0.33, 0.67 and 1) have been prepared by autocombustion method. The as-prepared samples were characterized by XRD, thermogravimetric analysis, UV-vis and Mössbauer spectroscopies and magnetometry. The cubic spinel is the main crystalline phase for all compositions. The presence of Al in the spinel phase causes a progressive decrease in both the cell parameter (a) and the grain size (L). The room temperature Mössbauer spectrum of x= 0.33 is mainly composed of a Fe3+ broad sextet while, for higher Al content, the spectra consist of a Fe3+ broad doublet corresponding to superparamagnetic maghemite. The saturation magnetization decreases with the Al doping and reaches a rather low value for the illcrystalline sample x = 1 (MS ~ 2 emu/g). The optical direct band gap of the samples is red-shifted with respect to pure maghemite, with values close to 2 eV. The photocatalytic performance of AlxFe2-xO3 tested in the decolorization of methylene blue dye showed a good efficiency for the oxide whose band gap energy best matches the energy of the incident light (x= 0.33). The catalytic effect of these samples on the thermal decomposition of ammonium nitrate is more noticeable for those Al concentrations that lead to the reaction being exothermic.
Fil: Cabrera, Alejandra Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: RodrÍguez Torres, Claudia Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Stewart, Silvana Jacqueline. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Materia
MAGHEMITE
AL-DOPED MAGHEMITE
PHOTOCATALYSIS
AMONIUM NITRATE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/246230
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/246230
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrateCabrera, Alejandra FabianaRodrÍguez Torres, Claudia ElenaStewart, Silvana JacquelineMAGHEMITEAL-DOPED MAGHEMITEPHOTOCATALYSISAMONIUM NITRATEhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Nanostructured aluminium-doped magnetic iron (III) oxide (AlxFe2-xO3 with x= 0.33, 0.67 and 1) have been prepared by autocombustion method. The as-prepared samples were characterized by XRD, thermogravimetric analysis, UV-vis and Mössbauer spectroscopies and magnetometry. The cubic spinel is the main crystalline phase for all compositions. The presence of Al in the spinel phase causes a progressive decrease in both the cell parameter (a) and the grain size (L). The room temperature Mössbauer spectrum of x= 0.33 is mainly composed of a Fe3+ broad sextet while, for higher Al content, the spectra consist of a Fe3+ broad doublet corresponding to superparamagnetic maghemite. The saturation magnetization decreases with the Al doping and reaches a rather low value for the illcrystalline sample x = 1 (MS ~ 2 emu/g). The optical direct band gap of the samples is red-shifted with respect to pure maghemite, with values close to 2 eV. The photocatalytic performance of AlxFe2-xO3 tested in the decolorization of methylene blue dye showed a good efficiency for the oxide whose band gap energy best matches the energy of the incident light (x= 0.33). The catalytic effect of these samples on the thermal decomposition of ammonium nitrate is more noticeable for those Al concentrations that lead to the reaction being exothermic.Fil: Cabrera, Alejandra Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: RodrÍguez Torres, Claudia Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Stewart, Silvana Jacqueline. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaElsevier2023-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/246230Cabrera, Alejandra Fabiana; RodrÍguez Torres, Claudia Elena; Stewart, Silvana Jacqueline; Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate; Elsevier; Social Science Research Network; 5-2023; 1-211556-5068CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.2139/ssrn.4272401info:eu-repo/semantics/altIdentifier/url/https://ssrn.com/abstract=4272401info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:08:04Zoai:ri.conicet.gov.ar:11336/246230instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 15:08:04.44CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
title Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
spellingShingle Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
Cabrera, Alejandra Fabiana
MAGHEMITE
AL-DOPED MAGHEMITE
PHOTOCATALYSIS
AMONIUM NITRATE
title_short Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
title_full Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
title_fullStr Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
