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Molecular Structure Effects on Diffusion of Cations in Clays

Published online by Cambridge University Press:  28 February 2024

Alanah Fitch ,
John Song  and
Jenny Stein
Alanah Fitch
Affiliation:
Department of Chemistry, Loyola University of Chicago, 6525 N. Sheridan Rd. Chicago, Illinois 60626
John Song
Affiliation:
Department of Chemistry, Loyola University of Chicago, 6525 N. Sheridan Rd. Chicago, Illinois 60626
Jenny Stein
Affiliation:
Department of Chemistry, Loyola University of Chicago, 6525 N. Sheridan Rd. Chicago, Illinois 60626
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Abstract

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The roles of molecular structure and charge are examined in the transport of cations within montmorillonite clay films. The series of Ru(NH3)63+, Co(NH3)3+, Co(en)33+, Co(sep)3+ and Co(bpy)33+ are examined in detail via electrochemical and spectrochemical methods. The electrochemical signal is enhanced both in minimizing the time required to develop the signal and in the magnitude of the signal for Ru(NH3)63+. In addition, the potential for the observed reduction peak is shifted negative and the current peak associated with reduction disappears with rinsing of the clay film. These observations are characteristic of a compound that is held by simple electrostatic charge characteristics. In contrast, the compounds Co(NH3)3+, Co(en)33+ and Co(sep)3+, while showing rapid and enhanced signal development, eventually evolve a signal that is diminished with respect to the bare electrode, consistent with a hydrophobic mode of retention. The signal for Co(bpy)33+ is slow to be observed, is diminished with respect to the bare electrode and is shifted positive in potential, all hallmarks of a strong, non-electrostatic mode of binding within the clay.

Keywords

Clay-modified electrodesCo complexesDiffusionTransport
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 3 , June 1996 , pp. 370 - 380
Copyright
Copyright © 1996, The Clay Minerals Society

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