Preparation of SiO2 aerogel from rice husk ash

被引：40

作者：

Cui, Sheng ^{[1
,2
]}

Yu, Shu-wen ^{[1
]}

Lin, Ben-lan ^{[1
]}

Shen, Xiao-dong ^{[1
,2
]}

Gu, Danming ^{[1
]}

机构：

[1] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China

[2] Nanjing Tech Univ, Suqian Adv Mat Inst, Suqian 223800, Peoples R China

来源：

RSC ADVANCES | 2015年 / 5卷 / 81期

关键词：

LARGE-PORE VOLUME; SILICA AEROGEL; SURFACE-AREA; ADSORPTION; SPECTROSCOPY; SBA-15;

D O I：

10.1039/c5ra08886k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Silica was leached from rice husk ash as sodium silicate by NaOH treatment. Using water glass as the silica source, SiO2 aerogel was prepared via the sol-gel process and supercritical drying of ethanol. Based on gelation time and porous characteristics of SiO2 aerogel, the optimum gel preparation technology was determined such as silica concentration of 6.0 wt%, gelation at pH value of 5.0 and aging in H2O/EtOH. Incidentally, the density was as low as 0.0713 g cm(-3), specific surface area was 729.82 m(2) g(-1), hole size was 3.39 cm(3) g(-1), and average pore size was 16.32 nm, and the size distribution was uniform.

引用

页码：65818 / 65826

页数：9

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