title_full_unstemmed Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
title_sort Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate
dc.creator.none.fl_str_mv Cabrera, Alejandra Fabiana
RodrÍguez Torres, Claudia Elena
Stewart, Silvana Jacqueline
author Cabrera, Alejandra Fabiana
author_facet Cabrera, Alejandra Fabiana
RodrÍguez Torres, Claudia Elena
Stewart, Silvana Jacqueline
author_role author
author2 RodrÍguez Torres, Claudia Elena
Stewart, Silvana Jacqueline
author2_role author
author
dc.subject.none.fl_str_mv MAGHEMITE
AL-DOPED MAGHEMITE
PHOTOCATALYSIS
AMONIUM NITRATE
topic MAGHEMITE
AL-DOPED MAGHEMITE
PHOTOCATALYSIS
AMONIUM NITRATE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Nanostructured aluminium-doped magnetic iron (III) oxide (AlxFe2-xO3 with x= 0.33, 0.67 and 1) have been prepared by autocombustion method. The as-prepared samples were characterized by XRD, thermogravimetric analysis, UV-vis and Mössbauer spectroscopies and magnetometry. The cubic spinel is the main crystalline phase for all compositions. The presence of Al in the spinel phase causes a progressive decrease in both the cell parameter (a) and the grain size (L). The room temperature Mössbauer spectrum of x= 0.33 is mainly composed of a Fe3+ broad sextet while, for higher Al content, the spectra consist of a Fe3+ broad doublet corresponding to superparamagnetic maghemite. The saturation magnetization decreases with the Al doping and reaches a rather low value for the illcrystalline sample x = 1 (MS ~ 2 emu/g). The optical direct band gap of the samples is red-shifted with respect to pure maghemite, with values close to 2 eV. The photocatalytic performance of AlxFe2-xO3 tested in the decolorization of methylene blue dye showed a good efficiency for the oxide whose band gap energy best matches the energy of the incident light (x= 0.33). The catalytic effect of these samples on the thermal decomposition of ammonium nitrate is more noticeable for those Al concentrations that lead to the reaction being exothermic.
Fil: Cabrera, Alejandra Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: RodrÍguez Torres, Claudia Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Stewart, Silvana Jacqueline. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
description Nanostructured aluminium-doped magnetic iron (III) oxide (AlxFe2-xO3 with x= 0.33, 0.67 and 1) have been prepared by autocombustion method. The as-prepared samples were characterized by XRD, thermogravimetric analysis, UV-vis and Mössbauer spectroscopies and magnetometry. The cubic spinel is the main crystalline phase for all compositions. The presence of Al in the spinel phase causes a progressive decrease in both the cell parameter (a) and the grain size (L). The room temperature Mössbauer spectrum of x= 0.33 is mainly composed of a Fe3+ broad sextet while, for higher Al content, the spectra consist of a Fe3+ broad doublet corresponding to superparamagnetic maghemite. The saturation magnetization decreases with the Al doping and reaches a rather low value for the illcrystalline sample x = 1 (MS ~ 2 emu/g). The optical direct band gap of the samples is red-shifted with respect to pure maghemite, with values close to 2 eV. The photocatalytic performance of AlxFe2-xO3 tested in the decolorization of methylene blue dye showed a good efficiency for the oxide whose band gap energy best matches the energy of the incident light (x= 0.33). The catalytic effect of these samples on the thermal decomposition of ammonium nitrate is more noticeable for those Al concentrations that lead to the reaction being exothermic.
publishDate 2023
dc.date.none.fl_str_mv 2023-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/246230
Cabrera, Alejandra Fabiana; RodrÍguez Torres, Claudia Elena; Stewart, Silvana Jacqueline; Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate; Elsevier; Social Science Research Network; 5-2023; 1-21
1556-5068
CONICET Digital
CONICET
url http://hdl.handle.net/11336/246230
identifier_str_mv Cabrera, Alejandra Fabiana; RodrÍguez Torres, Claudia Elena; Stewart, Silvana Jacqueline; Al-doped maghemite examined as catalyst for the discoloration of methylene blue and for the decomposition of ammonium nitrate; Elsevier; Social Science Research Network; 5-2023; 1-21
1556-5068
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.2139/ssrn.4272401
info:eu-repo/semantics/altIdentifier/url/https://ssrn.com/abstract=4272401
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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