A green route to preparation of silica powders with rice husk ash and waste gas

被引：190

作者：

An, Dongmin ^{[1
]}

Guo, Yupeng ^{[1
]}

Zhu, Yanchao ^{[1
]}

Wang, Zichen ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, Changchun 130012, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2010年 / 162卷 / 02期

关键词：

Rice husk ash; Na2CO3; Carbonation route; Silica powders; SUPERCRITICAL CO2; AQUEOUS-SOLUTION; HULL ASH; NANOPOROUS MATERIALS; ZSM-5; ZEOLITE; METAL-IONS; ADSORPTION; PERFORMANCE; REMOVAL; CADMIUM(II);

D O I：

10.1016/j.cej.2010.05.052

中图分类号：

X [环境科学、安全科学];

学科分类号：

083001 [环境科学];

摘要：

The objective of the present work is to develop a green procedure for preparation of silica powders from rice husk ash (RHA) via a carbonation route. The raw materials, RHA and waste gas, were obtained from the power plant. Na2CO3 was used as the silica extraction reagent and waste gas was the precipitator. The silicon dioxide extraction yield reached 72.52% and was affected by impregnation ratio, concentration of Na2CO3 solution and reaction time. The microstructures of the as-obtained silica powders were characterized by X-ray diffraction (XRD) and infrared spectra (IR). The mineral contents of RHA and product were investigated by inductively coupled plasma (ICP) emission spectroscopy. In the whole silica extraction process, extraction reagent can be reused through appended a small quantity of Na2CO3 to its initial concentration. The synthetic procedure is straightforward, inexpensive and environment-friendly, which was suitable for large-scale production. (C) 2010 Published by Elsevier B.V.

引用

页码：509 / 514

页数：6

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