Adsorption and Separation of Several Metal Ions on ResorcinolFormaldehyde Resin, α-Resorcylic Acid-Formaldehyde Resin and the other Chelating Resins

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  • IMAIZUMI Hiroshi
    Department of Applied Chemistry, Faculty of Engineering, Niigata University

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Other Title
  • レソルシノール-ホルムアルデヒド樹脂およびα-レソルシル酸-ホルムアルデヒド樹脂ならびに関連キレート樹脂による金属イオンの吸着と分離
  • レソルシノール‐ホルムアルデヒド樹脂およびα‐レソシル酸‐ホルムアルデヒド樹脂ならびに関連キレート樹脂による金属イオンの吸着と分離

Abstract

In order to elucidate the characteristics of phenol-formaldehyde type resins as chelating ion-exchange resins, resorinol-formaldehyde resin, α-resorcylic acid-formaldehyde resin (α-RA resin) and the other chelating ion-exchange resins of phenol-formaldehyde type were prepared, and their properties for metal ion adsorption were investigated by the equilibrium method and the column method. The apparent ionization constants (pK') were calculated from pH-titration curves of the resins and the values of ion-exchange capacity. The resins were examined on the ionization of their functional groups. In the equilibrium method, all the resins (except for α-RA resin) showed the following selectivity for metal ions:<BR>Pb2+≈Cu2+>>Zn2+≈Ni2+>Ca2+>Mg2+>>K+>Na+<BR>α-RA Resin showed as follows:<BR>Pb2+≈Cu2+>>Ca2+≈Mg2+>>K+>Na+<BR>In the column method, the selectivities of all the resins were similar to those in the equilibrium method. A column made of α-RA resin showed remarkable selectivity in the adsorption of CO2+ and/or Mg2+ from aqueous solution containing much of NaCl and a little of Ca2+ and/or Mg2+. The solution volume, that could be treated by use of α-RA resin column, was much smaller ( =1/7) than that obtained by use of UR-40 resin column. But, those resins can be prepared much more easily than UR-40 resin. Futher, it may be deduced, from pH-titration curves and pK', that the ionization states of functional groups in the resins altered after the monomers were polymerized.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1983 (7), 1075-1080, 1983-07-10

    The Chemical Society of Japan

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