高度分離機能を有する無機イオン交換体の開発と応用
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- 槇田 洋二
- 産業技術総合研究所健康工学研究センター
書誌事項
- タイトル別名
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- Development of Advanced Ion-exchanger with High Selectivities toward Alkali-metal Ions
抄録
Some porous crystals of metal oxide with ion-sieve properties have been developed not only for separation of alkali-metal ions but for separation of lithium isotopes. Crystalline (H3O) 8Nb22O59 shows the selectivity of Cs+<<K+, Rb+<Na+<<Li+ in alkaline solution and Li+<<Cs++<<Na+<Rb+<K+ in acidic solution. This separation property allows purification of a lithium chloride solution contaminated with a trace of sodium and potassium ions by a column method, without any loss of lithium ions, promising for recovery of purified lithium chloride for seawater. A protonated NASI-CON (H2.5Zr2Si1.5P1.5O12; sodium super-ionic conductor) with high selectivity for sodium ions exhibits a high lithium isotopic separation factor of 1.036, consistent with a close correlation between the selectivity for sodium ions and the separation factor of lithium isotopes. Interestingly, when an Ag+-type NASICON prepared through Ag+/H+ ion-exchange of the protonated NASICON is subjected to irradiation of electron beams in transmission or scanning electron microscopes, nanowires grow from certain points on the surface of the NASICON. The nanowire is a silver metallic crystal with a face-centered cubic system based on the analysis of energy dispersive X-ray spectroscopy, and reaches more than 120 pm in length, i.e. an aspect ratio of more than 3000.
収録刊行物
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- 日本イオン交換学会誌
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日本イオン交換学会誌 19 (3), 156-165, 2008
日本イオン交換学会
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詳細情報 詳細情報について
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- CRID
- 1390001204434450432
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- NII論文ID
- 130004162504
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- ISSN
- 18843360
- 0915860X
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可