Modeling adsorption-desorption processes of Cd on montmorillonite

Undabeytia López, Tomás; Nir, Shlomo; Rytwo, Giora; Morillo González, Esmeralda; Maqueda Porras, Celia; Comisión Interministerial de Ciencia y Tecnología, CICYT (España)

Modeling adsorption-desorption processes of Cd on montmorillonite

6 pages, 1 figure, 5 tables.

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Bibliographic Details
Main Authors:	Undabeytia López, Tomás, Nir, Shlomo, Rytwo, Giora, Morillo González, Esmeralda, Maqueda Porras, Celia
Other Authors:	Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
Format:	artículo biblioteca
Language:	English
Published:	Clay Minerals Society 1998-08
Subjects:	Cadmium, Cation adsorption model, Hysteresis, Montmorillonite,
Online Access:	http://hdl.handle.net/10261/40940 http://dx.doi.org/10.13039/501100007273
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spelling	dig-irnas-es-10261-409402018-09-13T10:12:12Z Modeling adsorption-desorption processes of Cd on montmorillonite Undabeytia López, Tomás Nir, Shlomo Rytwo, Giora Morillo González, Esmeralda Maqueda Porras, Celia Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Cadmium Cation adsorption model Hysteresis Montmorillonite 6 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 reviewed 2011-10-11T09:37:45Z 2011-10-11T09:37:45Z 1998-08 artículo http://purl.org/coar/resource_type/c_6501 Clays and Clay Minerals 46 (4): 423-428 (1998) 0009-8604 http://hdl.handle.net/10261/40940 http://dx.doi.org/10.13039/501100007273 en http://www.clays.org/journal/archive/volume%2046/46-4-423.pdf open Clay Minerals Society
institution	IRNAS ES
collection	DSpace
country	España
countrycode	ES
component	Bibliográfico
access	En linea
databasecode	dig-irnas-es
tag	biblioteca
region	Europa del Sur
libraryname	Biblioteca del IRNAS España
language	English
topic	Cadmium Cation adsorption model Hysteresis Montmorillonite Cadmium Cation adsorption model Hysteresis Montmorillonite
spellingShingle	Cadmium Cation adsorption model Hysteresis Montmorillonite Cadmium Cation adsorption model Hysteresis Montmorillonite Undabeytia López, Tomás Nir, Shlomo Rytwo, Giora Morillo González, Esmeralda Maqueda Porras, Celia Modeling adsorption-desorption processes of Cd on montmorillonite
description	6 pages, 1 figure, 5 tables.
author2	Comisión Interministerial de Ciencia y Tecnología, CICYT (España)
author_facet	Comisión Interministerial de Ciencia y Tecnología, CICYT (España) Undabeytia López, Tomás Nir, Shlomo Rytwo, Giora Morillo González, Esmeralda Maqueda Porras, Celia
format	artículo
topic_facet	Cadmium Cation adsorption model Hysteresis Montmorillonite
author	Undabeytia López, Tomás Nir, Shlomo Rytwo, Giora Morillo González, Esmeralda Maqueda Porras, Celia
author_sort	Undabeytia López, Tomás
title	Modeling adsorption-desorption processes of Cd on 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
publisher	Clay Minerals Society
publishDate	1998-08
url	http://hdl.handle.net/10261/40940 http://dx.doi.org/10.13039/501100007273
work_keys_str_mv	AT undabeytialopeztomas modelingadsorptiondesorptionprocessesofcdonmontmorillonite AT nirshlomo modelingadsorptiondesorptionprocessesofcdonmontmorillonite AT rytwogiora modelingadsorptiondesorptionprocessesofcdonmontmorillonite AT morillogonzalezesmeralda modelingadsorptiondesorptionprocessesofcdonmontmorillonite AT maquedaporrascelia modelingadsorptiondesorptionprocessesofcdonmontmorillonite
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Modeling adsorption-desorption processes of Cd on montmorillonite

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