Formation Fe₂O₃Nanowalls through Solvent-Assisted Hydrothermal Process and Their Application for Titan Yellow GR Dye Degradation

Hematite iron oxide (<TEX>α</TEX>-<TEX>Fe₂O₃</TEX>) nanowalls were fabricated on aluminum substrate by a facile solvent-assisted hydrothermal oxidation process. The XRD and EDS patterns indicate that the sample has a rhombohedral phase of hematite <TEX>Fe₂O₃</TEX>. FE-SEM, TEM, HR-TEM, SA-ED were employed to characterize the resulting materials. <TEX>N₂</TEX> adsorption-desorption isotherms was used to study a BET surface area. Their capability of catalytic degradation of titan yellow GR azo dye with air oxygen in aqueous solution over <TEX>Fe₂O₃</TEX> catalysts was studied. The result indicates that the as-prepared product has a high catalytic activity, because it has a larger surface area. Langmuir and Freundlich isotherms of adsorption dye on the catalysts surface were investigated and the decomposition of titan yellow GR follows pseudo-first order kinetic.