Kinetics of Oleate Adsorption at a Nigerian Hematite-Water Interface.
The rate of adsorption of oleate soap onto a Nigerian hematite in an aqueous medium was determined from 29 to 60 degrees C using the differential analysis method. The activation energy and frequency factor were determined at 57.1 kJ mol(-1) K(-1) and 4.0 x 10(3) liter mol(-1) min(-1), respectively, indicating that the chemical processes are the slow, rate-determining step and that the reaction proceeds relatively fast. The adsorption isotherm was the Langmuir type: chemisorption was considered the dominant mode of adsorption. The desorption isotherm indicated a minor contribution of physical adsorption to the overall adsorption process. Copyright 1999 Academic Press.
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School of Science, Federal University of Technology, Owerri, Imo State, Nigeria
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