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Zeta potential study of natural‐ and acid‐activated sepiolites in electrolyte solutions
Author(s) -
Dikmen Sedef,
Yilmaz Gulgun,
Yorukogullari Ertugrul,
Korkmaz Emine
Publication year - 2012
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20573
Subject(s) - sepiolite , electrolyte , electrokinetic phenomena , zeta potential , chemistry , surface charge , thermogravimetry , point of zero charge , bet theory , inorganic chemistry , divalent , specific surface area , differential thermal analysis , analytical chemistry (journal) , nuclear chemistry , chemical engineering , aqueous solution , diffraction , adsorption , chromatography , organic chemistry , raw material , electrode , nanoparticle , engineering , catalysis , physics , optics
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, CaCl 2 , MgCl 2 , NaNO 3 , Na 2 CO 3 , FeCl 3 and Al(NO 3 ) 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