title: Cooperative effect of polyethylene glycol and lignin on SiO2 microsphere production from rice husks.
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.
authors.affiliation: Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
authors.forename: Long
authors.initials: L
authors.lastname: Lin
authors.forename: Shang-Ru
authors.initials: SR
authors.lastname: Zhai
authors.forename: Zuo-Yi
authors.initials: ZY
authors.lastname: Xiao
authors.forename: Na
authors.initials: N
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Bin
authors.initials: B
authors.lastname: Zhai
authors.forename: Qing-Da
authors.initials: QD
authors.lastname: An
mesh_terms: D008031:Lignin / Q000737:chemistry*; D008863:Microspheres; D012275:Oryza / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000138:chemical synthesis*
chemical_list: D011092:Polyethylene Glycols; D012822:Silicon Dioxide; D008031:Lignin