Superior Iodine Uptake Capacity Enabled by an Open Metal-Sulfide Framework Composed of Three Types of Active Sites

Silver Sulfide and Silver Sulfate as Aging Byproducts and Adsorbents for Gaseous Iodine Capture in Spent Nuclear Fuel Reprocessing

“…As demonstrated in Figure g, two distinct peaks at 82 and 104 cm –1 matched well with the reported values for β-AgI . Absence of the peak at 183 cm –1 indicates no molecular iodine (I 2 ) exists on the sample surface, which further supports that all iodine was chemisorbed . Another weak peak at ∼225 cm –1 was, nevertheless, present only at some regions of the sample (i.e., it is present in the Raman spectrum for region 1 but absent in the same spectra for region 2).…”

“…Another weak peak at ∼225 cm –1 was, nevertheless, present only at some regions of the sample (i.e., it is present in the Raman spectrum for region 1 but absent in the same spectra for region 2). This peak can be assigned to the S–S bending modes, which implies that elemental sulfur or polysulfide species might be reaction byproducts during adsorption . We must acknowledge, however, that this is a very weak band, and the precise assignment for S species needs to be more carefully evaluated (e.g., through in situ characterization).…”

“…30 Absence of the peak at 183 cm −1 indicates no molecular iodine (I 2 ) exists on the sample surface, which further supports that all iodine was chemisorbed. 31 Another weak peak at ∼225 cm −1 was, nevertheless, present only at some regions of the sample (i.e., it is present in the Raman spectrum for region 1 but absent in the same spectra for region 2). This peak can be assigned to the S−S bending modes, which implies that elemental sulfur or polysulfide species might be reaction byproducts during adsorption.…”

“…This peak can be assigned to the S−S bending modes, which implies that elemental sulfur or polysulfide species might be reaction byproducts during adsorption. 31 We must acknowledge, however, that this is a very weak band, and the precise assignment for S species needs to be more carefully evaluated (e.g., through in situ characterization). The presence of residual S is to be expected since the mass of the sample was still increasing, albeit very slowly (less than 1.5 wt % in 24 h), at the end of the adsorption experiment.…”

Multi-Functionalization Integration into the Electrospun Nanofibers Exhibiting Effective Iodine Capture from Water

“…Currently, nuclear energy is making tremendous contributions to the sustainable development of modern society but simultaneously producing massive radioactive wastes, which emerge as an enormous challenge toward the environment and public health. , Radioactive iodine isotopes (e.g., 131 I or 129 I) generated by uranium fission are one of the most hazardous pollutants in nuclear disposal and accidents owing to the extremely large half-life (1.6 × 10 7 years) of 129 I, high volatility and biotoxicity, strong radiation, easy aggregation in glands, and so on. , If not appropriately solved, the release of radioiodine will seriously cause adverse effects on air and water. Accordingly, the demand for efficiently reprocessing of iodine isotopes from nuclear fuel becomes more and more urgent .…”