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The influence of layer charge on Zn2+ and Pb2+ sorption by smectites

Published online by Cambridge University Press:  09 July 2018

M. F. Brigatti ,
G. Campana ,
L. Medici  and
L. Poppi
M. F. Brigatti
Affiliation:
Department of Earth Sciences, University of Modena, Via S. Eufemia 19, 41100-Modena, Italy
G. Campana
Affiliation:
Department of Earth Sciences, University of Modena, Via S. Eufemia 19, 41100-Modena, Italy
L. Medici
Affiliation:
Department of Earth Sciences, University of Modena, Via S. Eufemia 19, 41100-Modena, Italy
L. Poppi
Affiliation:
Department of Earth Sciences, University of Modena, Via S. Eufemia 19, 41100-Modena, Italy
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Abstract

Two smectites with different layer charge localization were used to characterize the chemical and structural aspects of minerals treated with 1.9 × 10−2m and 1 m heavy metal solutions (Zn2+ and Pb2+). Natural and treated smectites were analysed by: (1) X-ray powder diffraction first at 25°C and relative humidity of 60% and then at increasing temperature up to 400°C; (2) thermo-gravimetric and differential thermal analysis; (3) X-ray fluorescence; (4) atomic absorption and UV visible spectrophotometries. The sorption of both metals depends on 2:1 layer features and is enhanced when the total layer charge is mostly due to substitution in the octahedral sheet. The variability between Zn2+- and Pb2+-treated smectites in the interlayer water content depends both upon cation electrostatic features and upon smectite layer charge localization. The greatest water content was observed in [Zn2+]1 m-treated smectite showing charge imbalance in the octahedral sheet. In smectites treated with [Zn2+]1 m solutions, an additional thermal reaction occurs at a temperature of ∼380°C, and the d(001) spacing, which is 10 Å at a temperature of ∼200°C, gradually decreases in the temperature range 200–400°C. In smectites treated with 1 m [Pb2+] solutions this value is reached at a temperature of ∼150°C and remains quite constant up to 400°C.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 4 , December 1996 , pp. 477 - 483
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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