Zeta potential study of natural- and acid-activated sepiolites in electrolyte solutions

DİKMEN S., Yilmaz G., YÖRÜKOĞULLARI E., Korkmaz E.

CANADIAN JOURNAL OF CHEMICAL ENGINEERING, vol.90, no.3, pp.785-792, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 90 Issue: 3
  • Publication Date: 2012
  • Doi Number: 10.1002/cjce.20573
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.785-792
  • Keywords: sepiolite, zeta potential, isoelectric point, acid activation, ELECTROKINETIC PROPERTIES, ADSORPTION, BEHAVIOR, PALYGORSKITE, KAOLINITE, REMOVAL, AREA
  • Anadolu University Affiliated: Yes


Detailed characterisation of natural sepiolite from the Eskisehir region of Turkey was performed using X-ray diffraction, X-ray fluorescence, field emission scanning electron microscopy, specific surface area (BET method), Fourier transform infrared spectra, derivative thermogravimetry (DTG) and differential thermal analysis. Electrokinetic properties of natural- and acid-activated sepiolites were investigated as a function of the concentration of various electrolytes, such as NaCl, KCl, LiCl, CaCl2, MgCl2, NaNO3, Na2CO3, FeCl3 and Al(NO3)3. While mono and divalent cations and anions did not change the surface charge of natural- and acid-activated sepiolite, trivalent cations changed the surface charge from negative to positive. Acid-activated sepiolite samples shifted towards the positive region in nearly all electrolyte solutions when compared with the natural sepiolite. (C) 2011 Canadian Society for Chemical Engineering