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KI and TEDA influences towards the retention of radiotoxic CH3I by activated carbons.

Authors
  • Lin, H1
  • Chebbi, M2
  • Monsanglant-Louvet, C1
  • Marcillaud, B1
  • Roynette, A1
  • Doizi, D3
  • Parent, P4
  • Laffon, C4
  • Grauby, O4
  • Ferry, D4
  • 1 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, Saclay 91192, Gif-sur-Yvette, France. , (France)
  • 2 Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, Saclay 91192, Gif-sur-Yvette, France. Electronic address: [email protected] , (France)
  • 3 Commissariat à l'Énergie Atomique (CEA), DEN/DES/ISAS/DPC/SECR/LRMO, Gif-sur-Yvette 91191, France. , (France)
  • 4 Aix Marseille University, CNRS, CINaM, Marseille, France. , (France)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Feb 23, 2022
Volume
431
Pages
128548–128548
Identifiers
DOI: 10.1016/j.jhazmat.2022.128548
PMID: 35228073
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Activated carbons (AC) are widely used within the ventilation networks of nuclear facilities to trap volatile iodine species. In this paper, the performances of various commercial activated carbons towards the trapping of γ-labelled methyl iodide were evaluated in semi-pilot scale under different R.H. according to normalized procedures. A combination between the retention performances and the physico-chemical properties as deduced from several techniques was performed to gain insights about the AC influencing parameters on γ-CH3I capture. Different trends were obtained depending on the impregnant nature and the studied conditions. A high sensitivity of KI/AC towards water vapor was outlined. At R.H. = 40%. The enhancement of water uptake by KI/AC as deduced from water adsorption experiments, leads to decrease the available microporosity for CH3I physisorption, inducing therefore the reduction of performances as a function of KI content at these conditions. At R.H. = 90%, the adsorption mechanism was found to be governed by isotopic exchange reaction since 90% of the microporosity was occupied by water molecules. Therefore, a slight increase of DF was obtained in these conditions. This sensitivity was found to be of a lesser extent for TEDA/AC displaying the highest retention performances whatever the studied condition. Copyright © 2022 Elsevier B.V. All rights reserved.

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