文献类型：期刊文献

英文题名：Fe-containing mesoporous silicates with macro-lamellar morphology

作者：Lu, Yi[1]; Zheng, Junlin[2]; Liu, Jinku[1]; Mu, Jin[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[2]Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

年份：2007

卷号：106

期号：1-3

起止页码：28

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20074310887104);WOS:【SCI-EXPANDED(收录号:WOS:000251203400004)】；

语种：英文

外文关键词：mesoporous; MCM-41; Fe-containing silicates; lamellar; morphology

摘要：Fe-containing mesoporous silicates with macro-lamellar morphology were prepared using sodium silicates and Fe(NO3)(3) as silica and iron sources in alkaline media, respectively, under the direction of CTAB cationic surfactant. XRD and N-2 adsorption results showed that the sample had highly ordered hexagonal mesostructures typical of MCM-41. UV-vis and ESR spectra indicated that most of the iron species were tetrahedrally incorporated into the mesostructured framework in alkaline media. TEM micrographs manifested the macro-lamellar structures when the SiO2/Fe2O3 = 60 (molar ratio). Additionally, there were many submicron-sized structural defect voids in the mesostructured lamellas. The morphology character underwent huge changes with the increase of Fe(NO3)(3) amounts in the synthesis media. When the SiO2/Fe2O3 = 40, tangled microtubules with about several microns in length dominated the final product. Decreasing the SiO2/Fe2O3 molar ratio to 20, the long cylinders disappeared and 100-600 nm sticks represented 80% of the solid material. The dimensions of the resultant sample were reduced with the decrease of SiO2/Fe2O3 molar ratio. The formation mechanism of the macro-lamellar morphology was also proposed on the basis of the previous reports and our characterization results. (c) 2007 Elsevier Inc. All rights reserved.