Preparation and Characterization of Mesoporous Iron-Oxide

Transition metal oxides are easy to form insoluble oligomer in reaction because of complicated oxidation states,so it is difficult to obtain the desired mesoporous structure.To resolve the problem,mesoporous iron oxide was synthesized by reacting a micellar phase of sodium dodecyl sulfate(SDS) with iron polymer solution which was prepared by controlling the proportion of sodium hydroxide and ferric chloride.Crystal structure and surface structure of the mesoporous iron oxide was characterized by powder X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FT-IR),thermogravimetric analyse(TGA),Nitrogen adsorption-desorption method and so on.The results show that mesoporous α-Fe2O3 can be obtained after calcining at 450℃ with OH-/Fe3+ ratio of 2.0.Its surface area is 146.5m2·g-1,BJH average diameter is 6.9nm,pore volume is 0.27cm3·g-1.The as-prepared mesoporous iron oxide has better thermal stability,it still has surface area of 110.2m2·g-1 after calcination at 550℃.