Modeling adsorption-desorption processes of Cd on montmorillonite

6 pages, 1 figure, 5 tables.

Detalles Bibliográficos
Autores: Undabeytia López, Tomás, Nir, Shlomo, Rytwo, Giora, Morillo González, Esmeralda, Maqueda Porras, Celia
Tipo de recurso: artículo
Fecha de publicación:1998
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/40940
Acceso en línea:http://hdl.handle.net/10261/40940
Access Level:acceso abierto
Palabra clave:Cadmium
Cation adsorption model
Hysteresis
Montmorillonite
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spelling Modeling adsorption-desorption processes of Cd on montmorilloniteUndabeytia López, TomásNir, ShlomoRytwo, GioraMorillo González, EsmeraldaMaqueda Porras, CeliaCadmiumCation adsorption modelHysteresisMontmorillonite6 pages, 1 figure, 5 tables.Adsorption-desorption of Cd to Ca montmorillonite (SAz-1) was studied at concentrations ranging from 44.5 to 266.8 IzM. An adsorption model was employed in the analysis of the data. The procedure consists of solving the electrostatic Gouy-Chapman equations and calculating adsorbed amounts of the cations as the sum of the cations residing in the double-layer region, and the cations chemically bound to the surface, in a closed system. The model also accounts explicitly for cation complexation in solution. The model yields good predictions for the adsorbed amounts of Cd, Ca and Mg, by employing binding coefficients from previous studies for the divalent cations and for Na, K and CdCI +. The model calculations also yield good predictions for the apparent hysteresis observed in the adsorbed amounts of Cd after each of 3 cycles of desorption. The apparent hysteresis is explained by the reduction in the total concentrations of Ca and Mg in desorption cycles, and the corresponding increase in the magnitude of the surface potential. Our estimates indicate that adsorption of Cd is mostly to planar, rather than edge sites of the clay mineral.This work was mostly supported by funds from the Spanish Government, Research Project AMB95-0904. T. Undabeytia acknowledges the Spanish Government for a postdoctoral fellowship (ref. PF96 33975424) at the Seagram Center.Peer reviewedClay Minerals SocietyComisión Interministerial de Ciencia y Tecnología, CICYT (España)201120111998info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/40940reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.clays.org/journal/archive/volume%2046/46-4-423.pdfinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/409402026-05-22T06:33:51Z
dc.title.none.fl_str_mv Modeling adsorption-desorption processes of Cd on montmorillonite
title Modeling adsorption-desorption processes of Cd on montmorillonite
spellingShingle Modeling adsorption-desorption processes of Cd on montmorillonite
Undabeytia López, Tomás
Cadmium
Cation adsorption model
Hysteresis
Montmorillonite
title_short Modeling adsorption-desorption processes of Cd on montmorillonite
title_full Modeling adsorption-desorption processes of Cd on montmorillonite
title_fullStr Modeling adsorption-desorption processes of Cd on montmorillonite
title_full_unstemmed Modeling adsorption-desorption processes of Cd on montmorillonite
title_sort Modeling adsorption-desorption processes of Cd on montmorillonite
dc.creator.none.fl_str_mv Undabeytia López, Tomás
Nir, Shlomo
Rytwo, Giora
Morillo González, Esmeralda
Maqueda Porras, Celia
author Undabeytia López, Tomás
author_facet Undabeytia López, Tomás
Nir, Shlomo
Rytwo, Giora
Morillo González, Esmeralda
Maqueda Porras, Celia
author_role author
author2 Nir, Shlomo
Rytwo, Giora
Morillo González, Esmeralda
Maqueda Porras, Celia
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
dc.subject.none.fl_str_mv Cadmium
Cation adsorption model
Hysteresis
Montmorillonite
topic Cadmium
Cation adsorption model
Hysteresis
Montmorillonite
description 6 pages, 1 figure, 5 tables.
publishDate 1998
dc.date.none.fl_str_mv 1998
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/40940
url http://hdl.handle.net/10261/40940
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.clays.org/journal/archive/volume%2046/46-4-423.pdf
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Clay Minerals Society
publisher.none.fl_str_mv Clay Minerals Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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