Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture

Autores
Rodríguez Castellón, Enrique; Ballesteros Plata, Daniel; Fellenz, Nicolás Antonio
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Two Nitrogen-modified mesoporous MCM-41 type silicas were synthesized by the sol-gel route andpost-grafting surface modification procedure, obtaining an aminopropyl-modified MCM-41(denoted MCM-41-N) and an aminoethyl-aminopropyl-modified MCM-41 (denoted MCM-41-NN).Hexavalent chromium removal from acidified water by adsorption and reduction to Cr(III) on thesolid mesophases was analyzed. The modified silicas were characterized by powder X-raydiffraction, infrared spectroscopy, nitrogen adsorption-desorption measurements at -196 °C, X-rayphotoelectron spectroscopy, 29Si solid state Nuclear Magnetic Resonance, and thermogravimetricanalysis. Both samples exhibited very high capacities for decreasing Cr(VI) concentrations in water,according to the Langmuir isotherm model: 129.9 mg·g-1 for MCM-41-N and 133.3 mg·g-1for MCM-41-NN. The chromium speciation in the supernatant after 24 h indicates that MCM-41-N had a higher capacity to reduce Cr(VI) to the less toxic Cr(III) species than MCM-41-NN: 92.9 % vs 72.5 % when the initial Cr(VI) concentration was 10 ppm. These differences were related to the different capacity of nitrogen atoms in MCM-41-N and MCM-41-NN to interact with the surrounding surface silanolswhich are required for the chemical reduction of the hexavalent species to take place, as evidencedby infrared spectroscopy and X-ray photoelectron spectroscopy analysis. Also, the Cr(III)/Cr(VI)atomic ratios on the solid’s surfaces were higher for MCM-41-N. These results highlight thecharacteristics that nitrogen atoms incorporated to silica matrices must possess in order to maximizethe transformation of Cr(VI) into the trivalent species, thereby reducing the generation of toxic wasteharmful to living organisms.
Fil: Rodríguez Castellón, Enrique. Universidad de Málaga; España
Fil: Ballesteros Plata, Daniel. Universidad de Málaga; España
Fil: Fellenz, Nicolás Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Materia
HEXAVALENT CHROMIUM
ADSORPTION
REDUCTION
NITROGEN-DOPED
MCM-41
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/270759
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/270759
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group ArchitectureRodríguez Castellón, EnriqueBallesteros Plata, DanielFellenz, Nicolás AntonioHEXAVALENT CHROMIUMADSORPTIONREDUCTIONNITROGEN-DOPEDMCM-41https://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2Two Nitrogen-modified mesoporous MCM-41 type silicas were synthesized by the sol-gel route andpost-grafting surface modification procedure, obtaining an aminopropyl-modified MCM-41(denoted MCM-41-N) and an aminoethyl-aminopropyl-modified MCM-41 (denoted MCM-41-NN).Hexavalent chromium removal from acidified water by adsorption and reduction to Cr(III) on thesolid mesophases was analyzed. The modified silicas were characterized by powder X-raydiffraction, infrared spectroscopy, nitrogen adsorption-desorption measurements at -196 °C, X-rayphotoelectron spectroscopy, 29Si solid state Nuclear Magnetic Resonance, and thermogravimetricanalysis. Both samples exhibited very high capacities for decreasing Cr(VI) concentrations in water,according to the Langmuir isotherm model: 129.9 mg·g-1 for MCM-41-N and 133.3 mg·g-1for MCM-41-NN. The chromium speciation in the supernatant after 24 h indicates that MCM-41-N had a higher capacity to reduce Cr(VI) to the less toxic Cr(III) species than MCM-41-NN: 92.9 % vs 72.5 % when the initial Cr(VI) concentration was 10 ppm. These differences were related to the different capacity of nitrogen atoms in MCM-41-N and MCM-41-NN to interact with the surrounding surface silanolswhich are required for the chemical reduction of the hexavalent species to take place, as evidencedby infrared spectroscopy and X-ray photoelectron spectroscopy analysis. Also, the Cr(III)/Cr(VI)atomic ratios on the solid’s surfaces were higher for MCM-41-N. These results highlight thecharacteristics that nitrogen atoms incorporated to silica matrices must possess in order to maximizethe transformation of Cr(VI) into the trivalent species, thereby reducing the generation of toxic wasteharmful to living organisms.Fil: Rodríguez Castellón, Enrique. Universidad de Málaga; EspañaFil: Ballesteros Plata, Daniel. Universidad de Málaga; EspañaFil: Fellenz, Nicolás Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaMDPI2025-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/270759Rodríguez Castellón, Enrique; Ballesteros Plata, Daniel; Fellenz, Nicolás Antonio; Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture; MDPI; Applied Sciences; 15; 17; 8-2025; 1-182076-3417CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3390/app15179370info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:08:02Zoai:ri.conicet.gov.ar:11336/270759instacron: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 15:08:02.35CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
title Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
spellingShingle Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
Rodríguez Castellón, Enrique
HEXAVALENT CHROMIUM
ADSORPTION
REDUCTION
NITROGEN-DOPED
MCM-41
title_short Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
