Characterization and Cu（Ⅱ）adsorption property of rice-husk-char-based porous silica with large specific surface area

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%2 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）相似文献