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Incidence of lead uptake on the microstructure of a (Mg,Ca)-bearing bentonite (Prrenjas, Albania)

Nevila Jozja, Patrick Baillif, Jean-Claude Touray, Fabrice Muller and Christian Clinard
Incidence of lead uptake on the microstructure of a (Mg,Ca)-bearing bentonite (Prrenjas, Albania)
European Journal of Mineralogy (June 2006) 18 (3): 361-368


Comparisons are made between the Pb uptake and microstructural/morphological modification of an Albanian (Mg,Ca)-bentonite and a Wyoming montmorillonite transformed to the Mg-dominant form, using XRD and TEM. The Prrenjas bentonite is mainly a smectite, containing 10% of interlayered illite with associated kaolinite, antigorite, halloysite and minor chlorite; significant Mg is present in the octahedral layer in association with Al and Fe. The c.e.c. is rather high (> 80 meq/100g). Mg and Ca are the main cations exchanged during c.e.c. determinations and Pb uptake experiments. TEM shows that the microstructural units are composed of closely packed clay particles with 10-15 stacked platelets, in contrast to Wyoming montmorillonite. Exchange experiments with lead nitrate on suspended clays have been carried out with concentrations ranging from 10 (super -5) M to 10 (super -2) M. A comparable capacity for Pb sorption was observed for both clays. At the highest concentrations, XPS analyses of the Prrenjas bentonite reveal Pb sorption in a "non-interlayer" site and TEM images show a significant size decrease of microstructural units in relation to Pb sorption; in contrast, the Mg-exchanged Wyoming montmorillonite is not modified.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 3
Title: Incidence of lead uptake on the microstructure of a (Mg,Ca)-bearing bentonite (Prrenjas, Albania)
Affiliation: Institut des Sciences de la Terre d'Orleans, Orleans, France
Pages: 361-368
Published: 200606
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 31
Accession Number: 2006-061008
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N39°34'60" - N42°40'00", E19°15'00" - E21°04'60"
Secondary Affiliation: Centre de Recherche sur la Matiere Divisee, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200634
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