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Title: Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents

Abstract

This paper discusses the development of aluminosilicates aerogels as scaffolds for Ag0 nanoparticles used for chemisorption of I2(g). The starting materials for these scaffolds included both Na-Al-Si-O and Al-Si-O aerogels, both synthesized from metal alkoxides. The Ag0 particles are added by soaking the aerogels in AgNO3 followed by drying and flowing under H2/Ar to reduce Ag+ → Ag0. In some cases, samples were soaked in 3-(mercaptopropyl)trimethoxysilane under supercritical CO2 to add –SH tethers to the aerogel surfaces for more effective binding of Ag+. During the Ag+-impregnation steps, for the Na-Al-Si-O aerogels, Na was replaced with Ag, and for the Al-Si-O aerogel, Si was replaced with Ag. The Ag-loading of thiolated versus non-thiolated Na-Al-Si-O aerogels was comparable at ~35 at% whereas the Ag-loading in unthiolated Al-Si-O aerogels was significantly lower at ~ 7 at% after identical treatment. Iodine loadings in both thiolated and unthiolated Ag0-functionalized Na-Al-Si-O aerogels were > 0.5 g g-1 showing almost complete utilization of the Ag through chemisorption to form AgI. Iodine loading in the thiolated Al-Si-O aerogel was 0.31 g g-1. The control of Ag uptake over solution residence time and [AgNO3] demonstrates the ability to customize the Ag-loading in the base sorbent to regulate the capacitymore » of iodine chemisorption. Consolidation experimental results are also presented.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Laboratory, Richland, Washington 99354, United States
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1398211
Report Number(s):
PNNL-SA-126525
Journal ID: ISSN 1944-8244; 830403000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Applied Materials and Interfaces; Journal Volume: 9; Journal Issue: 38
Country of Publication:
United States
Language:
English
Subject:
aerogel; aluminosilicate aerogel; iodine capture; Iodine Capture: Iodine immobilization

Citation Formats

Riley, Brian J., Kroll, Jared O., Peterson, Jacob A., Matyáš, Josef, Olszta, Matthew J., Li, Xiaohong, and Vienna, John D.. Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents. United States: N. p., 2017. Web. doi:10.1021/acsami.7b10290.
Riley, Brian J., Kroll, Jared O., Peterson, Jacob A., Matyáš, Josef, Olszta, Matthew J., Li, Xiaohong, & Vienna, John D.. Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents. United States. doi:10.1021/acsami.7b10290.
Riley, Brian J., Kroll, Jared O., Peterson, Jacob A., Matyáš, Josef, Olszta, Matthew J., Li, Xiaohong, and Vienna, John D.. Thu . "Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents". United States. doi:10.1021/acsami.7b10290.
@article{osti_1398211,
title = {Silver-Loaded Aluminosilicate Aerogels As Iodine Sorbents},
author = {Riley, Brian J. and Kroll, Jared O. and Peterson, Jacob A. and Matyáš, Josef and Olszta, Matthew J. and Li, Xiaohong and Vienna, John D.},
abstractNote = {This paper discusses the development of aluminosilicates aerogels as scaffolds for Ag0 nanoparticles used for chemisorption of I2(g). The starting materials for these scaffolds included both Na-Al-Si-O and Al-Si-O aerogels, both synthesized from metal alkoxides. The Ag0 particles are added by soaking the aerogels in AgNO3 followed by drying and flowing under H2/Ar to reduce Ag+ → Ag0. In some cases, samples were soaked in 3-(mercaptopropyl)trimethoxysilane under supercritical CO2 to add –SH tethers to the aerogel surfaces for more effective binding of Ag+. During the Ag+-impregnation steps, for the Na-Al-Si-O aerogels, Na was replaced with Ag, and for the Al-Si-O aerogel, Si was replaced with Ag. The Ag-loading of thiolated versus non-thiolated Na-Al-Si-O aerogels was comparable at ~35 at% whereas the Ag-loading in unthiolated Al-Si-O aerogels was significantly lower at ~ 7 at% after identical treatment. Iodine loadings in both thiolated and unthiolated Ag0-functionalized Na-Al-Si-O aerogels were > 0.5 g g-1 showing almost complete utilization of the Ag through chemisorption to form AgI. Iodine loading in the thiolated Al-Si-O aerogel was 0.31 g g-1. The control of Ag uptake over solution residence time and [AgNO3] demonstrates the ability to customize the Ag-loading in the base sorbent to regulate the capacity of iodine chemisorption. Consolidation experimental results are also presented.},
doi = {10.1021/acsami.7b10290},
journal = {ACS Applied Materials and Interfaces},
number = 38,
volume = 9,
place = {United States},
year = {Thu Sep 14 00:00:00 EDT 2017},
month = {Thu Sep 14 00:00:00 EDT 2017}
}