多孔質ガラスによるニッケルとコバルトのイオン交換分離に関する基礎研究

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This paper described the adsorption characteristics of nickel amd cobalt on porous glass and the separation of these metal using a column packed with porous glass. The adsorption equilibrium experiment showed that adsorption mechanism was not ion exchange between ammonium ion adsorbed on solid and metal ion in liquid, but ligand substitution between ammonia ligand and surface silanol group. A column packed with porous glass, which was conditioned with 1M-ammonium hydroxide prior to experiment, adsorbed metal ions completely from mixed solution of nickel chloride and cobalt chloride. When this column was developed by 0.6 M-ammonium chloride at a velocity of 1 ml/min, the absorbed metals were simultaneously eluted under pH 5. Since the elution of adsorbed metals was accelerated by the ammonia formed at pH 8, the separation of nickel and cobalt was not improved. Almost perfect separation was accomplised under the eluting condition at pH 6 and at a velocity of 0.1 ml/min.