Selective Metal-Ion Adsorptivities of Silica Gel Particles Impregnated with p-Sulfonatocalix[n]arenes (n = 6 and 8) Having Fixed Steric Structure

  • KOGA Masayoshi
    Department of Applied Chemistry, Faculty of Engineering, Sojo University
  • SEKI Shigeki
    Department of Applied Chemistry, Faculty of Engineering, Sojo University
  • NISHIDA Masashi
    Department of Applied Chemistry, Faculty of Engineering, Sojo University
  • YOSHIDA Isao
    Department of Applied Chemistry, Faculty of Engineering, Sojo University

Bibliographic Information

Other Title
  • 立体構造を固定したカリックス[n]アレーン(n=6,8)担持シリカゲル粒子の金属イオン選択吸着性
  • リッタイ コウゾウ オ コテイ シタ カリックス n アレーン n 6 8 タンジ シリカゲル リュウシ ノ キンゾク イオン センタク キュウチャクセイ

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Abstract

Silica gel particles impregnated with the ion associates of water-soluble p- sulfonatocalix[n]arene (n = 6, H6L66−; n = 8, H8L88−) ions and methyltrioctylammonium ion (MTA+), MTA-L6 and MTA-L8, were prepared, and their adsorption properties for some metal ions were examined. The adsorbents that were impregnated in the first place with the ion associates of metal complexes, such as UO22+ or Ti4+, then eluted these metal ions by dilute sulfuric acid, i.e., complex-type adsorbents, indicated large and selective adsorptivities for UO22+ and Ba2+. The supporting condition of the ion associates was also stable. No adsorptivity was observed for the adsorbents prepared by impregnating directly with the ion associates of these calixarenes with MTA+, i.e., the free ligand-type adsorbents. Also, the supporting condition of the ion associates was less stable than those of the complex types in the presence of metal ions. In the former, it was estimated that these calix[n]arenes are fixed in a "cone" structure in which their hydroxyl groups are ordered conveniently for taking specific metal ions. On the other hand, the latter were estimated to consist of "alternate" type calix[n]arenes in which some of the hydroxyl groups are located on opposing sides to make the reaction with metal ion impossible.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 55 (2), 101-107, 2006

    The Japan Society for Analytical Chemistry

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