Cooperative effect of polyethylene glycol and lignin on SiO2 microsphere production from rice husks.
Bioresour Technol
; 125: 172-4, 2012 Dec.
Article
em En
| MEDLINE
| ID: mdl-23026330
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)=21) 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 112 of ethanol, water, and extract, respectively and a silica to polyethylene glycol weight ratio of 21. 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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polietilenoglicóis
/
Oryza
/
Sementes
/
Dióxido de Silício
/
Lignina
/
Microesferas
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article