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Synthesis and characterization of Ag-containing hydrophobic aluminosilicate aerogels for I2 capture
Journal of Nuclear Materials ( IF 2.8 ) Pub Date : 2021-09-22 , DOI: 10.1016/j.jnucmat.2021.153309
Jae Won Lee 1 , Seok Min Hong 1 , Ju Ho Lee 1 , Yung Zun Cho 1
Affiliation  

Ag-containing1 hydrophobic aluminosilicate aerogels capable of capturing I2 were prepared by sol-gelation from Na, Al, and Si alkoxides using co-solvent exchange, Ag/Na ion exchange, solvent exchange, silylation-induced surface hydrophobization, and ambient-pressure drying. The Ag contents, Brunauer-Emmett-Teller (BET) surface areas, and pore size distributions of aerogels depended on the solvent of the co-solvent exchange step, with isopropanol affording higher Ag contents and lower BET surface areas than water. This behavior was ascribed to the reaction of isopropanol-insoluble NaOH in gel pores during Ag/Na exchange with aqueous AgNO3 to form water-insoluble Ag2O. The Ag-containing hydrophobic aluminosilicate aerogel modified with hexamethyldisilazane contained meso- and macropores and exhibited a maximum iodine capture capacity of 0.555 g-I/g-sorbent, a BET surface area of 172 m2/g, a specific pore volume of 1.29 cm3/g, and an average pore size of 23.4 nm.



中文翻译:

用于 I2 捕获的含银疏水性铝硅酸盐气凝胶的合成与表征

使用共溶剂交换、Ag/Na 离子交换、溶剂交换、硅烷化诱导的表面疏水化和环境-通过溶胶凝胶化从 Na、Al 和 Si 醇盐制备能够捕获 I 2的含银1疏水性铝硅酸盐气凝胶。压力干燥。气凝胶的 Ag 含量、Brunauer-Emmett-Teller (BET) 表面积和孔径分布取决于共溶剂交换步骤的溶剂,异丙醇提供比水更高的 Ag 含量和更低的 BET 表面积。这种行为归因于在 Ag/Na 与水性 AgNO 3交换过程中,不溶于异丙醇的 NaOH 在凝胶孔中反应形成不溶于水的 Ag 2O. 六甲基二硅氮烷改性的含银疏水性铝硅酸盐气凝胶含有中孔和大孔,最大碘捕获能力为 0.555 gI/g-吸附剂,BET 表面积为 172 m 2 /g,比孔体积为 1.29 cm 3 /g,平均孔径为23.4 nm。

更新日期:2021-09-28
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