A multiparametric study on the dissolution of synthetic brannerite

Abstract Brannerite, UTi2O6 is reported to occur in various uraniferous deposits worldwide. Natural brannerite specimens are found in the amorphous state and are usually considered to be refractory to dissolution due to the formation of TiO2 passivation layer. In the present work, brannerite was syn...

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Autores principales:	Hantao Lin, Stéphanie Szenknect, Adel Mesbah, Fabien Baron, Daniel Beaufort, Yann Batonneau, Julien Mercadier, Aurélien Eglinger, Marion Turuani, Anne-Magali Seydoux-Guillaume, Philippe Goncalves, Flavien Choulet, Virginie Chapon, Maurice Pagel, Nicolas Dacheux
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/47229ae7611b4876b675fa6d893dedf4
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spelling	oai:doaj.org-article:47229ae7611b4876b675fa6d893dedf42021-12-02T18:25:00ZA multiparametric study on the dissolution of synthetic brannerite10.1038/s41529-021-00173-62397-2106https://doaj.org/article/47229ae7611b4876b675fa6d893dedf42021-06-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00173-6https://doaj.org/toc/2397-2106Abstract Brannerite, UTi2O6 is reported to occur in various uraniferous deposits worldwide. Natural brannerite specimens are found in the amorphous state and are usually considered to be refractory to dissolution due to the formation of TiO2 passivation layer. In the present work, brannerite was synthesized by wet chemistry route, then characterized prior the development of multiparametric dissolution experiments. The evolution of U and Ti concentrations was followed in 0.1–2 mol/L H2SO4 solutions, for temperatures ranging from 25 to 80 °C, in the presence (or not) of 2.8 g/L of dissolved Fe(III). The dissolution of synthetic brannerite was congruent in the whole experimental domain. The formation of Ti-enriched secondary phase at the surface of the brannerite grains was not evidenced. The dissolution rate constants, activation energies and partial orders of the overall dissolution reaction relative to proton activity were determined in the presence (or absence) of Fe(III). The introduction of Fe(III) in sulfuric acid solutions increased the dissolution rate constant by 5 orders of magnitude and induced significant modifications of the apparent activation energy (from 71 ± 4 to 91 ± 6 kJ/mol) and of the partial order relative to proton activity (from 0.42 ± 0.09 to 0.84 ± 0.08). This study suggested that the uncongruency of the brannerite dissolution and the changes usually observed in the rate-controlling step with temperature could be linked to the loss of the crystal structure in natural samples.Hantao LinStéphanie SzenknectAdel MesbahFabien BaronDaniel BeaufortYann BatonneauJulien MercadierAurélien EglingerMarion TuruaniAnne-Magali Seydoux-GuillaumePhilippe GoncalvesFlavien ChouletVirginie ChaponMaurice PagelNicolas DacheuxNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Hantao Lin Stéphanie Szenknect Adel Mesbah Fabien Baron Daniel Beaufort Yann Batonneau Julien Mercadier Aurélien Eglinger Marion Turuani Anne-Magali Seydoux-Guillaume Philippe Goncalves Flavien Choulet Virginie Chapon Maurice Pagel Nicolas Dacheux A multiparametric study on the dissolution of synthetic brannerite
description	Abstract Brannerite, UTi2O6 is reported to occur in various uraniferous deposits worldwide. Natural brannerite specimens are found in the amorphous state and are usually considered to be refractory to dissolution due to the formation of TiO2 passivation layer. In the present work, brannerite was synthesized by wet chemistry route, then characterized prior the development of multiparametric dissolution experiments. The evolution of U and Ti concentrations was followed in 0.1–2 mol/L H2SO4 solutions, for temperatures ranging from 25 to 80 °C, in the presence (or not) of 2.8 g/L of dissolved Fe(III). The dissolution of synthetic brannerite was congruent in the whole experimental domain. The formation of Ti-enriched secondary phase at the surface of the brannerite grains was not evidenced. The dissolution rate constants, activation energies and partial orders of the overall dissolution reaction relative to proton activity were determined in the presence (or absence) of Fe(III). The introduction of Fe(III) in sulfuric acid solutions increased the dissolution rate constant by 5 orders of magnitude and induced significant modifications of the apparent activation energy (from 71 ± 4 to 91 ± 6 kJ/mol) and of the partial order relative to proton activity (from 0.42 ± 0.09 to 0.84 ± 0.08). This study suggested that the uncongruency of the brannerite dissolution and the changes usually observed in the rate-controlling step with temperature could be linked to the loss of the crystal structure in natural samples.
format	article
author	Hantao Lin Stéphanie Szenknect Adel Mesbah Fabien Baron Daniel Beaufort Yann Batonneau Julien Mercadier Aurélien Eglinger Marion Turuani Anne-Magali Seydoux-Guillaume Philippe Goncalves Flavien Choulet Virginie Chapon Maurice Pagel Nicolas Dacheux
author_facet	Hantao Lin Stéphanie Szenknect Adel Mesbah Fabien Baron Daniel Beaufort Yann Batonneau Julien Mercadier Aurélien Eglinger Marion Turuani Anne-Magali Seydoux-Guillaume Philippe Goncalves Flavien Choulet Virginie Chapon Maurice Pagel Nicolas Dacheux
author_sort	Hantao Lin
title	A multiparametric study on the dissolution of synthetic brannerite
title_short	A multiparametric study on the dissolution of synthetic brannerite
title_full	A multiparametric study on the dissolution of synthetic brannerite
title_fullStr	A multiparametric study on the dissolution of synthetic brannerite
title_full_unstemmed	A multiparametric study on the dissolution of synthetic brannerite
title_sort	multiparametric study on the dissolution of synthetic brannerite
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/47229ae7611b4876b675fa6d893dedf4
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A multiparametric study on the dissolution of synthetic brannerite

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