期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 23, 页码 26127-26136出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02396
关键词
aerogel; xerogel; scaffolds; iodine; iodine capture; Ag-loaded sorbents
资金
- DOE [DE-AC05-76RL01830]
Silver-exchanged aluminosilicate aerogels and xerogels were investigated as gaseous iodine [I-2(g)] sorbents. The structures, morphologies, compositions, and porosities of aerogels (as-made and heat-treated at 350 degrees C) and xerogels are compared by using powder X-ray diffraction (PXRD), scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, and specific surface area (SSA) as well as pore size analyses. The as-made aerogels, xerogels, and heat-treated aerogels were ion exchanged with Ag in AgNO3 solutions of deionized water and methanol (5:1 by volume), and PXRD patterns showed the presence of nanocrystalline Ag-0 after the Ag exchange. Gravimetric iodine loadings of Ag-aerogels and Ag-xerogels were 0.33-0.41 g g(-1). The Ag-aerogels without heat treatment showed an similar to 8 mass % higher iodine loading than Ag-impregnated xerogels and similar to 3 mass % higher than heat-treated Ag-impregnated aerogels. All gels after iodine uptake showed the presence of AgI, indicating chemisorption of iodine to silver. The SSA values of the as-made gels were 420-600 m(2) g(-1) but decreased significantly to 34-120 m(2) g(-1) after Ag impregnation and iodine uptake. Overall, changes in physical and chemical properties of aerogels and xerogels after iodine uptake were similar and the differences in iodine loading capacities of the aerogels and xerogels were minimal, providing a driver for using xerogels due to their less complex synthesis process as compared to aerogels.
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