Abstract：
:A simple method to the preparation of SiO(2) microspheres from rice husks (RH) was developed. The rice husks were extracted with 2M NaOH solution to obtain a extract contained silica and lignin, and silica spheres were obtained after addition of distilled water, ethanol, 1M H(2)SO(4) and PEG (W(silica):W(PEG)=2:1) to the extract in a controllable sol-gel process and calcination at 550°C. The optimum synthesis conditions were, adjustment of the extract to pH 3, a volume ratio of 1:1:2 of ethanol, water, and extract, respectively and a silica to polyethylene glycol weight ratio of 2:1. The SiO(2) microspheres produced under these conditions exhibited a relatively uniform particle size distribution around 500 nm as determined by LPSA, which indicated a cooperative function of added PEG and extracted lignin towards the formation of SiO(2) microspheres.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Lin L,Zhai SR,Xiao ZY,Liu N,Song Y,Zhai B,An QDdoi
10.1016/j.biortech.2012.08.119subject
Has Abstractpub_date
2012-12-01 00:00:00pages
172-4eissn
0960-8524issn
1873-2976pii
S0960-8524(12)01314-4journal_volume
125pub_type
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