| 摘要 |
PROBLEM TO BE SOLVED: To provide a method in which exchangeable ions A contained in fine particles are efficiently exchanged with ions B other than the ions A without mixing the counter ions of the ions B into an ion-exchange system. SOLUTION: A dispersion comprising the fine particles having ions A, a polymer, and a solvent is brought into contact with an ion-exchange resin having ions B or with a solution containing the ions B via a semipermeable membrane. A molding containing fine particles having the ions A is brought into contact with the dispersion of an ion-exchange resin having the ions B or with a solution containing the ions B via a semipermeable membrane.
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