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Adsorption of Cations on Imogolite and their Effect on Surface Charge Characteristics

Published online by Cambridge University Press:  28 February 2024

James B. Harsh ,
S. J. Traina ,
J. Boyle  and
Ying Yang
James B. Harsh
Affiliation:
Department of Crops and Soil Sciences, College of Agriculture and Home Economics, Washington State University, Pullman, Washington 99164-6420
S. J. Traina
Affiliation:
Agronomy Department, Ohio State University, Columbus, Ohio 43210
J. Boyle
Affiliation:
Department of Crops and Soil Sciences, College of Agriculture and Home Economics, Washington State University, Pullman, Washington 99164-6420
Ying Yang
Affiliation:
Department of Crops and Soil Sciences, College of Agriculture and Home Economics, Washington State University, Pullman, Washington 99164-6420
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Abstract

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Noncrystalline aluminosilicates termed allophane and imogolite are common constituents of spodosols, soils derived from volcanic ash, and many inceptisols. The surface charge characteristics of their synthetic analogues may be used to better understand their ion retention properties. In this study, we determined the point of zero salt effect (PZSE) by potentiometric titration of allophanes with Al/Si ratios of 1.12, 1.52, and 2.04 and of imogolite with an Al/Si ratio of 2.02. We also used microelectrophoresis to determine the point of zero charge (PZC) at the particle shear plane for the same materials in CI solutions of Li, Na, Cs, and tetramethyl ammonium. The PZSE decreased with decreasing Al/Si ratio for the allophanes, but the imogolite PZSE was much lower than that of the allophane with 2.04 Al/Si. The PZC was always higher than the PZSE of the same material, especially for imogolite. The results are best explained if cations reside within the hollow tubes of imogolite. This conclusion is supported by a fluorescence study that showed that only quenchers smaller than the inner diameter of the imogolite tube could fully quench Ce-imogolite.

Keywords

Electrophoretic mobilityMicroelectrophoresisNoncrystalline aluminosilicatesPoints of zero chargePotentiometric titrationPZCPZNPCPZSEStructural modelsSurface chargeSurface complexation
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 6 , December 1992 , pp. 700 - 706
Copyright
Copyright © 1992, The Clay Minerals Society

Footnotes

Contribution from the College of Agriculture and Home Economics Research Center, Pullman, Washington. Paper No. 9101-07. Projects 0694 and 4694.

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