Isotopic exchange inside impregnated activated carbons

Hantao Lin (1) , Mouheb Chebbi (1) , Celine Monsanglant Louvet (1) , Benoit Marcillaud (1) , Audrey Roynette (1) , Denis Doizi (2) , Philippe Parent (3)

1 IRSN/PSN-RES/SCA/LECEV - Laboratoire d'expérimentations sur le comportement des équipements et la ventilation
2 LRMO - Laboratoire de Radiolyse et de la Matière Organique
3 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

Activated carbons (AC) have been used for the removal of iodine within ventilation networks of nuclear facilities. More particularly, the commonly used nuclear grade AC are co-impregnated with potassium iodide (KI, 1 wt%) and triethylenediamine (TEDA, < 5 wt%) [1]. The present study aims to gain insights on the importance of isotopic exchange reaction resulting from KI as a comparison with other mechanisms (physisorption and chemisorption). The presence of isotopic exchange in some configurations has been qualitatively proven. However, the quantification of this reaction must be evaluated by comparing the breakthrough curves in active and inactive. Hence, a specific test bench allowing the determination of breakthrough curve in active is under validation.

Domaines: Chimie

Hantao Lin, Mouheb Chebbi, Celine Monsanglant Louvet, Benoit Marcillaud, Audrey Roynette, et al.. Isotopic exchange inside impregnated activated carbons. Carbon Chemistry and Materials (Virtual), Nov 2021, Rome, Italy. ⟨irsn-04098795⟩