Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/62053
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Campo DC | Valor | Lengua/Idioma |
---|---|---|
dc.contributor.author | Undabeytia López, Tomás | - |
dc.contributor.author | Nir, Shlomo | - |
dc.contributor.author | Polubesova, T. | - |
dc.contributor.author | Rytwo, Giora | - |
dc.contributor.author | Morillo González, Esmeralda | - |
dc.contributor.author | Maqueda Porras, Celia | - |
dc.date.accessioned | 2012-12-05T11:33:11Z | - |
dc.date.available | 2012-12-05T11:33:11Z | - |
dc.date.issued | 1999 | - |
dc.identifier | doi: 10.1021/es980822k | - |
dc.identifier | issn: 0013-936X | - |
dc.identifier | e-issn: 1520-5851 | - |
dc.identifier.citation | Environmental Science and Technology 33: 864-869 (1999) | - |
dc.identifier.uri | http://hdl.handle.net/10261/62053 | - |
dc.description.abstract | Effect of the aggregation state of montmorillonite clays of types SAz-1 and SWy-1 on the adsorption of the monovalent organic cation chlordimeform was studied. The shapes of the adsorption isotherms were related to the degree of dispersion of the clay, changing from S- to L-type by decreasing clay concentration. Unlike monovalent organic cations denoted dyes, chlordimeform adsorption did not exceed the cationic exchange capacity of the clay (CEC). At larger Ca2+/Na+ charge ratio (≃0.5), chlordimeform exhibited low apparent affinity for adsorbing to the SAz-1 clay, due to steric inhibition of its penetration between closely opposed clay platelets. The apparent affinity increased dramatically at smaller Ca2+/Na+ charge ratios (<0.06) for Ca2+-montmorillonite, or by switching to Na+- montmorillonite. The desorption process of chlordimeform shows an apparent hysteresis in Ca2+-montmorillonite. An adsorption model which combines electrostatic equations with specific binding in a closed system is able to account for part of this hysteresis by the reduction in the concentrations of the divalent cations Ca2+ and Mg2+ in the supernatant. Part of the hysteresis arises from a different state of aggregation of the Ca2+-clay in the adsorption and desorption experiments. The model also yields good predictions for the competition between chlordimeform and Cd in adsorption processes and their consecutive desorptions. | Effect of the aggregation state of montmorillonite clays of types SAz-1 and SWy-1 on the adsorption of the monovalent organic cation chlordimeform was studied. The shapes of the adsorption isotherms were related to the degree of dispersion of the clay, changing from S- to L-type by decreasing clay concentration. Unlike monovalent organic cations denoted dyes, chlordimeform adsorption did not exceed the cationic exchange capacity of the clay (CEC). At larger Ca2+/Na+ charge ratio (≈0.5), chlordimeform exhibited low apparent affinity for adsorbing to the SAz-1 clay, due to steric inhibition of its penetration between closely opposed clay platelets. The apparent affinity increased dramatically at smaller Ca2+/Na+ charge ratios (<0.06) for Ca2+-montmorillonite, or by switching to Na+-montmorillonite. The desorption process of chlordimeform shows an apparent hysteresis in Ca2+-montmorillonite. An adsorption model which combines electrostatic equations with specific binding in a closed system is able to account for part of this hysteresis by the reduction in the concentrations of the divalent cations Ca2+ and Mg2+ in the supernatant. Part of the hysteresis arises from a different state of aggregation of the Ca2+-clay in the adsorption and desorption experiments. The model also yields good predictions for the competition between chlordimeform and Cd in adsorption processes and their consecutive desorptions. | - |
dc.language.iso | eng | - |
dc.publisher | American Chemical Society | - |
dc.rights | openAccess | - |
dc.title | Adsorption-desorption of chlordimeform on montmorillonite: effect of clay aggregation and competitive adsorption with cadmium | - |
dc.type | artículo | - |
dc.identifier.doi | 10.1021/es980822k | - |
dc.date.updated | 2012-12-05T11:33:11Z | - |
dc.description.version | Peer Reviewed | - |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.openairetype | artículo | - |
item.grantfulltext | open | - |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
Aparece en las colecciones: | (IRNAS) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Adsorption-desorption of chlordimeform on montmorillonite.pdf | 73,3 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
29
checked on 01-abr-2024
WEB OF SCIENCETM
Citations
23
checked on 26-feb-2024
Page view(s)
469
checked on 22-abr-2024
Download(s)
306
checked on 22-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.