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2017 ; 7
(ä): 43503
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Complexation of Manganese with Glutarimidedioxime: Implication for Extraction
Uranium from Seawater
#MMPMID28266579
Xie X
; Tian Y
; Qin Z
; Yu Q
; Wei H
; Wang D
; Li X
; Wang X
Sci Rep
2017[Mar]; 7
(ä): 43503
PMID28266579
show ga
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.