Hydrothermal Synthesis and Characterization of an Akaganeite-type Iron Oxide Octahedral Molecular Sieves
E. Nicolas-Tolentino and P. Alfornon (pp. 1-10)
Abstract
Iron oxide octahedral molecular sieve with 2×2 tunnel, designated as FeOx-OMS (2×2) was successfully synthesized by hydrothermal method. FeOx-OMS (2×2) has a high degree of purity and higher thermal stability than those of previously reported akaganeite-type materials. The X-ray powder diffraction (XRD) pattern shows peaks that are characteristic of pure akaganeite-system. Based on its TGA profile, its thermal stability is reported up to 255 ℃, and beyond 402 ℃, new phases are formed which is a mixture of hematite and magnetite based on its XRD pattern. The SEM result shows needle-like morphology that is typical of a tunnel structure.