Study on the species distributions of dissolved U(VI) and adsorbed U(VI) on silica surface 용존 6가 우라늄 및 실리카 표면 흡착 6가 우라늄 화학종 분포 연구

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Dissolved hexavalent uranium can exist in the form of several different chemical species. Furthermore, species distributions depend on the pH value of the aqueous solution. Representatively, UO22+, UO2OH+, (UO2)2(OH)22+, and (UO2)3(OH)5+ species coexist in solutions at acidic and circumneutral pH values. When amorphous silica particles are suspended in an aqueous solution, the dissolved chemical species are easily adsorbed onto silica surfaces. In this study, it was examined whether the species distribution of the adsorbed U(VI) on a silica surface followed that of the dissolved U(VI) in an aqueous solution. Time-resolved luminescence spectra of three different dissolved species (UO22+, UO2OH+, and (UO2)3(OH)5+) and two different adsorbed species (≡SiO2UO2, ≡SiO2(UO2)OH–, or ≡SiO2(UO2)3(OH)5–) were measured in the pH range 3.5−7.5. The spectral shapes of these chemical species were compared by changing the pH value; consequently, it was confirmed that the species distribution of the adsorbed U(VI) species was different from that of the dissolved U(VI) species.
Publisher
한국방사성폐기물학회
Issue Date
2020-03
Language
Korean
Article Type
Article
Citation

Journal of Nuclear Fuel Cycle and Waste Technology, v.18, no.1, pp.63 - 72

ISSN
1738-1894
DOI
10.7733/jnfcwt.2020.18.1.63
URI
http://hdl.handle.net/10203/276748
Appears in Collection
NE-Journal Papers(저널논문)
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