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X-Ray Photoelectron Spectroscopic Study of Cobalt(II) and Nickel(II) Sorbed on Hectorite and Montmorillonite

Published online by Cambridge University Press:  02 April 2024

Nigel Davison ,
William R. McWhinnie  and
Alan Hooper
Nigel Davison
Affiliation:
Department of Chemical Engineering and Applied Chemistry, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom
William R. McWhinnie
Affiliation:
Department of Chemical Engineering and Applied Chemistry, Aston University, Aston Triangle, Birmingham B4 7ET, United Kingdom
Alan Hooper
Affiliation:
Central Electricity Generating Board Technology, Planning and Research Division, Berkley Nuclear Laboratories, Berkley, Gloucestershire GL13 9PB, United Kingdom
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Abstract

The safe disposal of 60Co, 63Ni, and 59Ni has required considerable information on the interactions of Co2+ and Ni2+ with clay minerals in the geosphere. X-ray photoelectron spectroscopy (XPS) has been used to probe the sorption sites for Co2+ and Ni2+ on hectorite and montmorillonite. The spectra were measured for Co-hectorite, Ni-hectorite, and Ni-montmorillonite immediately following ion exchange and after washing the clay two and five times with distilled water. The spectra, recorded following etching of the surface with an argon ion beam, differentiate two sorption sites; a labile (to washing) fraction sorbed as ion pairs, and a non-labile fraction sorbed by ion exchange at broken bond and interlamellar sites. The data were consistent with the sorption of metal ions (Co2+, Ni2+) in a common “MO6” ligand environment.

Co2+ had a greater affinity for exchange on hectorite than did Ni2+; but Ni2+ had a greater affinity for the surface of montmorillonite than for hectorite. The argon ion etching of Ni-montmorillonite gave rise to a new photopeak of 853 eV, which was probably due to elemental Ni formed consequent to the chemical violation of the surface by ion etching.

Keywords

Cation exchangeCobaltHectoriteLigand exchangeMontmorilloniteNickelX-ray photoelectron spectroscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 1 , February 1991 , pp. 22 - 27
Copyright
Copyright © 1991, The Clay Minerals Society

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