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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:
, ,
DOI: 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.

Additional Publication Details

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
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1491
Last page:
1498
Number of Pages:
8