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Effect of particle size on cesium exchange kinetics by K-depleted phlogopite
AbstractCation exchange mechanism and rate of Cs+ exchange were investigated in <2 μm and 20–2 μm particle size fractions of K-depleted phlogopite (Na-phlogopite). The K-depleted phlogopite was prepared from a natural phlogopite by a potassium removal method using sodium tetraphenylborate (NaTPB) at room temperature. X-ray diffraction (XRD) patterns revealed that interlayer K+ ions were completely replaced with sodium ions after the potassium removal treatment. Ion exchange isotherms and kinetics were determined for Na+→Cs+ exchange with two particle size fractions. The isotherms indicated that both particle size fractions showed high selectivity for Cs+. Based on the isotherm tests, ΔGo values of <2 μm and 20–2 μm particle fractions were −6.83 kJ/mol and −7.08 kJ/mol, respectively. Kinetics of Cs exchange revealed that the 20–2 μm particle size fraction of the K-depleted phlogopite took up more Cs+ ions than the <2 μm particle size fraction. Various kinetic models were applied to describe Na+→Cs+ exchange process. Elovich model described the kinetic data of the <2 μm particle size fraction well, while the modified first-order model or parabolic diffusion model described the data of the 20–2 μm particle size fraction well.
Effect of particle size on cesium exchange kinetics by K-depleted phlogopite
AbstractCation exchange mechanism and rate of Cs+ exchange were investigated in <2 μm and 20–2 μm particle size fractions of K-depleted phlogopite (Na-phlogopite). The K-depleted phlogopite was prepared from a natural phlogopite by a potassium removal method using sodium tetraphenylborate (NaTPB) at room temperature. X-ray diffraction (XRD) patterns revealed that interlayer K+ ions were completely replaced with sodium ions after the potassium removal treatment. Ion exchange isotherms and kinetics were determined for Na+→Cs+ exchange with two particle size fractions. The isotherms indicated that both particle size fractions showed high selectivity for Cs+. Based on the isotherm tests, ΔGo values of <2 μm and 20–2 μm particle fractions were −6.83 kJ/mol and −7.08 kJ/mol, respectively. Kinetics of Cs exchange revealed that the 20–2 μm particle size fraction of the K-depleted phlogopite took up more Cs+ ions than the <2 μm particle size fraction. Various kinetic models were applied to describe Na+→Cs+ exchange process. Elovich model described the kinetic data of the <2 μm particle size fraction well, while the modified first-order model or parabolic diffusion model described the data of the 20–2 μm particle size fraction well.
Effect of particle size on cesium exchange kinetics by K-depleted phlogopite
Cho, Yunchul (author) / Komarneni, Sridhar (author)
Applied Clay Science ; 43 ; 401-407
2008-12-05
7 pages
Article (Journal)
Electronic Resource
English
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