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

Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Johnston Cliff T. (Department of Agronomy, Purdue University)
Gnanasiri S. Premachandra G.S. (Department of Agronomy, Purdue University)
Publication Information
Journal of the Mineralogical Society of Korea / v.19, no.4, 2006 , pp. 247-258 More about this Journal
Abstract
The characteristics of phosphate adsorption on kaolinite was studied by batch adsorption experiments. The phosphorous contents was measured using UV spectrometer with 820 nm wavelength. The experiment with changing reaction time revealed that fast P adsorption occurred within $0{\sim}12$ hour, whereas slow adsorption reaction began after 12 hour. The adsorption percentage depended on kaolinite amount in phosphate solution. Rotary-shaker enhanced the adsorption percentage up to $11{\sim}15%$. The phosphorous adsorption appears to be insensitive to change in the ionic strength of KCl between 0.01 M and 0.1 M. From this result, we can conclude that phosphate was adsorbed on kaolinite as inner-sphere complexes. However, the ionic strength increased to 1.0 M, adsorption decreased. It suggests that phosphate may be adsorbed as outer-sphere complexes. Phosphate adsorption decreased with increasing pH value, but it is not distinct. The adsorption isotherms were well fitted with the Langmuir equation.
Keywords
kaolinite KGa-1b; phosphate adsorption; batch adsorption experiment; inner-sphere omplex; Langmuir adsorption isotherm;
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