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Evaluating the Physisorption and Chemisorption of Iodine on Bismuth-Functionalized Carbon Foams

Journal Article · · ACS Materials Letters
 [1];  [1];  [2];  [3];  [1]
  1. University of Nevada, Reno, NV (United States)
  2. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. University of Utah, Salt Lake City, UT (United States)
Bismuth-containing carbon materials have been shown to be highly promising sorbents for the capture of radioiodine. However, there is still a need to understand the effects of carbon and bismuth on the iodine sorption mechanism. In this study, we show the relationship between the physical and chemical sorption of iodine under different bismuth loading conditions. Here, highly porous and non-friable conductive carbon foams were prepared and bismuth was electrodeposited to provide strong iodine binding sites. For pure carbon foams, equal ratios of physisorbed and chemisorbed iodine-carbon phases were detected before desorption. As the concentration of bismuth increased, the chemisorption between bismuth and iodine dominated the total capture mechanism and physisorption was almost completely eliminated. Additionally, chemisorption of iodine depended upon the size and specific surface area of the bismuth particles present within the framework of the foam.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Environmental Management (EM); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
Grant/Contract Number:
89304021CEM000014; AC05-76RL01830; NE0008900
OSTI ID:
2438065
Report Number(s):
PNNL-SA--173737
Journal Information:
ACS Materials Letters, Journal Name: ACS Materials Letters Journal Issue: 9 Vol. 4; ISSN 2639-4979
Publisher:
ACS PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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