TY - JOUR
T1 - Silver Sulfide and Silver Sulfate as Aging Byproducts and Adsorbents for Gaseous Iodine Capture in Spent Nuclear Fuel Reprocessing
AU - Shen, Ziheng
AU - Wiechert, Alexander I.
AU - Choi, Seungrag
AU - Tavlarides, Lawrence L.
AU - Tsouris, Costas
AU - Yiacoumi, Sotira
N1 - Funding Information:
This research was supported by the Nuclear Energy University Program, Office of Nuclear Energy, U.S. Department of Energy (grant number 18-15596). The authors are thankful to Dr. Greaney Allison (Oak Ridge National Laboratory) for providing the I-loaded AgZ samples used for elemental analysis in this study. This work was performed in part at the Materials Characterization Facility (MCF) at Georgia Tech. The MCF is jointly supported by the GT Institute for Materials (IMat) and the Institute for Electronics and Nanotechnology (IEN), which is a member of the National Nanotechnology Coordinated Infrastructure supported by the National Science Foundation (Grant ECCS-2025462). 2 0
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/9/28
Y1 - 2022/9/28
N2 - While it is considered a promising adsorbent for radioiodine capture in spent nuclear fuel reprocessing off-gas, silver functionalized silica aerogel (Ag0-aerogel) experiences a capacity loss when exposed to other off-gas components (O2, H2O, NO, and NO2) through a process known as aging. Ag2S and Ag2SO4were identified as major byproducts of aging, but their impact on iodine adsorption remains unclear. Thus, to further investigate aging, we loaded Ag2S and Ag2SO4powders with molecular iodine (I2) at 150 °C and characterized their properties. The I2adsorption capacity of Ag2SO4was 0.12 wt % after 72 h, suggesting its formation directly reduces the capacity of the Ag0-aerogel. Conversely, Ag2S had an iodine capacity of 86.8 wt % and near total Ag utilization after 240 h. Given its high capacity and availability, we evaluated the feasibility of Ag2S as an I2adsorbent in future applications. Several drawbacks need to be overcome, including the relatively slow uptake rate, potential emission of another hazardous byproduct (SO2), and potential aging effects (e.g., Ag2S conversion to Ag2SO4) before Ag2S can be applied for the radioiodine capture process.
AB - While it is considered a promising adsorbent for radioiodine capture in spent nuclear fuel reprocessing off-gas, silver functionalized silica aerogel (Ag0-aerogel) experiences a capacity loss when exposed to other off-gas components (O2, H2O, NO, and NO2) through a process known as aging. Ag2S and Ag2SO4were identified as major byproducts of aging, but their impact on iodine adsorption remains unclear. Thus, to further investigate aging, we loaded Ag2S and Ag2SO4powders with molecular iodine (I2) at 150 °C and characterized their properties. The I2adsorption capacity of Ag2SO4was 0.12 wt % after 72 h, suggesting its formation directly reduces the capacity of the Ag0-aerogel. Conversely, Ag2S had an iodine capacity of 86.8 wt % and near total Ag utilization after 240 h. Given its high capacity and availability, we evaluated the feasibility of Ag2S as an I2adsorbent in future applications. Several drawbacks need to be overcome, including the relatively slow uptake rate, potential emission of another hazardous byproduct (SO2), and potential aging effects (e.g., Ag2S conversion to Ag2SO4) before Ag2S can be applied for the radioiodine capture process.
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U2 - 10.1021/acs.iecr.2c02024
DO - 10.1021/acs.iecr.2c02024
M3 - Article
AN - SCOPUS:85138810518
SN - 0888-5885
VL - 61
SP - 14393
EP - 14401
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 38
ER -