Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water

Autores
Freitas, Victor A. A.; Maia, Laura A.; Belardinelli, Rolando Elio; Ardisson, Jose D.; Pereira, Márcio C.; Oliveira, Luiz C. A.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fe2O3-SiO2 composites were prepared by impregnation (sample FeIMP) or doping (sample FeDOP) in the structure of porous silica. The dye removal capacity of the materials was investigated through adsorption and oxidation studies of methylene blue and rhodamine B. N2 adsorption/desorption measurements on FeIMP and FeDOP resulted in specific areas of 27 and 235 m2 g−1, respectively. Mössbauer spectroscopy and XRD data detected hematite and maghemite as the iron phases in the samples FeIMP and FeDOP, respectively. Adsorption isotherms and kinetic studies of the dyes were better fitted in DKR model for FeDOP, where the process follows a pseudo-second order with the interparticle diffusion step being the rate-limiting step. On the other hand, FeIMP has better fit in the Langmuir model. Photocatalytic activity was observed in FeDOP under UV irradiation by the presence of reaction-hydroxylated intermediates for MB (m/z = 301) and RhB (m/z = 459). However, the photocatalytic activity was strongly influenced by the adsorption affinity between dye/catalyst. Photogenerated holes are the species responsible for the dye degradation when the adsorption is too strong, while hydroxyl radical action will be favored when the adsorption is not vigorous as detected by ESI-MS.
Fil: Freitas, Victor A. A.. Universidade Federal de Minas Gerais; Brasil
Fil: Maia, Laura A.. Universidade Federal de Minas Gerais; Brasil
Fil: Belardinelli, Rolando Elio. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada ; Argentina
Fil: Ardisson, Jose D.. Centro de Desenvolvimento da Tecnologia Nuclear; Brasil
Fil: Pereira, Márcio C.. Universidade Federal dos Vales do Jequitinhonha e Mucuri; Brasil
Fil: Oliveira, Luiz C. A.. Universidade Federal de Minas Gerais; Brasil
Materia
Adsorption
Dkr
Iron Oxide
Kinetic
Photocatalysis
Photogenerated Species
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:11336/60564
Acceder
id CONICETDig_8e64251736a3106f5ccae0244d2676c3
oai_identifier_str oai:ri.conicet.gov.ar:11336/60564
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in waterFreitas, Victor A. A.Maia, Laura A.Belardinelli, Rolando ElioArdisson, Jose D.Pereira, Márcio C.Oliveira, Luiz C. A.AdsorptionDkrIron OxideKineticPhotocatalysisPhotogenerated Specieshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Fe2O3-SiO2 composites were prepared by impregnation (sample FeIMP) or doping (sample FeDOP) in the structure of porous silica. The dye removal capacity of the materials was investigated through adsorption and oxidation studies of methylene blue and rhodamine B. N2 adsorption/desorption measurements on FeIMP and FeDOP resulted in specific areas of 27 and 235 m2 g−1, respectively. Mössbauer spectroscopy and XRD data detected hematite and maghemite as the iron phases in the samples FeIMP and FeDOP, respectively. Adsorption isotherms and kinetic studies of the dyes were better fitted in DKR model for FeDOP, where the process follows a pseudo-second order with the interparticle diffusion step being the rate-limiting step. On the other hand, FeIMP has better fit in the Langmuir model. Photocatalytic activity was observed in FeDOP under UV irradiation by the presence of reaction-hydroxylated intermediates for MB (m/z = 301) and RhB (m/z = 459). However, the photocatalytic activity was strongly influenced by the adsorption affinity between dye/catalyst. Photogenerated holes are the species responsible for the dye degradation when the adsorption is too strong, while hydroxyl radical action will be favored when the adsorption is not vigorous as detected by ESI-MS.Fil: Freitas, Victor A. A.. Universidade Federal de Minas Gerais; BrasilFil: Maia, Laura A.. Universidade Federal de Minas Gerais; BrasilFil: Belardinelli, Rolando Elio. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada ; ArgentinaFil: Ardisson, Jose D.. Centro de Desenvolvimento da Tecnologia Nuclear; BrasilFil: Pereira, Márcio C.. Universidade Federal dos Vales do Jequitinhonha e Mucuri; BrasilFil: Oliveira, Luiz C. A.. Universidade Federal de Minas Gerais; BrasilSpringer Heidelberg2017-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/60564Freitas, Victor A. A.; Maia, Laura A.; Belardinelli, Rolando Elio; Ardisson, Jose D.; Pereira, Márcio C.; et al.; Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water; Springer Heidelberg; Environmental Science and Pollution Research; 24; 7; 3-2017; 6114-61250944-13441614-7499CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s11356-016-6495-6info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs11356-016-6495-6info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:39:19Zoai:ri.conicet.gov.ar:11336/60564instacron: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:34982025-09-29 09:39:20.135CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
title Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
spellingShingle Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
Freitas, Victor A. A.
