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Title: AGING AND IODINE LOADING OF SILVER-FUNCTIONALIZED AEROGELS

Abstract

Engineered silver-functionalized silica aerogels are being investigated for their application in off-gas treatment at a used nuclear fuel reprocessing facility. Reprocessing will release several key volatile radionuclides, including iodine-129. To achieve regulatory compliance, iodine-129 must be removed from any off-gas stream prior to environmental discharge. Silver-functionalized aerogels have been demonstrated to have high iodine capture capacity, high porosity and potential for conversion into a waste form. Capture materials used in off-gas treatment may be exposed to a heated, high humidity, acidic gas stream for months. Extended exposure to this stream could affect sorbent performance. It was the aim of this study to evaluate what impacts might be observed when Ag0-functionalized aerogels prepared at Pacific Northwest National Laboratory were contacted with a dry air stream for up to 6 months and then used to adsorb iodine from a synthetic off-gas stream. Results demonstrate that there is some loss of iodine capture capacity caused by aging, but that this loss is not as marked as for aging of more traditional iodine sorbents, such as silver-impregnated mordenite. Specifically, aging silver-functionalized aerogel under a dry air stream for up to 6 months can decrease its iodine capacity from 41wt% to 32wt%.

Authors:
 [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1096292
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Global 2013, Salt Lake City, UT, USA, 20130930, 20130930
Country of Publication:
United States
Language:
English

Citation Formats

Bruffey, Stephanie H, Jubin, Robert Thomas, Anderson, Kaara K, and Walker, Jr, Joseph Franklin. AGING AND IODINE LOADING OF SILVER-FUNCTIONALIZED AEROGELS. United States: N. p., 2013. Web.
Bruffey, Stephanie H, Jubin, Robert Thomas, Anderson, Kaara K, & Walker, Jr, Joseph Franklin. AGING AND IODINE LOADING OF SILVER-FUNCTIONALIZED AEROGELS. United States.
Bruffey, Stephanie H, Jubin, Robert Thomas, Anderson, Kaara K, and Walker, Jr, Joseph Franklin. Tue . "AGING AND IODINE LOADING OF SILVER-FUNCTIONALIZED AEROGELS". United States.
@article{osti_1096292,
title = {AGING AND IODINE LOADING OF SILVER-FUNCTIONALIZED AEROGELS},
author = {Bruffey, Stephanie H and Jubin, Robert Thomas and Anderson, Kaara K and Walker, Jr, Joseph Franklin},
abstractNote = {Engineered silver-functionalized silica aerogels are being investigated for their application in off-gas treatment at a used nuclear fuel reprocessing facility. Reprocessing will release several key volatile radionuclides, including iodine-129. To achieve regulatory compliance, iodine-129 must be removed from any off-gas stream prior to environmental discharge. Silver-functionalized aerogels have been demonstrated to have high iodine capture capacity, high porosity and potential for conversion into a waste form. Capture materials used in off-gas treatment may be exposed to a heated, high humidity, acidic gas stream for months. Extended exposure to this stream could affect sorbent performance. It was the aim of this study to evaluate what impacts might be observed when Ag0-functionalized aerogels prepared at Pacific Northwest National Laboratory were contacted with a dry air stream for up to 6 months and then used to adsorb iodine from a synthetic off-gas stream. Results demonstrate that there is some loss of iodine capture capacity caused by aging, but that this loss is not as marked as for aging of more traditional iodine sorbents, such as silver-impregnated mordenite. Specifically, aging silver-functionalized aerogel under a dry air stream for up to 6 months can decrease its iodine capacity from 41wt% to 32wt%.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {1}
}

Conference:
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