Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition

Clay-based minerals are considered to be an important component in backfill barriers due to both their ability to seal and adsorb radioactive waste and to interact chemically with it under subcritical conditions. Herein, we describe a systematic study of the properties of layered silicates that coul...

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Autores: Chain Villar, Pablo, Cota Reguero, Agustín, Pavón González, Esperanza, Pazos Zarama, Mery Carolina, Alba Carranza, María Dolores
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2013
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/70496
Acceso en línea:https://hdl.handle.net/11441/70496
https://doi.org/10.1016/j.chemgeo.2013.03.006
Access Level:acceso abierto
Palabra clave:Subcritical conditions
Hydrothermal 35 treatment
Rare-earth
Radioactive waste
Engineered barrier
X-ray diffraction
MAS-NMR
Disilicates
Bentonite
Smectite
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spelling Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space compositionChain Villar, PabloCota Reguero, AgustínPavón González, EsperanzaPazos Zarama, Mery CarolinaAlba Carranza, María DoloresSubcritical conditionsHydrothermal 35 treatmentRare-earthRadioactive wasteEngineered barrierX-ray diffractionMAS-NMRDisilicatesBentoniteSmectiteClay-based minerals are considered to be an important component in backfill barriers due to both their ability to seal and adsorb radioactive waste and to interact chemically with it under subcritical conditions. Herein, we describe a systematic study of the properties of layered silicates that could affect their hydrothermal reactivity, namely type of layers, octahedral occupancy, origin and total amount of the layer charge, and nature of the interlayer cation. The silicates studied were selected on the basis of their different characteristics associated with these properties and were treated hydrothermally at 300 °C for 48 h in a 7.3 · 10− 2 M Lu(NO3)3 · 3.6H2O solution. The final products were analyzed by X-ray diffraction and solid-state NMR spectroscopy. All the layered silicates studied were found to be able to generate a Lu2Si2O7 phase after hydrothermal treatment under subcritical conditions, thereby confirming the participation of a chemical mechanism of the clay barrier generating phases being stables with temperature and pH conditions. However, the extent of this reaction depends to a large extent on the physicochemical properties of the framework and the interlayer space composition, such as the presence or absence of an octahedral sheet, the degree of occupancy of this sheet, and the origin and total layer charge. Therefore, this study allows tuning the clay mineral framework characteristic that favors the rare earth cations (as trivalent actinide simulator) immobilization.Dirección General de Investigaciones Científicas y Técnicas CTQ2010-14874ElsevierMinisterio de Ciencia e Innovación (MICIN). España2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/70496https://doi.org/10.1016/j.chemgeo.2013.03.006reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésChemical Geology, 347, 208-216.CTQ2010-14874http://dx.doi.org/10.1016/j.chemgeo.2013.03.006info:eu-repo/semantics/openAccessoai:idus.us.es:11441/704962026-06-17T12:51:07Z
dc.title.none.fl_str_mv Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
title Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
spellingShingle Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
Chain Villar, Pablo
Subcritical conditions
Hydrothermal 35 treatment
Rare-earth
Radioactive waste
Engineered barrier
X-ray diffraction
MAS-NMR
Disilicates
Bentonite
Smectite
title_short Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
title_full Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
title_fullStr Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
title_full_unstemmed Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
title_sort Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition
dc.creator.none.fl_str_mv Chain Villar, Pablo
Cota Reguero, Agustín
Pavón González, Esperanza
Pazos Zarama, Mery Carolina
Alba Carranza, María Dolores
author Chain Villar, Pablo
author_facet Chain Villar, Pablo
Cota Reguero, Agustín
Pavón González, Esperanza
Pazos Zarama, Mery Carolina
Alba Carranza, María Dolores
author_role author
author2 Cota Reguero, Agustín
Pavón González, Esperanza
Pazos Zarama, Mery Carolina
Alba Carranza, María Dolores
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (MICIN). España
dc.subject.none.fl_str_mv Subcritical conditions
Hydrothermal 35 treatment
Rare-earth
Radioactive waste
Engineered barrier
X-ray diffraction
MAS-NMR
Disilicates
Bentonite
Smectite
topic Subcritical conditions
Hydrothermal 35 treatment
Rare-earth
Radioactive waste
Engineered barrier
X-ray diffraction
MAS-NMR
Disilicates
Bentonite
Smectite
description Clay-based minerals are considered to be an important component in backfill barriers due to both their ability to seal and adsorb radioactive waste and to interact chemically with it under subcritical conditions. Herein, we describe a systematic study of the properties of layered silicates that could affect their hydrothermal reactivity, namely type of layers, octahedral occupancy, origin and total amount of the layer charge, and nature of the interlayer cation. The silicates studied were selected on the basis of their different characteristics associated with these properties and were treated hydrothermally at 300 °C for 48 h in a 7.3 · 10− 2 M Lu(NO3)3 · 3.6H2O solution. The final products were analyzed by X-ray diffraction and solid-state NMR spectroscopy. All the layered silicates studied were found to be able to generate a Lu2Si2O7 phase after hydrothermal treatment under subcritical conditions, thereby confirming the participation of a chemical mechanism of the clay barrier generating phases being stables with temperature and pH conditions. However, the extent of this reaction depends to a large extent on the physicochemical properties of the framework and the interlayer space composition, such as the presence or absence of an octahedral sheet, the degree of occupancy of this sheet, and the origin and total layer charge. Therefore, this study allows tuning the clay mineral framework characteristic that favors the rare earth cations (as trivalent actinide simulator) immobilization.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/70496
https://doi.org/10.1016/j.chemgeo.2013.03.006
url https://hdl.handle.net/11441/70496
https://doi.org/10.1016/j.chemgeo.2013.03.006
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Chemical Geology, 347, 208-216.
CTQ2010-14874
http://dx.doi.org/10.1016/j.chemgeo.2013.03.006
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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