Influence of Differences in Resin-Matrix Structure on Ion-Exchange Adsorption of Trace Amounts of Ag(I), Co(II) and Cr(III)

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概要

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• The influence of differences in resin-matrix structure on the ion-exchange adsorption of trace amounts of Ag(I), Co(II) and Cr(III) was studied by using both macroreticular and gel-type resins.<BR>The results indicate that the rate-determining step of the exchange mechanism of these ions is film diffusion under conditions of finite volume and at an ionic strength of 1×10<SUP>-4</SUP>. The diffusion coefficient decreases with increasing size of the hydrated ions- in the order <I>D</I><SUB>Ag</SUB>> <I>D</I><SUB>Co</SUB>><I>D</I><SUB>Cr</SUB>. It may be said that the faster rate of exchange in the macroreticular resin is due to the larger surface area and pore size of this resin.<BR>Also, in a column system-as opposed to batch operation, it is assumed that the rate-determining step of the exchange reaction is film diffusion. With both resins, the kinetic coefficient β decreases in the order : β<SUB>Ag</SUB>>β<SUB>Co</SUB>>βCr. For the same linear velocity, a higher β-value is obtained with the macroreticular than with the gel-type resin. Consequently, a higher separating efficiency may be expected from the macroreticular resin for concentrating and separating trace amounts of cations from aqueous solution.

• 一般社団法人 日本原子力学会の論文

著者

• WADACHI Yoshiki

  Tokai Research Establishment, Japan Atomic Energy Research Institute

• MATSUZURU Hideo

  Tokai Research Establishment, Japan Atomic Energy Research Institute

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• Influence of Differences in Resin-Matrix Structure on Ion-Exchange Adsorption of Trace Amounts of Ag(I), Co(II) and Cr(III)

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