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Phosphate Desorption of Kaolinite KGa-1b (Source Clay)  

Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Kim, Soo-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Choo, Chang-Oh (Department of Earth and Environmental Sciences, Andong National University)
Do, Jin-Young (School of Cultural Assets, Gyeongju University)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.4, 2009 , pp. 289-295 More about this Journal
Abstract
The characteristics of phosphate desorption on kaolinite was studied by batch adsorptiondesorption experiments. Desorption procedure was carried out through sequential extraction method at pH 4. The phosphorous contents were measured using UV-VIS-IR spectrophotometer with 820 nm wavelength. The adsorption-desorption reaction of P on kaolinite was irreversible, and most of adsorbed P on kaolinite were not easily dissolved to aqueous solution, but may might be fixed on kaolinite surface. The desorption isotherms were well fitted with the Freundlich and Temkin equations in the case of short reaction and long reaction time, respectively. The desorption reaction was divided into the early fast reaction and the later slow reaction. The percentage of desorption generally decreased with increasing adsorbed P concentration and increasing desorption reaction time.
Keywords
kaolinite KGa-1b; phosphate adsorption-desorption; sequential extraction method; phosphate fixation; Freundlich adsorption isotherm; Temkin adsorption isotherm;
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Times Cited By KSCI : 2  (Citation Analysis)
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