Bismuth-embedded SBA-15 mesoporous silica for radioactive iodine capture and stable storage

Porous sorbents for the capture of radioactive iodine compounds: a review

“…In a study by Yang et al , 86 the remarkable efficiency for iodine capture of bismuth-doped mesoporous silica (SBA-15) was proved. Bismuth was incorporated into the SBA-15 material by previously modifying the silica surface with thiol groups and subsequent thermal treatment that led to the formation of a BI 2 S 3 phase.…”

High iodine adsorption by polyethyleneimine impregnated nanosilica sorbents

“…The grafting of aminosilane reagents on the silanol groups of SBA-15 yielded to a strong enhancement of the I2 adsorption capacity (up to 600 mg/g at 25°C) in comparison with the parent (non-functionalized) silica (< 50 mg/g) [20]. In that respect, the good performances of this amino-functionalized SBA-15 could be somewhat compared to those of MOF's bearing NH2-functionalized ligands or triethylenediamine (TEDA)-impregnated charcoals [21]. As reported already long time ago for homogeneous systems, they have probably for origin the formation of charge-transfer complexes between amine groups (the donor) and molecular iodine (the acceptor) [22].…”

Investigating the Durability of Iodine Waste Forms in Dilute Conditions

“…A portion of this iodine is 129 I with a half-life of 15.7 million years; to prevent discharge of this long-lived radionuclide, the released iodine needs to be captured in the off-gas management system of the reprocessing facility. Multiple approaches to removing the iodine from the off-gas system (which contains large amounts of water and NO X ) and can be grouped into: (A) wet scrubbing methods such as Mercurex, Iodox, electrolytic scrubbing, and alkaline scrubbing [ 2 , 3 ]; and (B) solid sorbent capture including resins [ 4 ], carbon-based materials [ 5 , 6 , 7 ], metal organic frameworks [ 8 , 9 ], zeolites [ 10 , 11 , 12 ], silica [ 13 ] and aerogels [ 14 , 15 , 16 ]. The wet scrubbing processes would all require a secondary process(es) for the iodine-loaded product to be converted to a waste form such as grouting or vitrification.…”