Lead-vanadate sorbents for iodine trapping and their conversion into an iodoapatite-based conditioning matrix - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Frontiers in Chemistry Année : 2022

Lead-vanadate sorbents for iodine trapping and their conversion into an iodoapatite-based conditioning matrix

R. Pénélope
  • Fonction : Auteur
L. Campayo
  • Fonction : Auteur
M. Fournier
  • Fonction : Auteur
A. Gossard
  • Fonction : Auteur
A. Grandjean
  • Fonction : Auteur

Résumé

New lead-vanadate based sorbents were synthesized with the aim to entrap and confine gaseous iodine in off-gas streams coming from reprocessing facilities of spent nuclear fuel. Their synthesis relies on the shaping of a lead-vanadate, lead sulfide and alginic acid mix as millimetric beads. These beads were calcined between 220°C and 500°C to remove organic alginic compounds template. However, according to the calcination temperature, lead sulfide could be partially oxidized, limiting iodine loading capacity. A compromise temperature between 290°C and 350°C was found to remove most of the alginic acid template and avoiding lead sulfide oxidation. These sorbents were tested for iodine trapping in static conditions at 60°C. They performed well with a sorption capacity up to 155 mg.g −1 by forming PbI 2 . Furthermore, these iodine-loaded sorbents could be easily converted into an iodine-containing lead-vanadate apatite matrix by spark plasma sintering. A dense sample was produced for a sintering temperature of 500°C under 70 MPa. Such a material could be suitable for radioactive iodine conditioning in deep geological disposal. Finally, lead-vanadate sorbents could provide an easy way to entrap and confine radioactive iodine from off-gas streams into a durable material within a few steps.

Domaines

Chimie

Dates et versions

hal-04163917 , version 1 (17-07-2023)

Identifiants

Citer

R. Pénélope, L. Campayo, M. Fournier, Sophie Le Gallet, A. Gossard, et al.. Lead-vanadate sorbents for iodine trapping and their conversion into an iodoapatite-based conditioning matrix. Frontiers in Chemistry, 2022, 10, ⟨10.3389/fchem.2022.1085868⟩. ⟨hal-04163917⟩
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