Effect of gamma irradiation on ammonium ion production and ion exchange capacity of pyridinium-type anion exchange resin
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Radiolysis of pyridinium-type exchange resin has been investigated by gamma-ray irradiation. This study focused on the effect of absorbed doses, pH and NO3− concentrations on the NH4+ concentrations and the changes of ion exchange capacity (IEC) after irradiation. It was found that hydrated electron could destroy the resin to generate pyridine and polymeric phenacyl radical, and pyridine was further degraded to NH4+. Test results of IEC showed 2% ion exchange groups were lost from resin in 5 mol/L HNO3 at 100 kGy absorbed dose. Adsorption efficiency of irradiated resin under the absorbed dose of 100 kGy for TcO4− was 94.3%.
KeywordsGamma radiolysis Pyridinium-type anion exchange resin Ammonium ion Ion exchange capacity 99Tc adsorption
Thanks to the National Natural Science Foundation of China (Grant No. 11675103, 11975152, 91226111) for support.
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