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Phosphate Adsorption-Desorption of Kaolinite KGa-2 (Source Clay)  

Cho, Hyen-Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Choi, Jae-Ho (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Moon, Dong-Hyuk (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)
Do, Jin-Youn (School of Cultural Assets, Gyeongju University)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.2, 2008 , pp. 117-127 More about this Journal
Abstract
The characteristics of phosphate adsorption-desorption on kaolinite was studied by batch adsorption experiments and detailed adsorbed state of phosphate on kaolinite surface was investigated using ATR-FTIR (Attenuated Total Reflectance-Fourier Transform Infrared) spectroscopy. The phosphorous contents were measured using UV-VIS-IR spectrophotometer with 820 nm wavelength. The adsorbed P was generally increased with increasing pH value in the range of pH 4 to pH 9, however it is not distinct. Moreover the adsorbed P was significantly changed with different initial phosphate concentration. The adsorption isotherms were well fitted with the Langmuir equation, Temkin equation, and Freundlich equation in descending order. The maximum Langmuir adsorption capacity of kaolinite KGa-2 is 232.5 ($204.1{\sim}256.5$) mg/kg and has very higher value than that of kaolinite KGa-1b. Most of adsorbed phosphate on kaolinite were not easily desorbed to aqueous solution, but might fixed on kaolinite surface. However it needs further research about the exact desorption experiment. It was impossible to recognize phosphorous adsorption bands on kaolinite in ATR-FTIR spectrum from kaolinite bands themselves, because the absorption peaks of phosphorous have very similar positions with those of kaolinite, and the intensities of the former were very weak in comparison with those of the latter.
Keywords
kaolinite KGa-2; phosphate adsorption-desorption; batch adsorption experiment; Langmuir adsorption isotherm; ATR-FTIR spectroscopy;
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