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Calcium-deficient hydroxyapatite as a potential sorbent for strontium

Sekine, Yurina  ; Motokawa, Ryuhei  ; Kozai, Naofumi  ; Onuki, Toshihiko; Matsumura, Daiju  ; Tsuji, Takuya ; Kawasaki, Riku*; Akiyoshi, Kazunari*

A calcium (Ca)-deficient hydroxyapatite was investigated for its potential to remove Sr$$^{2+}$$ from environmentally relevant water. We conducted sorption tests on solutions having Mg$$^{2+}$$ and Ca$$^{2+}$$ as competing cations at the Sr$$^{2+}$$ concentration of 0.05 mmol/L. The Ca-deficient hydroxyapatite maintained its high Sr$$^{2+}$$ sorption ratio: the sorption ratio was above 80% in the presence of Mg$$^{2+}$$ and Ca$$^{2+}$$ in the concentrations between 0.1 to 1.0 mmol/L, whereas stoichiometric hydroxyapatite showed a lower ratio even in the presence of small amounts of Mg$$^{2+}$$ and Ca$$^{2+}$$. The bonding states of Sr$$^{2+}$$ onto the Ca-deficient hydroxyapatite were evaluated by extended X-ray absorption fine structure measurements. The results indicated that there are specific sorption sites in Ca-deficient hydroxyapatite where Sr$$^{2+}$$ could be stably and preferentially immobilized.

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Category:Multidisciplinary Sciences

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