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Adsorption Behavior of I Ions on Minerals for Geologic Disposal of 129I Wastes

  • M. Sazarashi (a1), Y. Ikeda (a1), R. Seki (a2), H. Yoshikawa (a3) and Y. Takashima (a1)...

Abstract

The I adsorption on a modified mineral, which is prepared by impregnating Ag(l) nitrate complex with thiourea(tu) into montmorillonites, have been studied by batch method. The modified mineral was found to adsorb I ions selectively even under the coexistence of Cl ions. The distribution ratio(Kd) is 5000 ml/g under the conditions of initial [I] = 1.0 × 10−5 M(M = mol/dm3), pH = 6.4, and solution/modified mineral = 100 ml/g. It was found that the [Ag(tu)]I precipitates are formed by mixing Nal solution with Ag(l)-tu complex solution, while any precipitates are not formed in addition of NaCl solution, and that anion exchange property of the modified mineral is low. Furthermore, it was confirmed that the [Ag(tu)]I complexes are present in the modified minerals after adsorbing I ions. From these results, the I selective adsorptivity of the modified mineral was considered to be due to the formation of [Ag(tu)]I precipitates within the interlayer region of montmorillonite.

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Adsorption Behavior of I Ions on Minerals for Geologic Disposal of 129I Wastes

  • M. Sazarashi (a1), Y. Ikeda (a1), R. Seki (a2), H. Yoshikawa (a3) and Y. Takashima (a1)...

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