Electrokinetic Properties of Kaolins Belong to Eskişehir-Mihalıçcık

Year 2011, Volume: 11 Issue: 2, 9 - 18, 01.08.2011

Sedef Dikmen Bahri Ersoy Süleymen Akpınar Hasan Bircan , Önder Orhun

Abstract

Keywords

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Eskişehir-Mihalıçcık Kaolenlerinin Elektrokinetik Özellikleri

Abstract

Bu çalışmada, Eskişehir-Mihalıçcık ilçesi Ahırözü ve Üçbaşlı köylerindeki kil yataklarından temin edilen kaolen numuneleri karakterize edilerek, su içerisinde elektrokinetik özellikleri incelenmiştir. Bu kapsamda, her iki kaolen numunesinin de pH’ya, tek, çift ve üç değerlikli elektrolit türüne ve bu elektrolitlerin konsantrasyonuna bağlı olarak zeta potansiyel (ZP) ölçümleri gerçekleştirilmiştir. Ahırözü kaoleninin sıfır yük noktası ~pH 4,2 iken, Üçbaşlı kaoleninin sıfır yük noktası ~pH 3,2 olarak belirlenmiştir. Çalışılan 2-11 pH aralığında Üçbaşlı kaoleninin, Ahırözü kaolenine göre daha negatif yüke sahip olduğu belirlenmiştir. Bu farklılık kaolen numunelerinin mineralojik ve kimyasal bakımdan farklılığından kaynaklanmaktadır. Ancak her iki yörenin kaoleni de, farklı elektrolitler varlığında benzer yük davranışı sergilemiştir. NaCl ve KCl gibi tek değerlikli elektrolitler kaolenlerin zeta potansiyelini negatif yönde artırırken, bunun aksine iki (CaCl ve MgCl2) ve üç (Al(NO3)3) değerlikli elektrolitler zeta potansiyeli (mutlak değer olarak) azaltmıştır. Kaolenlerin yüzey işaretinin negatiften pozitife dönüşebilmesi ise ancak Al(NO3)3 varlığında Al+3 gibi +3 değerlikli katyonların kaolen tabaka kenar yüzeylerine spesifik adsorplanmasıyla mümkün olabilmiştir.

Keywords

Kaolen, Kaolinit, Zeta potansiyel, Sıfır yük noktası, Elektrolit.

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