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Extraction Chemistry of Palladium(II). Mechanism of Antagonistic Synergistic Extraction of Palladium By A 4-Aroyl Derivative of 1-phenyl-3-Methyl-Pyrazolone-5- one and Trialkylamine of High Molecular Weight

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Abstract

The synergistic extraction behavior of PdII, one of the main radioactive fission products in the reprocessing process, from HNO3 solutions with a 4-aroyl derivative of 1-phenyl-3-methyl-pyrazolone-5-one (PMP), a weakly acidic chelating extractant 1-phenyl-3-methyl-4-(2-methoxybenzoyl)-pyrazolone-5-one (HPMMBP), and a trialkylamine of high molecular weight, tri-iso-octylamine (TiOA), has been studied. An obviously antagonistic extraction effect was observed in the extraction system under the given conditions. To understand this phenomenon, a preliminary investigation was performed to explain the mechanism of this reaction. According to the theory of the corresponding solutions (TCS), the association between HPMMBP and TiOA is presented and discussed in the organic phase. An associated species HPMMBP·TiOA formed through hydrogen bonding in a CHCl3 medium might be the main reason why an antagonistic extraction effect occurred. The association constant between HPMMBP and TiOA was calculated to be 0.212 ± 0.03

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Authors and Affiliations

  1. Nuclear Chemistry and Chemical Engineering Center, Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba-ken, 277-0861, Japan

    Anyun Zhang, Guanghui Wanyan & Mikio Kumagai

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  1. Anyun Zhang
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  2. Guanghui Wanyan
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  3. Mikio Kumagai
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Zhang, A., Wanyan, G. & Kumagai, M. Extraction Chemistry of Palladium(II). Mechanism of Antagonistic Synergistic Extraction of Palladium By A 4-Aroyl Derivative of 1-phenyl-3-Methyl-Pyrazolone-5- one and Trialkylamine of High Molecular Weight. Transition Metal Chemistry 29, 571–576 (2004). https://doi.org/10.1023/B:TMCH.0000037532.41519.61

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  • DOI: https://doi.org/10.1023/B:TMCH.0000037532.41519.61

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