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http://dx.doi.org/10.7733/jnfcwt.2020.18.4.497

Excitation and Emission Properties of Adsorbed U(VI) on Amorphous Silica Surface  

Jung, Euo Chang (Korea Atomic Energy Research Institute)
Kim, Tae-Hyeong (Korea Atomic Energy Research Institute)
Kim, Hee-Kyung (Korea Atomic Energy Research Institute)
Cho, Hye-Ryun (Korea Atomic Energy Research Institute)
Cha, Wansik (Korea Atomic Energy Research Institute)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.18, no.4, 2020 , pp. 497-508 More about this Journal
Abstract
In the geochemical field, the chemical speciation of hexavalent uranium (U(VI)) has been widely investigated by performing measurements to determine its luminescence properties, namely the excitation, emission, and lifetime. Of these properties, the excitation has been relatively overlooked in most time-resolved laser fluorescence spectroscopy (TRLFS) studies. In this study, TRLFS and continuous-wave excitation-emission matrix spectroscopy are adopted to characterize the excitation properties of U(VI) surface species that interact with amorphous silica. The luminescence spectra of U(VI) measured from a silica suspension and silica sediment showed very similar spectral shapes with similar lifetime values. In contrast, the excitation spectra of U(VI) measured from these samples were significantly different. The results show that distinctive excitation maxima appeared at approximately 220 and 280 nm for the silica suspension and silica sediment, respectively.
Keywords
Time-resolved laser fluorescence spectroscopy (TRLFS); Excitation-emission matrix (EEM) spectroscopy; Adsorption; Hexavalent uranium; Amorphous silica;
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