Author/Authors :
DİKMEN, Sedef Anadolu Üniversitesi - Fen Fakültesi - Fizik Böl, Turkey , ERSOY, Bahri Afyon Kocatepe Üniversitesi - Mühendislik Fakültesi - Maden Müh Böl, Turkey , AKPINAR, Süleymen Afyon Kocatepe Üniversitesi - Mühendislik Fakültesi - Malzeme Bil Müh Böl, Turkey , BİRCAN, Hasan Dumlupınar Üniversitesi - Fen Fakültesi - Fizik Böl, Turkey , ORHUN, Önder Anadolu Üniversitesi - Fen Fakültesi - Fizik Böl, Turkey
Title Of Article :
Electrokinetic Properties of Kaolins Belong to Eskişehir-Mihalıçcık
Abstract :
In this study, two kaolin samples collected from clay deposits in the villages Ahırözü and Üçbaşlı of Mihalıçcık (Eskişehir) have been characterized and their electrokinetic properties in water were investigated. In this scope, zeta potential measurements have been performed to determine the effect of pH, mono-, di- and trivalent electrolyte type and concentrations of these electrolytes on the zeta potential of the two kaolin samples. Isoelectric point of Ahırözü kaolin was determined as ~pH 4.2, while that of Üçbaşlı kaolin was determined as ~pH 3.2. Üçbaşlı kaolin has a more negatively charged surface than Ahırözü kaolin in the pH range of 2-11. This difference probably results from the differences in their mineralogical and chemical contents. However, both of the two kaolin samples showed the similar surface charge behavior against mono-, di- and trivalent electrolytes. Monovalent electrolytes such as NaCl and KCl make the ZP of the kaolins more negative, whereas divalent (CaCl2 and MgCl2) and trivalent (Al(NO3)3 ) electrolytes decreases the ZP as its absolute value. Change in the surface sign of the kaolins from negative to the positive is only possible in the presence of trivalent electrolytes (Al-nitrate) due to specific adsorption of Al3+ cations on the edge surface of the kaolin layers.
NaturalLanguageKeyword :
Kaolin , Kaolinite , Zeta potential , Isoelectric point , Electrolyte
JournalTitle :
Afyon Kocatepe University Journal Of Science and Engineering
