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Citrate Enhanced Uranyl Adsorption on Goethite: An EXAFS Analysis by George Redden; John Bargar; Rizlan Bencheikh-Latmani is a Chemistry article available to read on EtoBox.

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## Citric acid promotes the adsorption of uranyl (U(VI) as UO 2+ 2 ) on goethite (α-FeOOH) at pH ≤ 5. Enhanced adsorption does not appear to follow a simple stoichiometric relationship between total citrate and total uranyl. An excess of citric acid relative to uranyl, or a high concentration of surface-bound citrate is required. An extended X-ray absorption fine structure spectroscopy (EXAFS) study was conducted to help understand the surface interactions between citrate, UO 2+ 2 , and goethite between pH 3.5 and pH 5.5. Two principal surface species were found to be necessary and sufficient to describe the uranyl EXAFS spectra for the range of adsorbed citrate concentrations studied. (The possibility of additional minor surface species has not been eliminated, but inherent uncertainties in the data do not permit their clear identification.) One species is identified as an inner-sphere, uranyl-goethite complex, which exists at pH 5.5 in the absence of citrate. A second species is interpreted to be an adsorbed uranyl + citrate complex, which displaces the binary uranyl-goethite complex as the concentration of adsorbed citrate increases. The EXAFS spectra from samples with intermedi

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Author

George Redden; John Bargar; Rizlan Bencheikh-Latmani

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2001

Language

EN

Field

Chemistry (Physical Sciences)