Gaseous Iodine Sorbents: A Comparison between Ag-Loaded Aerogel and Xerogel Scaffolds

材料科学 气凝胶 化学工程 重量分析 扫描电子显微镜 硅酸铝 超临界干燥 热重分析 纳米晶材料 粉末衍射 透射电子显微镜 核化学 催化作用 复合材料 纳米技术 有机化学 化学 冶金 结晶学 工程类
作者
Saehwa Chong,Brian J. Riley,Jacob A. Peterson,Matthew J. Olszta,Zayne J. Nelson
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:12 (23): 26127-26136 被引量:34
标识
DOI:10.1021/acsami.0c02396
摘要

Silver-exchanged aluminosilicate aerogels and xerogels were investigated as gaseous iodine [I2(g)] sorbents. The structures, morphologies, compositions, and porosities of aerogels (as-made and heat-treated at 350 °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 Ag0 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 ∼8 mass % higher iodine loading than Ag-impregnated xerogels and ∼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 m2 g-1 but decreased significantly to 34-120 m2 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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