Immobilization of $^{129}$I in nuclear waste glass matrixes synthesized under high-pressure conditions: an experimental study - Archive ouverte HAL
Article Dans Une Revue Journal of Materials Chemistry A Année : 2021

Immobilization of $^{129}$I in nuclear waste glass matrixes synthesized under high-pressure conditions: an experimental study

Résumé

There is major environmental interest in finding a sustainable solution to immobilize 129I, a by-product of the nuclear industry. The use of aluminoborosilicate glasses represents a good compromise. However, this solution does not appear adequate for 129I owing to its volatility at high temperature during the vitrification process. In the present work, we use a high-pressure (1.5 GPa) apparatus to synthesize I-rich aluminoborosilicate glasses. We show that the use of high-pressure conditions enhances the I solubility in glasses by several orders of magnitude as compared to 1 bar synthesis, with I solubility up to 5.7 mol%. We observed that I is more solubilized in Na-rich as compared to Ca-rich glass. Investigation of the I speciation using XPS also reveals that I solubility in glasses is much higher as I dissolves as I5+ in comparison to I−. Our work shows that using high-pressure appears to be a reliable solution for dissolving a large quantity of I within the structure of aluminoborosilicate glasses for the conditioning of nuclear waste. We also demonstrate that the oxidized I waste form should be employed to greatly increase I solubility in nuclear waste glasses. Therefore, it represents a potential pathway for solving the immobilization of 129I produced by anthropic nuclear activity.
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Dates et versions

hal-04339316 , version 1 (13-12-2023)

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Yann Morizet, Jonathan Hamon, Carole La, Valentin Jolivet, Tomo Suzuki-Muresan, et al.. Immobilization of $^{129}$I in nuclear waste glass matrixes synthesized under high-pressure conditions: an experimental study. Journal of Materials Chemistry A, 2021, 9 (42), pp.23902-23915. ⟨10.1039/d1ta05011g⟩. ⟨hal-04339316⟩
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