金属キレートの利用に関する研究 (第16報)

EDTAエポキシ系キレート樹脂の調製とその金属イオン吸着性

抄録

Six chelate-resins of which main-chains were composed of the polyesters from ethylenediamine tetraacetic acid (EDTA) and 2, 2-bis [4- (2, 3-epoxypropyloxy) phenyl] propane were prepared. The main-chain was cross-linked by EDTA dianhydride or by diethylenetriaminepentaacetic acid (DTPA) dianhydride in three different molar-ratios. The chelate-resins obtained were designated E-resins, and D-resins, respectively.
These chelate-resins prepared had the remarkable pH-dependence on the adsorptivity of metal ions. A copper ion was adsorbed on E-and D-resins up to 0.55mmol/g even at pH 1, whereas Ca²⁺, Mg²⁺, Mn²⁺ and Cr³⁺ were negligibly adsorbed under the same condition. The maximal Cu²⁺-adsorption capacities of both E- and D-resins were found at around pH 4. The Cu²⁺-adsorption capacities increased with an increase of the copper concentration up to at 0.06M and kept constant to be 1.4mmol/g at the copper concentration above 0.06M. The amount, 1.4mmol/g, corresponds to about 80% of the theoretical value which is calculated by assuming that all chelating ligands of EDTA-and DTPA moiety in the resin form the (1 : 1) chelate with the metal ion.