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231225s2022 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.1c03179
|2 doi
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|a pubmed24n1123.xml
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|a (DE-627)NLM336986173
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|a (NLM)35166554
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Foster, Chris
|e verfasserin
|4 aut
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|a Hydrotalcite Colloidal Stability and Interactions with Uranium(VI) at Neutral to Alkaline pH
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|c 2022
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 16.07.2022
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In the United Kingdom, decommissioning of legacy spent fuel storage facilities involves the retrieval of radioactive sludges that have formed as a result of corrosion of Magnox nuclear fuel. Retrieval of sludges may re-suspend a colloidal fraction of the sludge, thereby potentially enhancing the mobility of radionuclides including uranium. The colloidal properties of the layered double hydroxide (LDH) phase hydrotalcite, a key product of Magnox fuel corrosion, and its interactions with U(VI) are of interest. This is because colloidal hydrotalcite is a potential transport vector for U(VI) under the neutral-to-alkaline conditions characteristic of the legacy storage facilities and other nuclear decommissioning scenarios. Here, a multi-technique approach was used to investigate the colloidal stability of hydrotalcite and the U(VI) sorption mechanism(s) across pH 7-11.5 and with variable U(VI) surface loadings (0.01-1 wt %). Overall, hydrotalcite was found to form stable colloidal suspensions between pH 7 and 11.5, with some evidence for Mg2+ leaching from hydrotalcite colloids at pH ≤ 9. For systems with U present, >98% of U(VI) was removed from the solution in the presence of hydrotalcite, regardless of pH and U loading, although the sorption mode was affected by both pH and U concentrations. Under alkaline conditions, U(VI) surface precipitates formed on the colloidal hydrotalcite nanoparticle surface. Under more circumneutral conditions, Mg2+ leaching from hydrotalcite and more facile exchange of interlayer carbonate with the surrounding solution led to the formation of uranyl carbonate species (e.g., Mg(UO2(CO3)3)2-(aq)). Both X-ray absorption spectroscopy (XAS) and luminescence analysis confirmed that these negatively charged species sorbed as both outer- and inner-sphere tertiary complexes on the hydrotalcite surface. These results demonstrate that hydrotalcite can form pseudo-colloids with U(VI) under a wide range of pH conditions and have clear implications for understanding the uranium behavior in environments where hydrotalcite and other LDHs may be present
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|a Journal Article
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|a Shaw, Samuel
|e verfasserin
|4 aut
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|a Neill, Thomas S
|e verfasserin
|4 aut
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|a Bryan, Nick
|e verfasserin
|4 aut
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|a Sherriff, Nick
|e verfasserin
|4 aut
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|a Natrajan, Louise S
|e verfasserin
|4 aut
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|a Wilson, Hannah
|e verfasserin
|4 aut
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|a Lopez-Odriozola, Laura
|e verfasserin
|4 aut
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|a Rigby, Bruce
|e verfasserin
|4 aut
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|a Haigh, Sarah J
|e verfasserin
|4 aut
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|a Zou, Yi-Chao
|e verfasserin
|4 aut
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|a Harrison, Robert
|e verfasserin
|4 aut
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|a Morris, Katherine
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 38(2022), 8 vom: 01. März, Seite 2576-2589
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:38
|g year:2022
|g number:8
|g day:01
|g month:03
|g pages:2576-2589
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|u http://dx.doi.org/10.1021/acs.langmuir.1c03179
|3 Volltext
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|d 38
|j 2022
|e 8
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|c 03
|h 2576-2589
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