A NOVEL METHOD FOR THE DETERMINATION OF THE POINT OF ZERO NET PROTON CHARGE OF COLLOIDAL KAOLINITE IN AQUEOUS SOLUTIONS

Lingyun Liu, Fanfei Min, Fangqin Lu, Mingxu Zhang and Shaoxian Song
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Lingyun Liu: School of Materials Science and Engineering, Anhui University of Science and Technology, Shungeng Road 168, Huainan, Anhui 232001, P. R. China
Fanfei Min: School of Materials Science and Engineering, Anhui University of Science and Technology, Shungeng Road 168, Huainan, Anhui 232001, P. R. China
Fangqin Lu: School of Materials Science and Engineering, Anhui University of Science and Technology, Shungeng Road 168, Huainan, Anhui 232001, P. R. China
Mingxu Zhang: School of Materials Science and Engineering, Anhui University of Science and Technology, Shungeng Road 168, Huainan, Anhui 232001, P. R. China
Shaoxian Song: #x2020;Instituto de Metalurgia, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 550, San Luis Potosi, C.P. 78210, Mexico

Surface Review and Letters (SRL), 2016, vol. 23, issue 04, 1-8

Abstract: In this work, a novel method to determine the point of zero net proton charge (PZNPC) of colloidal kaolinite in aqueous solutions was presented through the measurement of zeta potential of the particles in various concentrations of NaCl solution and the mathematic regression of the zeta potential versus pH curves. This method is based on the observation that there are two common intersection points (CIP) in the two curves of zeta potential versus pH of colloidal kaolinite with a low and a high NaCl concentration. The observation might be attributed to that NaCl would compress the electric double layer of kaolinite particles and affect the efficiency of the protonation/deprotonation of the HD-faces. The experimental result showed that the PZNPC of kaolinite is 5.37.

Keywords: Kaolinite; point of zero net proton charge; zeta potential; aqueous NaCl solution (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X16500232

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