Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides

Layered double hydroxides (LDHs) present multiple applications due to their versatility and reactivity. Thus, Ca–Al LDHs with Friedel’s salt structure (HC) have been proposed as heavy metal scavengers due to their buffering capacity at basic pHs. Nevertheless, the control of the reactivity of LDHs s...

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Detalles Bibliográficos
Autores: Borgiallo, Andres, Rojas Delgado, Ricardo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/125635
Acceso en línea:http://hdl.handle.net/11336/125635
Access Level:acceso abierto
Palabra clave:CHELATION
HYDROCALUMITE
IONIC GELATION
PH BUFFERING
PRECIPITATION
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
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repository_id_str
spelling Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxidesBorgiallo, AndresRojas Delgado, RicardoCHELATIONHYDROCALUMITEIONIC GELATIONPH BUFFERINGPRECIPITATIONhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1Layered double hydroxides (LDHs) present multiple applications due to their versatility and reactivity. Thus, Ca–Al LDHs with Friedel’s salt structure (HC) have been proposed as heavy metal scavengers due to their buffering capacity at basic pHs. Nevertheless, the control of the reactivity of LDHs such as HC is necessary to optimize their applications. Here, the reactivity of an HC prepared by a coprecipitation method was modified by its inclusion in calcium alginate (CaAlg) beads prepared by ionic gelation. The obtained beads (CaAlg/HC) showed good dispersion of the HC particles in the alginate matrix and were used to test the acid base reactivity and heavy metal uptake capacity compared with pure CaAlg beads and HC powder separately. The pH buffering capacity of CaAlg beads was enriched by the inclusion of HC that, in turn, was modulated in its reactivity. Thus, the HC dissolution times changed from mere seconds for the powder to tens of minutes when enclosed in the beads in a kinetic profile determined by the diffusive step. On the other hand, Cu2+ uptake capacity of CaAlg/HC beads combined the Cu(OH)2 precipitation capacity of HC with the complexation capacity of alginate, reaching good affinity and capacity for the obtained beads. Nevertheless, the precipitation of the hydroxide was produced outside the bead, which would induce the addition of an additional separation step to produce an acceptable Cu2+ elimination.Fil: Borgiallo, Andres. 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; ArgentinaFil: 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; ArgentinaMDPI AG2019-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/125635Borgiallo, Andres; Rojas Delgado, Ricardo; Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides; MDPI AG; ChemEngineering; 3; 1; 3-2019; 1-132305-7084CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2305-7084/3/1/22info:eu-repo/semantics/altIdentifier/doi/10.3390/chemengineering3010022info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:13:59Zoai:ri.conicet.gov.ar:11336/125635instacron: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:34982024-05-08 14:14:00.238CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
title Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
spellingShingle Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
Borgiallo, Andres
CHELATION
HYDROCALUMITE
IONIC GELATION
PH BUFFERING
PRECIPITATION
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
title_short Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
title_full Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
title_fullStr Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
title_full_unstemmed Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
title_sort Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides
dc.creator.none.fl_str_mv Borgiallo, Andres
Rojas Delgado, Ricardo
author Borgiallo, Andres
author_facet Borgiallo, Andres
Rojas Delgado, Ricardo
author_role author
author2 Rojas Delgado, Ricardo
author2_role author
dc.subject.none.fl_str_mv CHELATION
HYDROCALUMITE
IONIC GELATION
PH BUFFERING
PRECIPITATION
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
topic CHELATION
HYDROCALUMITE
IONIC GELATION
PH BUFFERING
PRECIPITATION
https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
description Layered double hydroxides (LDHs) present multiple applications due to their versatility and reactivity. Thus, Ca–Al LDHs with Friedel’s salt structure (HC) have been proposed as heavy metal scavengers due to their buffering capacity at basic pHs. Nevertheless, the control of the reactivity of LDHs such as HC is necessary to optimize their applications. Here, the reactivity of an HC prepared by a coprecipitation method was modified by its inclusion in calcium alginate (CaAlg) beads prepared by ionic gelation. The obtained beads (CaAlg/HC) showed good dispersion of the HC particles in the alginate matrix and were used to test the acid base reactivity and heavy metal uptake capacity compared with pure CaAlg beads and HC powder separately. The pH buffering capacity of CaAlg beads was enriched by the inclusion of HC that, in turn, was modulated in its reactivity. Thus, the HC dissolution times changed from mere seconds for the powder to tens of minutes when enclosed in the beads in a kinetic profile determined by the diffusive step. On the other hand, Cu2+ uptake capacity of CaAlg/HC beads combined the Cu(OH)2 precipitation capacity of HC with the complexation capacity of alginate, reaching good affinity and capacity for the obtained beads. Nevertheless, the precipitation of the hydroxide was produced outside the bead, which would induce the addition of an additional separation step to produce an acceptable Cu2+ elimination.
publishDate 2019
dc.date.none.fl_str_mv 2019-03
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/11336/125635
Borgiallo, Andres; Rojas Delgado, Ricardo; Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides; MDPI AG; ChemEngineering; 3; 1; 3-2019; 1-13
2305-7084
CONICET Digital
CONICET
url http://hdl.handle.net/11336/125635
identifier_str_mv Borgiallo, Andres; Rojas Delgado, Ricardo; Reactivity and heavy metal removal capacity of calcium alginate beads loaded with Ca–Al layered double hydroxides; MDPI AG; ChemEngineering; 3; 1; 3-2019; 1-13
2305-7084
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.mdpi.com/2305-7084/3/1/22
info:eu-repo/semantics/altIdentifier/doi/10.3390/chemengineering3010022
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 MDPI AG
publisher.none.fl_str_mv MDPI AG
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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 15,812429

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