金属キレ-トの利用に関する研究-14-EDTAポリアミド型キレ-ト樹脂の調製とその金属イオン吸着性

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Ethylenediaminetetraacetic acid (EDTA) was treated with diamine (p-phenylenediamine) and two triamines [2, 4, 6-triaminopyrimidine (A) and 1, 2, 4-triaminobenzene (B)] to prepare the polyamides which had chelate-forming ligands and could selectively adsorb (or desorb) heavy metal ions. <BR>The A-resin obtained by the reaction of EDTA-diamine-triamine (A) (10 : 9 : 2/3 in molar ratio) was found to have the minimal bulk specific gravity (0.36) and the maximal water absorbing capacity (225%). The bulk specific gravity increased and the water absorbing capacity decreased with an increase in molar ratio of the triamine. The B-resins obtained by the reaction of EDTA-diamine-triamine (B) had larger bulk specific gravity (0.630.69) and smaller water absorbing capacity (82104%) than those of A-resins. <BR>By comparing IR spectra of the two types of both A and B-resins, one type adsorbed copper ion and the other type adsorbed sodium ion, the carboxylate ion of the former type resin was seen to coordinate to the copper ion. <BR>From the above discussion on IR spectra and from results of pH-titration of both A and B-resins on the aqueous suspension in the presence of copper ion, it was concluded that copper ion was adsorbed by way of chelate-bonding by the resins. <BR>The experiments of the adsorption of 8 metal ions on a B-resin revealed that adsorption capacity was greatly dependent both on the ion species and pH.
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