Chalcogen-based aerogels as sorbents for radionuclide remediation

Brian J. Riley, Jaehun Chun, Wooyong Um, William C. Lepry, Josef Matyas, Matthew J. Olszta, Xiaohong Li, Kyriaki Polychronopoulou, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

The efficient capture of radionuclides with long half-lives such as technetium-99 (99Tc), uranium-238 (238U), and iodine-129 (129I) is pivotal to prevent their transport into groundwater and/or release into the atmosphere. While different sorbents have been considered for capturing each of them, in the current work, nanostructured chalcogen-based aerogels called chalcogels are shown to be very effective at capturing ionic forms of 99Tc and 238U, as well as nonradioactive gaseous iodine (i.e., a surrogate for 129I2), irrespective of the sorbent polarity. The chalcogel chemistries studied were Co0.7Bi 0.3MoS4, Co0.7Cr0.3MoS4, Co0.5Ni0.5MoS4, PtGe2S5, and Sn2S3. The PtGe2S5 sorbent performed the best overall with capture efficiencies of 98.0% and 99.4% for 99Tc and 238U, respectively, and >99.0% for I 2(g) over the duration of the experiment. The capture efficiencies for 99Tc and 238U varied between the different sorbents, ranging from 57.3-98.0% and 68.1-99.4%, respectively. All chalcogels showed >99.0% capture efficiency for iodine over the test duration. This versatile nature of chalcogels can provide an attractive option for the environmental remediation of the radionuclides associated with legacy wastes from nuclear weapons production as well as wastes generated during nuclear power production or nuclear fuel reprocessing.

Original languageEnglish
Pages (from-to)7540-7547
Number of pages8
JournalEnvironmental Science and Technology
Volume47
Issue number13
DOIs
Publication statusPublished - Jul 2 2013

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Chalcogens
Aerogels
iodine
Sorbents
Remediation
Radioisotopes
radionuclide
remediation
Iodine
technetium isotope
nuclear weapon
nuclear power
Nuclear weapons
Nuclear fuel reprocessing
half life
Uranium
uranium
Technetium
Nuclear energy
Groundwater

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Chalcogen-based aerogels as sorbents for radionuclide remediation. / Riley, Brian J.; Chun, Jaehun; Um, Wooyong; Lepry, William C.; Matyas, Josef; Olszta, Matthew J.; Li, Xiaohong; Polychronopoulou, Kyriaki; Kanatzidis, Mercouri G.

In: Environmental Science and Technology, Vol. 47, No. 13, 02.07.2013, p. 7540-7547.

Research output: Contribution to journalArticle

Riley, BJ, Chun, J, Um, W, Lepry, WC, Matyas, J, Olszta, MJ, Li, X, Polychronopoulou, K & Kanatzidis, MG 2013, 'Chalcogen-based aerogels as sorbents for radionuclide remediation', Environmental Science and Technology, vol. 47, no. 13, pp. 7540-7547. https://doi.org/10.1021/es400595z
Riley BJ, Chun J, Um W, Lepry WC, Matyas J, Olszta MJ et al. Chalcogen-based aerogels as sorbents for radionuclide remediation. Environmental Science and Technology. 2013 Jul 2;47(13):7540-7547. https://doi.org/10.1021/es400595z
Riley, Brian J. ; Chun, Jaehun ; Um, Wooyong ; Lepry, William C. ; Matyas, Josef ; Olszta, Matthew J. ; Li, Xiaohong ; Polychronopoulou, Kyriaki ; Kanatzidis, Mercouri G. / Chalcogen-based aerogels as sorbents for radionuclide remediation. In: Environmental Science and Technology. 2013 ; Vol. 47, No. 13. pp. 7540-7547.
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