采用纤蛇纹石制备纳米纤维状多孔氧化硅

以天然纤蛇纹石为原料,通过酸浸制备纳米纤维状多孔氧化硅,并使用X射线荧光光谱(XRF)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和N2吸附-脱附等温线技术等对其进行表征。研究结果表明:该多孔氧化硅具有独特的纳米纤维状形貌;其结构为无定形,结构组成单元仍为硅氧四面体,但四面体交替上下排列,六元环结构发生高度扭曲变形。纳米纤维状多孔氧化硅比表面积为391.8 m2/g,总孔容为1.05 cm3/g,由吸附-脱附等温线的滞后回线特征判断其结构中的孔主要为缝隙型孔。

Preparation of porous silica with nanofibrous morphology from chrysotile

Porous silica with nanofibrous morphology was prepared by acid leaching from natural chrysotile.X-ray fluorescence analysis(XRF),powder X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR) and N2 adsorption-desorption techniques were used to characterize the acid-leached products.The results show that the porous silica retains special nanofibrous morphology.The silica is amorphous and its structural unit is a SiO4 tetrahedron and six-member silicon-oxygen rings with the tetrahedral positioned alternately up and down in the six-member rings.The porous silica with nanofibrous morphology produces a high surface area of 391.8 m2/g and total pore volume of 1.05 cm3/g.The characteristic of hysteresis loop are mainly of slit-shaped pores.