Spectroscopic studies on the binding of uranium by brown coal

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · Appl. Spectrosc.; (United States)

DOI:https://doi.org/10.1366/000370278774331053· OSTI ID:6599883

Koglin, E; Schenk, H J; Schwochau, K

Brown coal removes uranium from sea water where it is present mainly as )UO/sub 2/(CO/sub 3/)/sub 3/)/sup 4 -/. The adsorption and binding of uranium is studied by infrared spectroscopy. The spectra of the coal-uranium adducts still exhibit the asymmetric stretching vibration of the uranyl ion, but no CO/sub 3//sup 2 -/ frequencies, suggesting that uranium is retained as UO/sub 2//sup 2 +/. The coal humic acids are shown to be responsible for the decomposition of the carbonato complex. The subsequent uptake of uranium is not a pure cation exchange process since the shift of the asymmetric uranyl stretching frequency from 950 cm/sup -1/ (hydrated UO/sub 2//sup 2 +/) to 89 cm/sup -1/ points to complexation of UO/sub 2//sup 2 +/ by carboxylate groups which act as bidentate ligands.

• Research Organization: Institute of Chemistry, Institute 4 Applied Physical Chemistry, Nuclear Research Centre (KFA),Juelich, Federal Republic of Germany
• OSTI ID: 6599883
• Journal Information: Appl. Spectrosc.; (United States), Journal Name: Appl. Spectrosc.; (United States) Vol. 32:5; ISSN APSPA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ACTINIDE COMPLEXES
ACTINIDES
ADDUCTS
ADSORPTION
BROWN COAL
CARBONACEOUS MATERIALS
COAL
COMPLEXES
ELEMENTS
ENERGY LEVELS
ENERGY SOURCES
EXCITED STATES
FOSSIL FUELS
FUELS
HUMIC ACIDS
HYDROGEN COMPOUNDS
INFRARED SPECTRA
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEAWATER
SORPTION
SPECTRA
UPTAKE
URANIUM
URANIUM COMPLEXES
URANYL COMPLEXES
VIBRATIONAL STATES
WATER