title: Complexation of Manganese with Glutarimidedioxime: Implication for Extraction Uranium from Seawater.
abstract: 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.
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Xie
authors.affiliation: Southwestern Institute of Physics, Chengdu, Sichuan 610041, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Institute of Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Qin
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.
authors.forename: Qianhong
authors.initials: Q
authors.lastname: Yu
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.
authors.forename: Hongyuan
authors.initials: H
authors.lastname: Wei
authors.affiliation: 4CAS Key Laboratory of Nuclear Radiation and Nuclear Energy Techniques, and Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
authors.forename: Dongqi
authors.initials: D
authors.lastname: Wang
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.
authors.forename: Xingliang
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China.|Institute of Materials, China Academy of Engineering Physics, Mianyang 621900, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang