Copper, lead and cadmium removal by Ca Al layered double hydroxides

Autores
Rojas Delgado, Ricardo
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Layered double hydroxides are increasingly studied as heavy metal scavengers due to their acid/base buffering capacity that leads to hydroxide precipitation. Their intercalation with ligands such as edta also provides active sites for heavy metal chelation to these solids. In this work, both mechanisms are studied in Ca–Al layered double hydroxides (LDHs) with a Friedel's salt layered structure and intercalated with either nitrate (Ca–Al–NO3) or [Ca(edta)]2 − (Ca–Al–[Ca(edta)]). With this aim, the acid–base buffering capacity of these solids was determined and their removal behavior studied as a function of equilibrium concentration and pH. The solids presented high instability, Ca2 + ions being selectively leached at pH values as high as 8. As a consequence, high affinity and large removal capacity of Cu2 +, Cd2 + and Pb2 + were obtained for Ca–Al–NO3 by a hydroxide precipitation mechanism. The removal capacity of Ca–Al–[Ca(edta)] was quite similar, however, a portion of heavy metal ions was solubilized due to [Ca(edta)]2 − release. The heavy metal hydroxides obtained by the Ca–Al LDH removal action produced immobilization at pH values lower than those produced by simple alkalinization.
Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Materia
Friedel'S Salts
Heavy Metal Removal
Acid–Base Buffering
Precipitation
Chelation
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:11336/31354

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spelling Copper, lead and cadmium removal by Ca Al layered double hydroxidesRojas Delgado, RicardoFriedel'S SaltsHeavy Metal RemovalAcid–Base BufferingPrecipitationChelationhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Layered double hydroxides are increasingly studied as heavy metal scavengers due to their acid/base buffering capacity that leads to hydroxide precipitation. Their intercalation with ligands such as edta also provides active sites for heavy metal chelation to these solids. In this work, both mechanisms are studied in Ca–Al layered double hydroxides (LDHs) with a Friedel's salt layered structure and intercalated with either nitrate (Ca–Al–NO3) or [Ca(edta)]2 − (Ca–Al–[Ca(edta)]). With this aim, the acid–base buffering capacity of these solids was determined and their removal behavior studied as a function of equilibrium concentration and pH. The solids presented high instability, Ca2 + ions being selectively leached at pH values as high as 8. As a consequence, high affinity and large removal capacity of Cu2 +, Cd2 + and Pb2 + were obtained for Ca–Al–NO3 by a hydroxide precipitation mechanism. The removal capacity of Ca–Al–[Ca(edta)] was quite similar, however, a portion of heavy metal ions was solubilized due to [Ca(edta)]2 − release. The heavy metal hydroxides obtained by the Ca–Al LDH removal action produced immobilization at pH values lower than those produced by simple alkalinization.Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaElsevier Science2014-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/31354Copper, lead and cadmium removal by Ca Al layered double hydroxides; Elsevier Science; Applied Clay Science; 87; 1-2014; 254-2590169-1317CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2013.11.015info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0169131713003840info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:17:57Zoai:ri.conicet.gov.ar:11336/31354instacron: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 15:17:58.079CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Copper, lead and cadmium removal by Ca Al layered double hydroxides
title Copper, lead and cadmium removal by Ca Al layered double hydroxides
spellingShingle Copper, lead and cadmium removal by Ca Al layered double hydroxides
Rojas Delgado, Ricardo
Friedel'S Salts
Heavy Metal Removal
Acid–Base Buffering
Precipitation
Chelation
title_short Copper, lead and cadmium removal by Ca Al layered double hydroxides
title_full Copper, lead and cadmium removal by Ca Al layered double hydroxides
title_fullStr Copper, lead and cadmium removal by Ca Al layered double hydroxides
title_full_unstemmed Copper, lead and cadmium removal by Ca Al layered double hydroxides
title_sort Copper, lead and cadmium removal by Ca Al layered double hydroxides
dc.creator.none.fl_str_mv Rojas Delgado, Ricardo
author Rojas Delgado, Ricardo
author_facet Rojas Delgado, Ricardo
author_role author
dc.subject.none.fl_str_mv Friedel'S Salts
Heavy Metal Removal
Acid–Base Buffering
Precipitation
Chelation
topic Friedel'S Salts
Heavy Metal Removal
Acid–Base Buffering
Precipitation
Chelation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Layered double hydroxides are increasingly studied as heavy metal scavengers due to their acid/base buffering capacity that leads to hydroxide precipitation. Their intercalation with ligands such as edta also provides active sites for heavy metal chelation to these solids. In this work, both mechanisms are studied in Ca–Al layered double hydroxides (LDHs) with a Friedel's salt layered structure and intercalated with either nitrate (Ca–Al–NO3) or [Ca(edta)]2 − (Ca–Al–[Ca(edta)]). With this aim, the acid–base buffering capacity of these solids was determined and their removal behavior studied as a function of equilibrium concentration and pH. The solids presented high instability, Ca2 + ions being selectively leached at pH values as high as 8. As a consequence, high affinity and large removal capacity of Cu2 +, Cd2 + and Pb2 + were obtained for Ca–Al–NO3 by a hydroxide precipitation mechanism. The removal capacity of Ca–Al–[Ca(edta)] was quite similar, however, a portion of heavy metal ions was solubilized due to [Ca(edta)]2 − release. The heavy metal hydroxides obtained by the Ca–Al LDH removal action produced immobilization at pH values lower than those produced by simple alkalinization.
Fil: Rojas Delgado, Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
description Layered double hydroxides are increasingly studied as heavy metal scavengers due to their acid/base buffering capacity that leads to hydroxide precipitation. Their intercalation with ligands such as edta also provides active sites for heavy metal chelation to these solids. In this work, both mechanisms are studied in Ca–Al layered double hydroxides (LDHs) with a Friedel's salt layered structure and intercalated with either nitrate (Ca–Al–NO3) or [Ca(edta)]2 − (Ca–Al–[Ca(edta)]). With this aim, the acid–base buffering capacity of these solids was determined and their removal behavior studied as a function of equilibrium concentration and pH. The solids presented high instability, Ca2 + ions being selectively leached at pH values as high as 8. As a consequence, high affinity and large removal capacity of Cu2 +, Cd2 + and Pb2 + were obtained for Ca–Al–NO3 by a hydroxide precipitation mechanism. The removal capacity of Ca–Al–[Ca(edta)] was quite similar, however, a portion of heavy metal ions was solubilized due to [Ca(edta)]2 − release. The heavy metal hydroxides obtained by the Ca–Al LDH removal action produced immobilization at pH values lower than those produced by simple alkalinization.
publishDate 2014
dc.date.none.fl_str_mv 2014-01
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/11336/31354
Copper, lead and cadmium removal by Ca Al layered double hydroxides; Elsevier Science; Applied Clay Science; 87; 1-2014; 254-259
0169-1317
CONICET Digital
CONICET
url http://hdl.handle.net/11336/31354
identifier_str_mv Copper, lead and cadmium removal by Ca Al layered double hydroxides; Elsevier Science; Applied Clay Science; 87; 1-2014; 254-259
0169-1317
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.clay.2013.11.015
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0169131713003840
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 Science
publisher.none.fl_str_mv Elsevier Science
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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