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Issue
Korean Journal of Chemical Engineering,
Vol.24, No.3, 451-456, 2007
Examination of the surface properties of kaolinites by inverse gas chromatography: Acid-base properties
Yang YC, Yoon PR
The specific component of the free energy of adsorption, .ΔGASP, of untreated kaolinite and kaolinites surfacetreated with isopropyl triisostearoyl titanate (ITT) and isopropyl tri(dioctylpyrophosphato) titanate (ITDT) was estimated, using the adsorption of several polar and non-polar probes on these surfaces at various measuring temperatures, by the inverse gas chromatography (IGC) method. The acid-base properties of the untreated kaolinite and surface-treated kaolinites were quantified by KA and KD parameters, reflecting the ability of the surface to act as an electron acceptor and donor, respectively. In the result, all kaolinite surfaces were amphoteric and were able to function as both an electron acceptor and an electron donor.
Keywords: Inverse Gas Chromatography (IGC); Specific Component of the Free Energy of Adsorption (ΔGASP); Enthalpy of Specific Adsorption (ΔHASP); Surface Acid-base Characteristics
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