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Issue 24, 2001
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An in situ ATR-FTIR study on the adsorption of dicarboxylic acids onto kaolinite in aqueous suspensions

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Abstract

ATR-FTIR spectroscopy was used to investigate in situ the adsorption of simple compounds, such as dicarboxylic acids, hydroxybenzoic acids and resorcinol, onto the clay mineral kaolinite. Identification of the absorption bands was based on changes which occur in the spectra of the compounds on changing the pH value of the aqueous solution. The band shifts which occur in the spectra of the dicarboxylic acids as a result of the interaction with the kaolinite surface suggest inner-sphere complexes, where either one or both oxygen atoms of the carboxylic group are bound to the kaolinite surface. A comparison of the spectra of the dicarboxylic acids showed that small structural differences had a great influence on the kind of surface complex formed. In the case of the hydroxybenzoic acids and resorcinol, the band shifts were too small to make any statements regarding possible surface complexes.

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Publication details

The article was received on 29 Jun 2001, accepted on 19 Oct 2001 and first published on 21 Dec 2001


Article type: Paper
DOI: 10.1039/B105712J
Citation: Phys. Chem. Chem. Phys., 2001,3, 5444-5449
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    An in situ ATR-FTIR study on the adsorption of dicarboxylic acids onto kaolinite in aqueous suspensions

    C. H. Specht and F. H. Frimmel, Phys. Chem. Chem. Phys., 2001, 3, 5444
    DOI: 10.1039/B105712J

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