一步直接水热法合成高铁含量新型磁性有序介孔纳米复合材料

Direct hydrothermal synthesis of novel ordered magnetic mesoporous nanocomposites with high content of iron

采用一步水热原位掺杂制得高比表面积的新型磁性有序介孔纳米复合材料,铁含量在较宽的范围(质量分数1.2%～35.8%)可调。采用X射线粉末衍射(XRD)、N_2吸附-脱附、扫描电镜(SEM)、透射电镜(TEM)及紫外可见漫反射光谱(UV-vis DRS)等手段对材料的晶相结构、孔结构和形貌等进行了研究。通过调节铁源与硅源的配比,在合适的铁负载量条件下,可以得到纳米氧化铁颗粒分布均匀的高比表面积介孔纳米复合材料。

Mesoporous iron oxide silicate nanocomposites Fe2O3-SBA-15 with iron loadings in the range of 1.2wt% -35.8wt% were synthesized by a simple direct hydrothermal method. The as-synthesized samples were characterized by XRD, SEM, UV-vis DRS, TEM and N2 adsorption-desorption. The characterization results showed that mesoporous nanocomposites Fe203-SBA-15 with well-dispersed nanoclusters of iron oxide in the walls of ordered mesoporous silica structures and high surface area were attained under the condition of adjustment of Fe/Si molar ratios and appropriate Fe loadings.