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Adsorption of goethite onto quartz and kaolinite

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
By: , , and 
https://doi.org/10.1039/F19848001491

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Abstract

The adsorption of colloidal goethite onto quartz and kaolinite substrates has been studied as a function of pH and NaCl concentration. Goethite adsorption was measured quantitatively by Fourier-transform infrared spectroscopy. The results indicate that adsorption onto both substrates is due primarily to coulombic forces; however, the pH dependence of adsorption is very different for the two substrates. This is explained by the fact that the surface charge on quartz is entirely pH-dependent, while kaolinite has surface faces which carry a permanent negative charge. Adsorption of goethite on to kaolinite increases markedly with increasing NaCl concentration, while adsorption onto quartz is relatively independent of NaCl concentration. This can be explained by the influence of NaCl concentration upon the development of surface charge on the substrates. A method is described for separating surface-bound goethite from free goethite.

Suggested Citation

Goldberg, M.C., Weiner, E.R., Boymel, P., 1984, Adsorption of goethite onto quartz and kaolinite: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, v. 80, no. 6, p. 1491-1498, https://doi.org/10.1039/F19848001491.

Publication type Article
Publication Subtype Journal Article
Title Adsorption of goethite onto quartz and kaolinite
Series title Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
DOI 10.1039/F19848001491
Volume 80
Issue 6
Year Published 1984
Language English
Publisher Royal Society of Chemistry
Contributing office(s) Toxic Substances Hydrology Program
Description 8 p.
First page 1491
Last page 1498
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