Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Extraction behaviors of platinum group metals in simulated high-level liquid waste by a hydrophobic ionic liquid bearing an amino moiety

  • Wu, Hao (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Kim, Seong-Yun (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Takahashi, Tadayuki (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Oosugi, Haruka (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Ito, Tatsuya (Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University) ;
  • Kanie, Kiyoshi (Institute of Multidisciplinary Research for Advanced Materials, Tohoku University)
  • Received : 2020.07.13
  • Accepted : 2020.09.28
  • Published : 2021.04.25
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Abstract

A hydrophobic ionic liquid including an amino moiety ([DiOcAPmim][NTf2]) 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 [HNO3] = 2.05 M. When [HNO3]< 1 M, the extraction percentage of Pd(II), Ru(III), Rh(III) were all above 80%. When [HNO3] reached 2 M, all of the extraction percentage decreased and in an order of Pd(II)>Ru(III)>Rh(III). When [HNO3]> 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][NTf2] showed a better preference towards Pd(II) under the interference of various other co-existing metal ions.

Keywords

References

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