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Wu, Hao,Kim, Seong-Yun,Takahashi, Tadayuki,Oosugi, Haruka,Ito, Tatsuya,Kanie, Kiyoshi Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.4
A hydrophobic ionic liquid including an amino moiety ([DiOcAPmim][NTf<sub>2</sub>]) was synthesized. Its extraction behaviors towards Pd(II), Ru(III), Rh(III) were investigated in nitric acid aqueous solution as a function of contact time, effect of concentration of nitric acid, effect of temperature, and effect of co-existing metal ions. The extraction kinetics of Pd(II) was fairly fast and extraction equilibrium can be attained within only 5 min under the [HNO<sub>3</sub>] = 2.05 M. When [HNO<sub>3</sub>]< 1 M, the extraction percentage of Pd(II), Ru(III), Rh(III) were all above 80%. When [HNO<sub>3</sub>] reached 2 M, all of the extraction percentage decreased and in an order of Pd(II)>Ru(III)>Rh(III). When [HNO<sub>3</sub>]> 2 M, the extraction performance gradually recovered. The effect of temperature can slightly affect the extraction performance of Pd(II). Furthermore, in simulated high-level liquid waste, [DiOcAPmim][NTf<sub>2</sub>] showed a better preference towards Pd(II) under the interference of various other co-existing metal ions.