Self‐assembled three‐dimensional flower‐like α‐Fe₂O₃ nanostructures and their application in catalysis

Abstract

Three-dimensional flower-like α-Fe 2 O 3 nanostructures have been successfully synthesized by a simple surfactant-free environmental friendly solvolthermal process. The as-prepared products were investigated by X-ray powder diffraction, transmission electron microscopy, and field emission scanning electron microscopy. By adjusting the synthetic parameters, the shape of the α-Fe 2 O 3 nanostructures can be controlled. The three-dimensional flower-like α-Fe 2 O 3 nanostructures were found to be highly active as catalysts for phenol alkylation. The effects of various parameters, such as reaction temperature, reaction time and the amount of catalyst, were studied. The catalyst was stable and could be reused three times in normal atmosphere without suffering appreciable loss in catalytic activity.

The hydrothermal processing of iron oxides from bacterial biofilm waste as new nanomaterials for broad applications

“…These ower-like nanostructures have well-preserved hierarchical patterns of a-Fe 2 O 3 . 21,22 At high SEM magnication, the exterior of each of the nanostructure is composed of irregular sheets. This ower-like nanostructure is attributed to the presence of HCl in the solution.…”

Low Temperature Synthesis of Needle‐like α‐FeOOH and Their Conversion into α‐Fe2O3 Nanorods for Humidity Sensing Application

“…The α‐Fe 2 O 3 is an n ‐type semiconductor (Eg = 2.2 eV) and is a very important multifunctional material owing to its peculiar and excellent physicochemical properties such as low processing cost, high resistance to corrosion, and wide variety of potential uses in diverse fields such as catalysis, gas sensors, pigments, electrode material for lithium ion batteries, and in water treatment . Moreover, the chemical properties of α‐Fe 2 O 3 are found to be dependent on the particle size, morphology, dimensionality, and surface structure, which consequently attracted considerable focus on the synthesis of this material.…”

Tuning the Morphology of Metal Oxides for Catalytic Applications

“…175 Despite the lower surface area (18.3 m 2 /g) of the quasicubic ␣-Fe 2 O 3 than the flower-like one (39.9 m 2 /g), the superior performance of the cubes was attributed to the exclusive exposure of the {110} planes that had a much higher iron density (10.1 atoms/nm 2 ), facilitating the activation of CO. ␣-Fe 2 O 3 nanorods showed exceptionally high activity in CO oxidation and CH 4 combustion because of the preferentially exposed {110} planes. 260, 261 Such kind of shape-dependent catalytic behavior of ␣-Fe 2 O 3 has also been identified in liquidphase reactions [262][263][264][265] and photocatalysis. [266][267][268][269] Similar size and shape effects on the catalytic properties of ␥ -Fe 2 O 3 nanomaterials were also observed.…”