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Interfacial and Electrochemical Phenomena

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

  1. Sedef Dikmen1,*,
  2. Gulgun Yilmaz2,
  3. Ertugrul Yorukogullari1,
  4. Emine Korkmaz3

Article first published online: 16 MAY 2011

DOI: 10.1002/cjce.20573

Issue

The Canadian Journal of Chemical Engineering

The Canadian Journal of Chemical Engineering

Volume 90, Issue 3, pages 785–792, June 2012

Additional Information

How to Cite

Dikmen, S., Yilmaz, G., Yorukogullari, E. and Korkmaz, E. (2012), Zeta potential study of natural- and acid-activated sepiolites in electrolyte solutions. Can. J. Chem. Eng., 90: 785–792. doi: 10.1002/cjce.20573

Author Information

  1. 1

    Science Faculty, Department of Physics, Anadolu University, 26470 Eskisehir, Turkey

  2. 2

    Technical Programs, Porsuk Vocational School, Anadolu University, 26470 Eskisehir, Turkey

  3. 3

    Graduate School of Science, Anadolu University, 26470 Eskisehir, Turkey

*Science Faculty, Department of Physics, Anadolu University, 26470 Eskisehir, Turkey.

Publication History

  1. Issue published online: 10 APR 2012
  2. Article first published online: 16 MAY 2011
  3. Manuscript Accepted: 21 FEB 2011
  4. Manuscript Revised: 10 JAN 2011
  5. Manuscript Received: 7 SEP 2010

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Keywords:

  • sepiolite;
  • zeta potential;
  • isoelectric point;
  • acid activation

Abstract

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. © 2011 Canadian Society for Chemical Engineering

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