Adsorption of safranine-O on hydrophilic and hydrophobic glass surfaces


Atun G., Hisarli G., Tuncay M.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, cilt.143, ss.27-33, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 143 Konu: 1
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1016/s0927-7757(98)00494-4
  • Dergi Adı: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
  • Sayfa Sayıları: ss.27-33

Özet

The adsorption behaviour of safranine-O on specially prepared hydrophilic and hydrophobic surfaces of glass powder was studied at various temperatures (25-55 degrees C). It was seen that the hydrophobic surfaces adsorbed more safranine-O than hydrophilic surfaces at low concentrations while the saturation Value of safranine-O on the hydrophilic surface was greater than that on the hydrophobic surface. This indicated that safranine-O may have been adsorbed by different mechanisms on the two types of surfaces. The different shapes of the adsorption isotherms supported this result. Safranine-O molecules perpendicularly oriented at low concentrations on the hydrophilic surface while adsorption was partly flatwise on the hydrophobic surface. Adsorption of safranine-O can form with Langmuir isotherm at high concentrations for both type of surfaces. Thermodynamic parameters were compared for both surfaces. (C) 1998 Elsevier Science B.V. All rights reserved.