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

doi:https://doi.org/10.1016/j.jhazmat.2018.04.081

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

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Abstract

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 × 10 ⁷ 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 (IO ₃ ^–). 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 IO ₃ ^– through reduction to I ^–.

Authors:

Asmussen, R. Matthew ^[1]; Matyas, Josef ^[1]; Qafoku, Nikolla P. ^[1]; Kruger, Albert A. ^[2]

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

Publication Date:: 2018-05-01

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1437024

Report Number(s):: PNNL-SA-129580
Journal ID: ISSN 0304-3894; PII: S0304389418303364; TRN: US1900267

Grant/Contract Number:: AC05-76RL01830

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Journal of Hazardous Materials

Additional Journal Information:: Journal Volume: 379; Journal ID: ISSN 0304-3894

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; Nuclear waste management; Iodine; Capture; Aqueous environments; Silver-functionalized silica aerogel

Citation Formats


                    Asmussen, R. Matthew, Matyas, Josef, Qafoku, Nikolla P., and Kruger, Albert A. Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.jhazmat.2018.04.081.

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                    Asmussen, R. Matthew, Matyas, Josef, Qafoku, Nikolla P., & Kruger, Albert A. Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments.  United States.  https://doi.org/10.1016/j.jhazmat.2018.04.081

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                    Asmussen, R. Matthew, Matyas, Josef, Qafoku, Nikolla P., and Kruger, Albert A. Tue .  
        "Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments".  United States.  https://doi.org/10.1016/j.jhazmat.2018.04.081.  https://www.osti.gov/servlets/purl/1437024.

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@article{osti_1437024,

  title        = {Silver-functionalized silica aerogels and their application in the removal of iodine from aqueous environments},

  author       = {Asmussen, R. Matthew and Matyas, Josef and Qafoku, Nikolla P. and Kruger, Albert A.},

  abstractNote = {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 (t1/2 = 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–.},

  doi          = {10.1016/j.jhazmat.2018.04.081},

  url          = {https://www.osti.gov/biblio/1437024},
  journal      = {Journal of Hazardous Materials},

  issn         = {0304-3894},

  number       = ,

  volume       = 379,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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