Studies on the Thermal and Radiolytic Resistance of an Anion Exchanger with Benzimidazole Functional Groups in Nitric Aacid Solution.
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Thermal and radiolytic resistance of AR-01R anion exchanger containing Benzimidazole groups as exchange sites in nitric acid solution has been studied. Changes in its exchange capacity (EC), structure and shape were investigated and compared with those of a commercial Amberlite IRA-900 anion exchanger with quaternary ammonium group. Compared to the IRA-900, the AR-01R anion exchanger showed significantly higher thermal resistance and its decrease in EC was less than 10% after immersion in 9 mol⋅dm<SUP>-3</SUP> HNO<SUB>3</SUB> solution for 72 h. On the other hand, it was found that the EC decrease of these two anion exchangers induced by γ-ray irradiation was almost the same; their EC decreased by 20-25% after irradiation in 9 mol⋅dm<SUP>-3</SUP> HNO<SUB>3</SUB> solution at room temperature with absorption dose of 3.0 MGy. The change of the strong-base benzimidazole group to weak-base benzimidazole group in AR-01 was found to be the main damage by heat and γ-ray irradiation.
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