Cooperative effect of polyethylene glycol and lignin on SiO2 microsphere production from rice husks.
Cooperative effect of polyethylene glycol and lignin on SiO2 microsphere production from rice husks.
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DOI：
10.1016/j.biortech.2012.08.119
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发表时间：
2012-12
影响因子：
11.4
通讯作者：
Long Lin;S. Zhai;Zuoyi Xiao;Na Liu;Yu Song;B. Zhai;Qing-da An
中科院分区：
文献类型：
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作者：
Long Lin;S. Zhai;Zuoyi Xiao;Na Liu;Yu Song;B. Zhai;Qing-da An
以稻壳为原料，采用一种简单的方法制备SiO2微球。以稻壳为原料，用2 M NaOH溶液提取，得到含有二氧化硅和木质素的提取物，在提取物中加入蒸馏水、乙醇、1 M H2SO 4和PEG（Wsilica：WPEG=2：1），通过可控的溶胶-凝胶过程，在550°C下煅烧，得到二氧化硅球。最佳合成条件是，调整提取物的pH值为3，乙醇，水和提取物的体积比为1：1：2，分别和二氧化硅聚乙二醇的重量比为2：1。在此条件下制得的SiO2微球粒径分布均匀，LPSA法测得粒径分布在500 nm左右，表明加入的PEG和提取的木质素对SiO2微球的形成有协同作用。
A simple method to the preparation of SiO2microspheres 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 H2SO4and PEG (Wsilica:WPEG=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 SiO2microspheres produced under these conditions exhibited a relatively uniform particle size distribution around 500nm as determined by LPSA, which indicated a cooperative function of added PEG and extracted lignin towards the formation of SiO2microspheres.