Grafted mesoporous silicas for radionuclide uptake: Radiolytic stability under electron irradiation

Impact of ionizing radiation on iodine capture by functionalized mesoporous silica

“…Obviously, it is higher than the yield measured in SBA-15 (0.08 ± 0.01 µmol.J -1 ), and also higher than the value measured in bulk water (0.045 ± 0.04 µmol.J -1 ) (Spinks,Woods, 1990). The H 2 radiolytic yield measured in the grafted sample is consistent, although higher, with measurements performed on other grafted SBA-15 samples (Zante et al, 2022). In this latter case, the major gas produced under irradiation was CO (and not H 2 ) due to the preferential radiolysis of the amide functional group.…”

“…Pristine SBA-15 has the highest specific surface (774 m².g -1 ). As expected, a decrease of the specific surface to 235 m².g -1 is observed after grafting of the organic compound (see Table 1) (Zante et al, 2022). This is assigned to the filling of the pores by grafting, as evidenced also by the decrease of the pore size (from 7.0 to 6.6 nm after grafting) and of the porous volume (from 1.17 to 0.49 cm 3 .g -1 after grafting).…”

“…As shown above (Figure 3), this is mainly due to the cleavage of N-H bonds (as compared to C-H ones). The exciton transfer at the silica/organic part interface is at the origin of the selective cleavage of bonds (Zante et al, 2022).…”

CO2 capture using silica-immobilized dicationic ionic liquids with magnetic and non-magnetic properties

“…And MDILs that were immobilized in the solid support. All of the samples exhibited a first stage of mass loss between 25 and 82 °C attributed to the moisture adsorbed by hygroscopic SBA-15 [ 57 ]. Pristine SBA-15 showed a more significant mass loss compared to the supports with immobilized DILs or MDILs.…”