Study on separation ability of divalent metal ions with β-diketone on octadecyl-group bonded silica gel

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  • IIYAMA Masamitsu
    Nomura Micro Science Co., Ltd. Functional Product Group Technical Development Div.

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  • β-ジケトンを付加したケイ酸塩を用いた二価金属イオン間の分離能に関する研究
  • 受賞論文(平成20年度[日本イオン交換学会]進歩賞) β-ジケトンを付加したケイ酸塩を用いた二価金属イオン間の分離能に関する研究
  • ジュショウ ロンブン ヘイセイ 20ネンド ニホン イオン コウカン ガッカイ シンポショウ ベータ ジケトン オ フカシタ ケイサンエン オ モチイタ 2カ キンゾク イオンカン ノ ブンリノウ ニ カンスル ケンキュウ
  • Study on separation ability of divalent metal ions with ^|^beta;-diketone on octadecyl-group bonded silica gel

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Abstract

The investigation looked at the separation of divalent metal ions in an aqueous solution. The adsorption materials for the metal ions were synthesized with β-diketones retained on the octadecyl-group bonded to silica gel (C18). The β-diketones such as TTA and BFA were used as reagents for separation of the metal ions. The reaction ability of these materials (TTA-, BFA-C18) was evaluated by solid-liquid distribution behavior. It was found that these metal ions were adsorbed on these materials at pH 2-6 by an ion-exchange reaction, and their selectivity series was Cu2+>Ni2+>Co2+≥Zn2+>Mn2+. The mutual separation ability was found to be better than that of reported inorganic ion-exchangers such as dihydrogen tetratitanate hydrate fibers. BFA-C18 had an especially high selectivity for Cu2+.<br> Then, the adsorption behavior of Cu2+, Cd2+ and Pb2+ in aqueous solution was examined by same method. The reaction behavior of same tendency to divalent transition metal ions was obtained. BFA-C18 has better mutual selectivity for Pb2+-Cd2+ than that of the TTA-C18. In contrast, TTA-C18 shows good separation ability between Cu2+-Pb2+. The synthesized materials have high mutual separation ability of the metal ions.<br>

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