硅酸钠
气凝胶
去壳
材料科学
蒸馏水
硅胶
氢氧化钠
多孔性
化学工程
介孔材料
比表面积
大气压力
打赌理论
水溶胶
核化学
化学
色谱法
吸附
复合材料
有机化学
催化作用
工程类
地质学
海洋学
生物
植物
作者
Azadeh Tadjarodi,Marzieh Haghverdi,V. Mohammadi
标识
DOI:10.1016/j.materresbull.2012.04.143
摘要
Silica aerogel, a mesoporous material, was prepared from rice husk ash by sol–gel method and dried under atmospheric pressure. In this method, rice husk ash, which is rich in silica, was extracted with sodium hydroxide solution to produce a sodium silicate solution. This solution was neutralized with acid to form a silica hydrosol, and a small amount of tetraethyl silicate (TEOS) to form a gel. The aged gel was washed carefully by distilled water and ethanol and finally dried under atmospheric air. The prepared silica aerogels were characterized by XRF, FT-IR, TG, DTA, DTG, XRD, BET and SEM measurements. The synthesized TEOS-doped silica aerogel was a light solid with specific surface area of 315 m2/g, pore volume 0.78 cm3/g, average pore size 9.8 nm, bulk density 0.32 g/cm3 and porosity 85%.
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