Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates Full article
| Journal |
Doklady Earth Sciences
ISSN: 1028-334X , E-ISSN: 1531-8354 |
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| Output data | Year: 2025, Volume: 524, Number: 1, Article number : 10, Pages count : 8 DOI: 10.1134/s1028334x25605929 | ||||||
| Tags | uranium, oxidation state, technogenic solutions, precipitation, calcium phosphates | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | FWUR-2024-0042 |
| 2 | Ministry of Science and Higher Education of the Russian Federation | FWZN-2022-0025 (122041400237-8) |
Abstract:
Groundwater purification from U compounds near sludge storages of nuclear fuel cycle (NFC) facilities by precipitation of minerals of the apatite group and/or directly of U (IV, VI) phosphates is a promising method. In laboratory experiments, we demonstrated the efficient U immobilization in solid Ca phosphates during neutralization of natural and technogenic wastewater from two nuclear plants by Na2HPO4 solutions with the removal of more than 98% U. The analysis of sediment by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM-EDS) confirms the formation of hydroxylapatite and brushite CaH(PO4)⋅(H2O)2. The XPS identification of the U oxidation state revealed the presence of U4+, U5+, and U6+ with the U5+ amount of up to 30–35 at %. Our study is the first demonstrating possible U immobilization in three oxidation states from neutral technogenic and model solutions, which was produced at normal temperature without redox manipulations and the presence of biota. Similar results were previously obtained during the oxidation of UO2 to UO2 + x only. At the same time, a series of thermodynamic calculations showed that the precipitation of U(VI) under atmospheric conditions (an open system) can lead to the formation of surface minerals with evident hyperstoichiometry including U4O9 and U3O8.
Cite:
Gaskova O.L.
, Boguslavsky A.E.
, Sofronova S.M.
, Saraev A.A.
, Vinokurov Z.S.
Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates
Doklady Earth Sciences. 2025. V.524. N1. 10 :1-8. DOI: 10.1134/s1028334x25605929 WOS Scopus OpenAlex publication_identifier_short.sciact_skif_identifier_type
Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates
Doklady Earth Sciences. 2025. V.524. N1. 10 :1-8. DOI: 10.1134/s1028334x25605929 WOS Scopus OpenAlex publication_identifier_short.sciact_skif_identifier_type
Dates:
| Submitted: | Feb 25, 2025 |
| Accepted: | May 19, 2025 |
| Published print: | Aug 2, 2025 |
| Published online: | Aug 2, 2025 |
Identifiers:
| Web of science: | WOS:001543137700006 |
| Scopus: | 2-s2.0-105012464096 |
| OpenAlex: | W4412857231 |
| publication_identifier.sciact_skif_identifier_type: | 4033 |
Citing:
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