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Tin-Clay Complexes: A Mössbauer Study

Published online by Cambridge University Press:  28 February 2024

D. Petridis  and
T. Bakas
D. Petridis
Affiliation:
Institute of Materials Science, N.R.C.P.S. “Demokritos”, GR-153 10, Athens, Greece
T. Bakas
Affiliation:
Physics Department, University of Ioannina, GR-451 10, Ioannina, Greece
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Abstract

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Divalent tin has been intercalated into montmorillonite by reacting partially hydrolyzed solutions of SnCl2 under aerobic conditions at pH = 2.8 with aqueous dispersions of the smectite mineral. The precursor tin solution contains mainly the cationic trimeric ion Sn3(OH)42+, which is shown to take part in the exchange reactions with the surface cations of the mineral. Variable temperature Mössbauer spectroscopy was used in order to: 1) directly probe changes in the oxidation state and coordination environment of Sn2+ in the process of intercalation; 2) examine the nature of tin atoms on the external surfaces and in the interlayer space of the clay platelets; and 3) study the dynamics of motion of tin atoms on the clay surfaces.

The main conclusion from these studies is that about 75% of the Sn2+ ions undergo extensive oxidation to the +4 state with concomitant hydrolysis and condensation that lead to the precipitation of SnO2 on the external surfaces of the clay. The rest of the Sn2+ ions are introduced into the lamellar zone, as evidenced by the detailed Mössbauer analysis of the dynamics of motion of tin atoms on the clay surfaces.

Keywords

ClayMontmorilloniteMössbauerIntercalation
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 1 , February 1997 , pp. 73 - 76
Copyright
Copyright © 1997, The Clay Minerals Society

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