Uranium reduction on magnetite: Probing for pentavalent uranium using electrochemical methods
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چکیده
منابع مشابه
Selenate and tellurate complexes of pentavalent uranium.
Oxidation of (C(5)Me(5))(2)U([double bond, length as m-dash]N-2,6-(i)Pr(2)-C(6)H(3))(THF) with PhE-EPh yields the corresponding U(V)-chalcogenate complexes (C(5)Me(5))(2)U([double bond, length as m-dash]N-2,6-(i)Pr(2)-C(6)H(3))(EPh) (E = S, Se, Te) in excellent (>90%) isolated yields.
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Pentavalent uranium complexes of the formula U(V)X(2)[N(SiMe(3))(2)](3) (X = F(-), Cl(-), Br(-), N(3)(-), NCS(-)) are accessible from the oxidation of U(III)[N(SiMe(3))(2)](3) through two sequential, one-electron oxidation reactions (halides) and substitution through salt metathesis (pseudohalides). Uranium(v) mixed-halides are also synthesized by successive one-electron oxidation reactions.
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The dramatic decrease in solubility accompanying the reduction of U(VI) to U(IV), producing the insoluble mineral uraninite, has been viewed as a potential mechanism for sequestration of environmental uranium contamination. In the past 15 years, it has been firmly established that a variety of bacteria exhibit this reductive capacity. To obtain an understanding of the microbial metal metabolism...
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Previous work at the University of New Mexico and elsewhere has shown that sulfate-reducing bacteria are capable of reducing uranium from the soluble +6 oxidation state to the insoluble +4 oxidation state. This chemistry forms the basis of a proposed ground water remediation strategy in which microbial reduction would be used to immobilize soluble uranium. One such system would consist of a sub...
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Knowledge of paleo-redox conditions in the Earth's history provides a window into events that shaped the evolution of life on our planet. The role of microbial activity in paleo-redox processes remains unexplored due to the inability to discriminate biotic from abiotic redox transformations in the rock record. The ability to deconvolute these two processes would provide a means to identify envi...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2015
ISSN: 0016-7037
DOI: 10.1016/j.gca.2015.02.014