Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.
Southwestern Institute of Physics, Chengdu, Sichuan 610041, China.
Sci Rep. 2017 Mar 7;7:43503. doi: 10.1038/srep43503.
The molecule of glutaroimidedioxime, a cyclic imidedioxime moiety that can form during the synthesis of the poly(amidoxime)sorbent and is reputedly responsible for the extraction of uranium from seawater. Complexation of manganese (II) with glutarimidedioxime in aqueous solutions was investigated with potentiometry, calorimetry, ESI-mass spectrometry, electrochemical measurements and quantum chemical calculations. Results show that complexation reactions of manganese with glutarimidedioxime are both enthalpy and entropy driven processes, implying that the sorption of manganese on the glutarimidedioxime-functionalized sorbent would be enhanced at higher temperatures. Complex formation of manganese with glutarimidedioxime can assist redox of Mn(II/III). There are about ~15% of equilibrium manganese complex with the ligand in seawater pH(8.3), indicating that manganese could compete to some degree with uranium for sorption sites.
戊二酰亚胺二肟分子是一种环状亚胺二肟部分，它可以在聚（酰胺肟）吸附剂的合成过程中形成，据称负责从海水中提取铀。本文通过电位法、量热法、ESI-质谱、电化学测量和量子化学计算研究了水溶液中锰（II）与戊二酰亚胺二肟的络合作用。结果表明，锰与戊二酰亚胺二肟的配位反应是焓和熵驱动的过程，这意味着在较高温度下，锰在戊二酰亚胺二肟功能化吸附剂上的吸附会增强。锰与戊二酰亚胺二肟的络合形成可以辅助 Mn(II/III)的氧化还原。在海水 pH（8.3）下，约有~15%的平衡锰与配体形成配合物，这表明锰在某种程度上可以与铀竞争吸附位点。
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