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Environmental Engineering Research 2003;8(4): 222-227. DOI: https://doi.org/10.4491/eer.2003.8.4.222
MESUREMENT OF POINT OF ZERO CHARGE OF BENTONITE BY SOLUBILIZATION TECHNIQUE AND ITS DEPENDENCE OF SURFACE POTENTIAL ON pH
Dong-Su Kim
Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Korea
Corresponding Author: Dong-Su Kim ,Tel: +82-2-3277-2394, Fax: +82-2-3277-3275, Email: dongsu@ewha.ac.kr
Received: April 12, 2003;  Accepted: August 12, 2003.
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ABSTRACT
The applicability of bentonite as a pollution-controlling medium has been widely recognized due to its high specific surface area and peculiar molecular structure. Therefore, understanding its interfacial characteristics is essential for a more efficient use of bentonite in relation with environmental application. The aim of this communication is focused on the development of method measuring the point of zero charge of bentonite, which is one of the most critical interfacial factors governing macroscopic behavior of bentonite in aqueous environment, using solubilization technique and its theoretical aspects are discussed. Also, from the measured point of zero charge, an equation which predicting the variation of surface potential of bentonite depending on pH has been derived based on thermodynamic relationship. The results obtained show that point of zero charge of bentonite is established at around pH 8.0 and its dependence of surface potential according to pi I followed the equation of lP„ = (1.472-0.059 pH at 25"C.
Keywords: Bentonite | Point of Zero Charge | Solubilization Technique | Surface Potential | pl l
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