Determination of the surface properties of kaolinite by inverse gas chromatography
Water Science and Technology, vol.2017, no.2, pp.319-328, 2017 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 2017 Issue: 2
- Publication Date: 2017
- Doi Number: 10.2166/wst.2018.136
- Journal Name: Water Science and Technology
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.319-328
- Keywords: Acid–base surface characteristics, Adsorption thermodynamic parameters, Inverse gas chromatography, Kaolinite
- Eskisehir Osmangazi University Affiliated: Yes
Abstract
Inverse gas chromatography (IGC) was applied to characterize the surface of kaolinite. The adsorption thermodynamic parameters (the standard enthalpy (ΔH 0 ), entropy (ΔS 0 ) and free energy of adsorption (ΔG 0 ), the dispersive component of the surface energy (γ d S ), and the acid/base character of kaolinite surface were estimated by using the retention time of different non-polar and polar probes at infinite dilution region. The specific free energy of adsorption (ΔG sp ), the specific enthalpy of adsorption (ΔH sp ), and the specific entropy of adsorption (ΔS sp ) of polar probes on kaolinite were determined. ΔG sp values were correlated with the donor and modified acceptor numbers of the probes to quantify the acidic (K A ) and the basic (K D ) parameters of the kaolinite surface. The values obtained for the parameters K A and K D indicated a basic character for kaolinite surface.