Abstract
Stability of ionic liquid 1-methyl-3-butylimidazolium hexafluorophosphate ([bmim][PF 6]) in the presence of nitric acid (HNO 3) was investigated under γ-radiation. It was found that incorporating HNO 3 into [bmim][PF 6] obviously inhibits the radiation-induced darkening of [bmim][PF 6] due to the oxidizability of HNO 3. More detailed UV–vis analysis reveals linear decrease of light absorbance of irradiated [bmim][PF 6]/HNO 3 with increasing concentration of HNO 3 to 2 mol L −1, which is consistent with the color evolution observed by the naked eye. FTIR and NMR measurements indicates that HNO 3 slightly accelerates the radiolysis of [bmim][PF 6] at high dose (550 kGy), the amount of nonvolatile radiolysis products, however, is less than 1 mol%.
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