Preparation of Porous Silica with Nanofibrous Morphology from Chrysotile by Selective Leaching
Porous silica was obtained by acid leaching of chrysotile.The porous silica had been characterized by chemical analysis,powder X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FT-IR),and N2 adsorption-desorption techniques.It is shown in this study that the porous silica retains the nanofibrous morphology of the original chrysotile,and produces a high specific surface area (SBET) of 391.8 m2/g and total pore volume of 1.05 mL/g.The increase in SBET and the total pore volume of the porous silica reflect the formation of micropores of 1.2～1.5nm and mesopores of 3.2～3.8nm in diameter inside the porous structure.The hysteresis loop of N2 adsorption-desorption curve indicates mainly slit-shaped pores.The porous silica is amorphous,but its structure is regular to some extent.The structural unit of silica from chrysotile is a SiO4 tetrahedron and six-member silicon-oxygen rings with the tetrahedral positioned alternately up and down in the six-member rings.
Dorous silica Nanofibrous morphology
Y.X.Yang Q.M.Feng K.Liu G.F.Zhang L.M.Ou Y.P.Lu
School of Resource processing and Bioengineering,Central South University,Changsha,China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3311-3317
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）