title_full Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
title_fullStr Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
title_full_unstemmed Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
title_sort Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture
dc.creator.none.fl_str_mv Rodríguez Castellón, Enrique
Ballesteros Plata, Daniel
Fellenz, Nicolás Antonio
author Rodríguez Castellón, Enrique
author_facet Rodríguez Castellón, Enrique
Ballesteros Plata, Daniel
Fellenz, Nicolás Antonio
author_role author
author2 Ballesteros Plata, Daniel
Fellenz, Nicolás Antonio
author2_role author
author
dc.subject.none.fl_str_mv HEXAVALENT CHROMIUM
ADSORPTION
REDUCTION
NITROGEN-DOPED
MCM-41
topic HEXAVALENT CHROMIUM
ADSORPTION
REDUCTION
NITROGEN-DOPED
MCM-41
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv Two Nitrogen-modified mesoporous MCM-41 type silicas were synthesized by the sol-gel route andpost-grafting surface modification procedure, obtaining an aminopropyl-modified MCM-41(denoted MCM-41-N) and an aminoethyl-aminopropyl-modified MCM-41 (denoted MCM-41-NN).Hexavalent chromium removal from acidified water by adsorption and reduction to Cr(III) on thesolid mesophases was analyzed. The modified silicas were characterized by powder X-raydiffraction, infrared spectroscopy, nitrogen adsorption-desorption measurements at -196 °C, X-rayphotoelectron spectroscopy, 29Si solid state Nuclear Magnetic Resonance, and thermogravimetricanalysis. Both samples exhibited very high capacities for decreasing Cr(VI) concentrations in water,according to the Langmuir isotherm model: 129.9 mg·g-1 for MCM-41-N and 133.3 mg·g-1for MCM-41-NN. The chromium speciation in the supernatant after 24 h indicates that MCM-41-N had a higher capacity to reduce Cr(VI) to the less toxic Cr(III) species than MCM-41-NN: 92.9 % vs 72.5 % when the initial Cr(VI) concentration was 10 ppm. These differences were related to the different capacity of nitrogen atoms in MCM-41-N and MCM-41-NN to interact with the surrounding surface silanolswhich are required for the chemical reduction of the hexavalent species to take place, as evidencedby infrared spectroscopy and X-ray photoelectron spectroscopy analysis. Also, the Cr(III)/Cr(VI)atomic ratios on the solid’s surfaces were higher for MCM-41-N. These results highlight thecharacteristics that nitrogen atoms incorporated to silica matrices must possess in order to maximizethe transformation of Cr(VI) into the trivalent species, thereby reducing the generation of toxic wasteharmful to living organisms.
Fil: Rodríguez Castellón, Enrique. Universidad de Málaga; España
Fil: Ballesteros Plata, Daniel. Universidad de Málaga; España
Fil: Fellenz, Nicolás Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
description Two Nitrogen-modified mesoporous MCM-41 type silicas were synthesized by the sol-gel route andpost-grafting surface modification procedure, obtaining an aminopropyl-modified MCM-41(denoted MCM-41-N) and an aminoethyl-aminopropyl-modified MCM-41 (denoted MCM-41-NN).Hexavalent chromium removal from acidified water by adsorption and reduction to Cr(III) on thesolid mesophases was analyzed. The modified silicas were characterized by powder X-raydiffraction, infrared spectroscopy, nitrogen adsorption-desorption measurements at -196 °C, X-rayphotoelectron spectroscopy, 29Si solid state Nuclear Magnetic Resonance, and thermogravimetricanalysis. Both samples exhibited very high capacities for decreasing Cr(VI) concentrations in water,according to the Langmuir isotherm model: 129.9 mg·g-1 for MCM-41-N and 133.3 mg·g-1for MCM-41-NN. The chromium speciation in the supernatant after 24 h indicates that MCM-41-N had a higher capacity to reduce Cr(VI) to the less toxic Cr(III) species than MCM-41-NN: 92.9 % vs 72.5 % when the initial Cr(VI) concentration was 10 ppm. These differences were related to the different capacity of nitrogen atoms in MCM-41-N and MCM-41-NN to interact with the surrounding surface silanolswhich are required for the chemical reduction of the hexavalent species to take place, as evidencedby infrared spectroscopy and X-ray photoelectron spectroscopy analysis. Also, the Cr(III)/Cr(VI)atomic ratios on the solid’s surfaces were higher for MCM-41-N. These results highlight thecharacteristics that nitrogen atoms incorporated to silica matrices must possess in order to maximizethe transformation of Cr(VI) into the trivalent species, thereby reducing the generation of toxic wasteharmful to living organisms.
publishDate 2025
dc.date.none.fl_str_mv 2025-08
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/11336/270759
Rodríguez Castellón, Enrique; Ballesteros Plata, Daniel; Fellenz, Nicolás Antonio; Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture; MDPI; Applied Sciences; 15; 17; 8-2025; 1-18
2076-3417
CONICET Digital
CONICET
url http://hdl.handle.net/11336/270759
identifier_str_mv Rodríguez Castellón, Enrique; Ballesteros Plata, Daniel; Fellenz, Nicolás Antonio; Conversion of Cr(VI) to Cr(III) in Water Using Amino-Modified Ordered Mesoporous Silicas: Influence of the Functional Group Architecture; MDPI; Applied Sciences; 15; 17; 8-2025; 1-18
2076-3417
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3390/app15179370
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
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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