Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments

Asmussen, R. Matthew; Matyáš, Josef; Qafoku, Nikolla P.; Kruger, Albert A.

doi:10.1016/j.jhazmat.2018.04.081

Title: Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments

Journal Article · Tue May 01 00:00:00 EDT 2018 · Journal of Hazardous Materials

DOI:https://doi.org/10.1016/j.jhazmat.2018.04.081· OSTI ID:1842969

^[1]; Matyáš, Josef ^[1];

^[1]; Kruger, Albert A. ^[2]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
U.S. Dept. of Energy, Richland, WA (United States)

Here, one of the key challenges for radioactive waste management is the efficient capture and immobilization of radioiodine, because of its radiotoxicity, high mobility in the environment, and long half-life (t_1/2 = 1.57 × 10⁷ years). Silver-functionalized silica aerogel (AgAero) represents a strong candidate for safe sequestration of radioiodine from various nuclear waste streams and subsurface environments. Batch sorption experiments up to 10 days long were carried out in oxic and anoxic conditions in both deionized water (DIW) and various Hanford Site Waste Treatment Plant (WTP) off-gas condensate simulants containing from 5 to 10 ppm of iodide (I^–) or iodate (IO₃^–). Also tested was the selectivity of AgAero towards I^– in the presence of other halide anions. AgAero exhibited fast and complete removal of I^– from DIW, slower but complete removal of I^– from WTP off-gas simulants, preferred removal of I^– over Br^– and Cl^–, and it demonstrated ability to remove IO₃^– through reduction to I^–.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1842969

Alternate ID(s):: OSTI ID: 1437024; OSTI ID: 1842970

Report Number(s):: PNNL-SA-129580; TRN: US2302240

Journal Information:: Journal of Hazardous Materials, Vol. 379; ISSN 0304-3894

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Title: Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments

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