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Author Im, Hee-Jung ♦ Park, Kyoung Kyun ♦ Jung, Euo Chang
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ACTINIDES ♦ ADSORPTION ♦ AMORPHOUS STATE ♦ AQUEOUS SOLUTIONS ♦ CAPACITY ♦ CONCENTRATION RATIO ♦ EUROPIUM COMPLEXES ♦ GROUND WATER ♦ LIFETIME ♦ LUMINESCENCE ♦ MOBILITY ♦ MOLECULES ♦ SILICA ♦ SURFACES ♦ TITANIUM OXIDES ♦ URANIUM COMPLEXES
Abstract Highlights: • Enhanced adsorption of Eu(III) and U(VI) onto TiO{sub 2}-coated silica. • Enhanced Eu(III) luminescence and lifetime on TiO{sub 2}-coated silica. • Energy transfer from TiO{sub 2} of TiO{sub 2}-coated silica to Eu(III) in solutions. - Abstract: To determine the effects of TiO{sub 2} on the adsorption of actinides onto mineral surfaces in groundwater, silica was partially coated with TiO{sub 2}, and Eu(III) and U(VI) were individually adsorbed from separate 0.1 mM concentration solutions. The TiO{sub 2}-coated silica showed higher Eu(III) and U(VI) adsorption capacities for increasing amounts of TiO{sub 2} coated on the silica surfaces, and thus the existence of TiO{sub 2} can decrease the mobility of Eu(III) and U(VI) contaminants. In luminescence studies, it was found that TiO{sub 2} considerably enhanced the luminescence of the adsorbed Eu(III) indicating that TiO{sub 2}–Eu(III) forms surface complexes which may decrease the number of water molecules at the inner sphere of Eu(III), but this was not observed for U(VI). An energy transfer from the TiO{sub 2} to the Eu(III) was confirmed in this case of amorphous TiO{sub 2}-coated silica in Eu(III) solutions, and an increase of the luminescence lifetime of Eu(III) for increasing concentrations of coated TiO{sub 2} was also observed.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2014-10-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 58


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