Short-period synthesis of high specific surface area silica from rice husk char
Short-period synthesis of high specific surface area silica from rice husk char
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DOI：
10.1016/j.matlet.2011.03.011
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发表时间：
2011-06-15
影响因子：
3
通讯作者：
Zhu, Xifeng
中科院分区：
文献类型：
--
作者：
Li, Dawei;Zhu, Xifeng
以稻壳炭为原料，避免常用的水热处理步骤，以聚乙二醇（PEG，分子量=20,000）为模板，在短时间内制备出高比表面积的多孔二氧化硅。其制备工艺主要包括硅酸钠生产、正磷酸沉淀、煅烧。 PEG 的用量显着影响二氧化硅的结构特性，如比表面积、总孔体积和介孔体积。原因应归因于通过煅烧从 PEG-二氧化硅复合材料中去除的 PEG 量。通过改变PEG剂量从100到176mg，可以在10小时内成功制备比表面积从709到936m(2)/g的多孔二氧化硅。 (C) 2011 Elsevier B.V. 保留所有权利。
Porous silica with high specific surface areas is prepared from rice husk char within a short period by avoiding the commonly used hydrothermal treatment step and using polyethylene glycol (PEG, molecular weight = 20,000) as a template. The preparation process mainly involves sodium silicate production, precipitation with ortho-phosphoric acid, and calcination. The amount of used PEG significantly affects the silica textural properties like the specific surface area, total pore volume and mesopore volume. The reason should be attributed to the amount of PEG removed from the PEG-silica composites by calcination. By varying the PEG dosage from 100 to 176 mg, porous silica with specific surface areas ranging from 709 to 936 m(2)/g could be successfully prepared within 10 h. (C) 2011 Elsevier B.V. All rights reserved.