Determination of the surface properties of kaolinite by inverse gas chromatography

Bilgic C.

Water Science and Technology, cilt.2017, sa.2, ss.319-328, 2017 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2017 Sayı: 2
  • Basım Tarihi: 2017
  • Doi Numarası: 10.2166/wst.2018.136
  • Dergi Adı: Water Science and Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.319-328
  • Anahtar Kelimeler: Acid–base surface characteristics, Adsorption thermodynamic parameters, Inverse gas chromatography, Kaolinite
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

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.