Authors: Jiansheng Li Y S Lin
Publish Date: 2008/09/01
Volume: 43, Issue: 18, Pages: 6359-6365
Abstract
A series of ordered mesoporous silica loaded with iron oxide was synthesized by facile onestep solgel route using Pluronic P123 as the template tetraethylorthosilicate as the silica source and hydrated iron nitrite as the precursor under acid conditions The assynthesized materials with Fe/Si molar ratio ranging from 01 to 08 were characterized by Xray diffraction XRD transmission electron microscopy TEM vibrating sample magnetometry VSM and N2 adsorption porosimetry All samples possess ordered hexagonal mesoporous structure similar to SBA15 with a high surface area large pore volume and uniform pore size Although higher iron content causes a distortion of hexagonal ordering structure to some extent the materials still maintain the ordered mesopore structure even with Fe/Si molar ratio as high as 08 Pore structure and TEM data suggest that iron oxide nanoparticles are buried within the silica wall and increasing the iron oxide loading has little effects on the pore structure of the mesoporous silica VSM results show assynthesized samples exhibit superparamagnetic behaviorThis work was supported by Petroleum Research Fund Administered by the American Chemical Society Natural Science Foundation of Jiangsu Province grant noBK2006205 and Young Scholar Science Foundation of Nanjing University of Science Technology grant noNJUST 200502 JSL is grateful to China Scholarship Council for a fellowship to support his visit to ASU
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