Adsorption
Dkr
Iron Oxide
Kinetic
Photocatalysis
Photogenerated Species
title_short Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
title_full Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
title_fullStr Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
title_full_unstemmed Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
title_sort Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water
dc.creator.none.fl_str_mv Freitas, Victor A. A.
Maia, Laura A.
Belardinelli, Rolando Elio
Ardisson, Jose D.
Pereira, Márcio C.
Oliveira, Luiz C. A.
author Freitas, Victor A. A.
author_facet Freitas, Victor A. A.
Maia, Laura A.
Belardinelli, Rolando Elio
Ardisson, Jose D.
Pereira, Márcio C.
Oliveira, Luiz C. A.
author_role author
author2 Maia, Laura A.
Belardinelli, Rolando Elio
Ardisson, Jose D.
Pereira, Márcio C.
Oliveira, Luiz C. A.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Adsorption
Dkr
Iron Oxide
Kinetic
Photocatalysis
Photogenerated Species
topic Adsorption
Dkr
Iron Oxide
Kinetic
Photocatalysis
Photogenerated Species
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Fe2O3-SiO2 composites were prepared by impregnation (sample FeIMP) or doping (sample FeDOP) in the structure of porous silica. The dye removal capacity of the materials was investigated through adsorption and oxidation studies of methylene blue and rhodamine B. N2 adsorption/desorption measurements on FeIMP and FeDOP resulted in specific areas of 27 and 235 m2 g−1, respectively. Mössbauer spectroscopy and XRD data detected hematite and maghemite as the iron phases in the samples FeIMP and FeDOP, respectively. Adsorption isotherms and kinetic studies of the dyes were better fitted in DKR model for FeDOP, where the process follows a pseudo-second order with the interparticle diffusion step being the rate-limiting step. On the other hand, FeIMP has better fit in the Langmuir model. Photocatalytic activity was observed in FeDOP under UV irradiation by the presence of reaction-hydroxylated intermediates for MB (m/z = 301) and RhB (m/z = 459). However, the photocatalytic activity was strongly influenced by the adsorption affinity between dye/catalyst. Photogenerated holes are the species responsible for the dye degradation when the adsorption is too strong, while hydroxyl radical action will be favored when the adsorption is not vigorous as detected by ESI-MS.
Fil: Freitas, Victor A. A.. Universidade Federal de Minas Gerais; Brasil
Fil: Maia, Laura A.. Universidade Federal de Minas Gerais; Brasil
Fil: Belardinelli, Rolando Elio. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Física Aplicada ; Argentina
Fil: Ardisson, Jose D.. Centro de Desenvolvimento da Tecnologia Nuclear; Brasil
Fil: Pereira, Márcio C.. Universidade Federal dos Vales do Jequitinhonha e Mucuri; Brasil
Fil: Oliveira, Luiz C. A.. Universidade Federal de Minas Gerais; Brasil
description Fe2O3-SiO2 composites were prepared by impregnation (sample FeIMP) or doping (sample FeDOP) in the structure of porous silica. The dye removal capacity of the materials was investigated through adsorption and oxidation studies of methylene blue and rhodamine B. N2 adsorption/desorption measurements on FeIMP and FeDOP resulted in specific areas of 27 and 235 m2 g−1, respectively. Mössbauer spectroscopy and XRD data detected hematite and maghemite as the iron phases in the samples FeIMP and FeDOP, respectively. Adsorption isotherms and kinetic studies of the dyes were better fitted in DKR model for FeDOP, where the process follows a pseudo-second order with the interparticle diffusion step being the rate-limiting step. On the other hand, FeIMP has better fit in the Langmuir model. Photocatalytic activity was observed in FeDOP under UV irradiation by the presence of reaction-hydroxylated intermediates for MB (m/z = 301) and RhB (m/z = 459). However, the photocatalytic activity was strongly influenced by the adsorption affinity between dye/catalyst. Photogenerated holes are the species responsible for the dye degradation when the adsorption is too strong, while hydroxyl radical action will be favored when the adsorption is not vigorous as detected by ESI-MS.
publishDate 2017
dc.date.none.fl_str_mv 2017-03
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/11336/60564
Freitas, Victor A. A.; Maia, Laura A.; Belardinelli, Rolando Elio; Ardisson, Jose D.; Pereira, Márcio C.; et al.; Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water; Springer Heidelberg; Environmental Science and Pollution Research; 24; 7; 3-2017; 6114-6125
0944-1344
1614-7499
CONICET Digital
CONICET
url http://hdl.handle.net/11336/60564
identifier_str_mv Freitas, Victor A. A.; Maia, Laura A.; Belardinelli, Rolando Elio; Ardisson, Jose D.; Pereira, Márcio C.; et al.; Magnetic iron species highly dispersed over silica: use as catalysts for removal of pollutants in water; Springer Heidelberg; Environmental Science and Pollution Research; 24; 7; 3-2017; 6114-6125
0944-1344
1614-7499
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s11356-016-6495-6
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs11356-016-6495-6
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 Springer Heidelberg
publisher.none.fl_str_mv Springer Heidelberg
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 13.070432

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