摘要：

以热解稻壳炭为原料，H3PO4为酸化剂，聚乙二醇为模板剂，制得了多孔氧化硅；采用N2吸脱附、X射线荧光光谱、X射线能谱、X射线衍射等测试技术表征了制得的多孔氧化硅，采用批量吸附实验考察了它对水溶液中Cu（Ⅱ）的吸附特性。结果表明：以稻壳炭为原料，可以在10 h内制得比表面积达957 m²·g^-1、二氧化硅含量为99.26%的无定形多孔氧化硅；该氧化硅含有中孔与微孔，中孔率为38.6%

Abstract:

Porous silica with a large specific surface area (SSA）was prepared from rice husk char (RHC）by adding H3PO4 to sodium silicate solution (SSS）until the solution reached pH 4.1.The preparation process consisted of formation of SSS from RHC, that of silica-polyethylene glycol (PEG）composite by using SSS, H3PO4 and PEG, and calcination of the composites.The porous silica as-prepared was characterized by N₂ adsorption, X-ray fluorescence, X-ray energy dispersive spectrometer, X-ray diffraction, and Fourier transform infrared spectroscopy.Their characters for Cu（Ⅱ）adsorption were investigated by batch adsorption experiments.The results show that amorphous silica with specific surface area of 957 m2·g^-1and silica content of 99.26% can be obtained from rice husk char within 10 h.The porous silica contains both micropores and mesopores, with the mesopore fraction up to 38.6%.The advisable contact time and solution pH for Cu（Ⅱ）adsorption required are higher than 2 h and 6.0, respectively.The largest adsorption capacity and highest removal efficiency for Cu（Ⅱ）at initial Cu（Ⅱ）

中图分类号: 

• 10.3969/j.issn.0438-1157.2011.12.019