Fabrication, Growth Mechanism, and Characterization of α-Fe₂O₃ Nanorods

Abstract

This work reports the facile synthesis of α-Fe(2)O(3) nanorods and nano-hexagons and its application as sunlight-driven photocatalysis. The obtained products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), scanning electron microscopy (SEM), diffused reflectance spectroscopy (DRUV-vis), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The phase and crystallinity were confirmed from the XRD study. Electron microscopy study clearly indicates the formation of different morphologies of nanocrystals. These hematite nanostructures were used as a model system for studying the shape-dependent photocatalytic degradation of phenol, methylene blue, and congo red. Amongst all the nanostructured semiconductors, Pt-doped hematite nanorod showed 55% efficiency towards the decolonization of methylene blue and 63% toward congo red under sun light illumination. The difference in photocatalytic activity is discussed in terms of their crystallize size and morphological ordering.

Efficient behaviour of hematite towards the photocatalytic degradation of NO gases

“…In fact, the BET surface areas measured were 5.1, 0.4 and 0.9 m 2 g −1 for samples NH, HRF-A and HRF-B, respectively. In the case of the NH sample, the value obtained is similar to that previously reported for ␣-Fe 2 O 3 nanopowders [49].…”

“…The low intensity band at 1649 cm −1 corresponds to the existence of large numbers of residual hydroxyl groups, which imply the O H vibrating mode of traces of adsorbed water. Conversely, the intense bands at lower frequencies, 573 and 470 cm −1 , could be attributed to Fe O vibration modes of ␣-Fe 2 O 3 [49]. New bands in the 800-1500 cm −1 range appear in the spectra obtained after irradiation.…”

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

“…12, before occula-tion, the hematite particles showed the following adsorption peaks. The adsorption peaks at 3439 cm and 1632 cm were attributed to the water of hydration; 45 The bending frequency of surface hydroxyl group was observed at 1392 cm; 46 And the adsorption peaks at 546 cm and 465 cm were assigned to Fe-O vibrational mode. 47 Aer occulation, these peaks all observed in hematite + APAS and hematite + TPAS.…”

Fabrication of magnetic and photocatalytic polyamide fabric coated with Fe2O3 particles

“…It is evident that the elements of silicon (101.97 eV) and iron (710.28 eV) are detected in the The sub-peak at 528.80 eV is ascribed to O atoms of PA fabric bound to Fe of Fe2O3 [39]. The sub-peak at 529.80 eV is attributed to O atoms bound to Fe of Fe2O3particles [40]. The sub-peaks at 531.10 and 535.27 eV are correlated to the O-Si and O-C functional groups, respectively [41].…”