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

doi:10.1016/j.jhazmat.2018.04.081

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

Full Record
Other Related Research

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.

Copy to clipboard


                    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.  doi:10.1016/j.jhazmat.2018.04.081.

Copy to clipboard


                    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.  doi:10.1016/j.jhazmat.2018.04.081.  https://www.osti.gov/servlets/purl/1437024.

Copy to clipboard


                    
@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},

  journal      = {Journal of Hazardous Materials},

  issn         = {0304-3894},

  number       = ,

  volume       = 379,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

DOI: 10.1016/j.jhazmat.2018.04.081

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 5 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Removal of TcO ₄ ^– from Representative Nuclear Waste Streams with Layered Potassium Metal Sulfide Materials

Journal Article Neeway, James J. ; Asmussen, R. Matthew ; Lawter, Amanda R. ; ... - Chemistry of Materials

Many efforts have focused on the sequestration and immobilization of ⁹⁹Tc because the radionuclide is highly mobile in oxidizing environments and presents serious health risks due to its radiotoxicity and long half-life (t _1/2= 213 000 a). We report that one of the more common methods for Tc removal from solution and immobilization in solids is based on reducing Tc from highly soluble Tc ^(VII) to sparingly soluble Tc ^(IV). Here, we report results obtained with two potassium metal sulfides (KMS-2 and KMS-2-SS) that are capable of reducing Tc ^(VII) to Tc ^(IV). Batch sorption experiments were performed in bothmore »« less
Cited by 30
DOI: 10.1021/acs.chemmater.6b01296

Full Text Available
Iodine immobilization by silver-impregnated granular activated carbon in cementitious systems

Journal Article Li, Dien ; Kaplan, Daniel I. ; Price, Kimberly A. ; ... - Journal of Environmental Radioactivity

Silver (Ag)-based technologies are amongst the most common approaches to removing radioiodine from aqueous waste streams. As a result, a large worldwide inventory of radioactive AgI waste presently exits, which must be stabilized for final disposition. In this work, the efficacy of silver-impregnated granular activated carbon (Ag-GAC) to remove iodide (I ^-), iodate (IO ₃ ^-) and organo-iodine (org-I) from cementitious leachate was examined. In addition, cementitious materials containing I-, IO ₃ ^-, or org-I loaded Ag-GAC were characterized by iodine K-edge XANES and EXAFS to provide insight into iodine stability and speciation in these waste forms. The Ag-GAC wasmore »« less
DOI: 10.1016/j.jenvrad.2019.106017

Full Text Available
Collaborative Research: Natural Organic Matter and Microbial Controls on Mobilization/Immobilization of I and Pu in Soils and Waters Affected by Radionuclide Releases in USA and Japan

Technical Report Santschi, Peter H. ; Xu, Chen ; Lin, Peng ; ...

In this project, the relationship between natural organic matter (NOM) and two radioactive elements that are relevant to nuclear waste disposal were studied: Plutonium (Pu) and Iodine. The human and environmental risks associated with Pu stem mainly from the very long half-lives of several of its isotopes ( ²³⁸Pu, 88 yr; ²³⁹Pu, 24,100 yr; ²⁴⁰Pu, 6560 yr) and its radiotoxicity. Understanding Pu biogeochemical behavior in both near-field (>10-11M) and far-field scales (<10-11M) is imperative to the development of approaches for reprocessing Pu, remediation of Pu contamination and accurate assessment of risks posed by disposal practices for Pu-bearing wastes. The environmentalmore »« less
DOI: 10.2172/1579739

Full Text Available
Laboratory report on iodine ( ¹²⁹I and ¹²⁷I) speciation, transformation and mobility in Handford groundwater, suspended particles and sediments

Technical Report Santschi, P. H. ; Xu, C. ; Zhang, S. ; ...

The Hanford Site in eastern Washington produced plutonium for several decades and in the process generated billions of gallons of radioactive waste. Included in this complex mixture of waste was 50 Ci of iodine-129 ( ¹²⁹I). Iodine-129’s high abundance, due to its high fission yield, and extreme toxicity result in iodine-129 becoming a key risk driver at many Department of Energy (DOE) sites. The mobility of radioiodine in arid environments, such as the Hanford Site, depends largely on its chemical speciation and is also greatly affected by many other environmental factors, especially natural sediment organic matter (SOM). Groundwater radioiodine speciationmore »« less
DOI: 10.2172/1114211

Full Text Available
Removal of TcO ₄ ^– from Representative Nuclear Waste Streams with Layered Potassium Metal Sulfide Materials

Journal Article Neeway, James J. ; Asmussen, R. Matthew ; Lawter, Amanda R. ; ... - Chemistry of Materials

Many efforts have focused on the sequestration and immobilization of 99Tc because the radionuclide is highly mobile in oxidizing environments and presents serious health risks due to its radiotoxicity and long half-life (t1/2 = 213 000 a). One of the more common methods for Tc removal from solution and immobilization in solids is based on reducing Tc from highly soluble Tc(VII) to sparingly soluble Tc(IV). In order to remove solution Tc through this reduction process, the Tc-sequestering solid must contain a reducing agent and, ideally, the Tc-sequestering material would function in a large range of chemical environments. For long-term stability,more »« less
DOI: 10.1021/acs.chemmater.6b01296

Similar Records