| 摘要 |
PURPOSE:To efficiently remove the fluorine complex ion dissolved in water, by using an adsorbent comprising one or more of hydrated oxide or fluoride of one or more of a metal selected from a specific metal element group. CONSTITUTION:A metal element is selected from Sc, Y, La and Ac of the Group IIIB of the Periodic Table and used as the mixture with one or more of an element selected from a group consisting of Zr and Hf. An adsorbent is prepared as hydrated oxide or fluoride of these metal elements and contacted with fluorine dissolved water with pH of 7 or less to selectively adsorb a fluorine complex ion with high efficiency. The adsorbent can be easily regenerated by contacting the adsorbed fluorine thereof with an alkaline aqueous solution with pH of 8-14 to desorb the same and can be reused.
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