Size and shape controlled of α-Fe2O3 nanoparticles prepared via sol–gel technique and their photocatalytic activity
Source abstract
Abstract
Haematite (α-Fe2O3) nanoparticles (NPs) of different sizes and morphologies were prepared from two different iron precursors (iron acetate (A) and iron nitrate (N)) using the sol–gel technique, through a reaction with oxalic acid. A pure α-Fe2O3 phase (rhombohedral) that contained particles of different sizes and shapes were obtained from both iron precursors. Transmission electron microscope measurements showed average sizes of 23 ± 2 and 30 ± 2 nm for α-Fe2O3 (A) and α-Fe2O3 (N) formed NPs, respectively. The observed uniform spherical shape for the α-Fe2O3 (A) formed NPs is due to the presence of carboxylic acid (acetic acid) used to control the nucleation and growth process of α-Fe2O3 NPs. However, quasi-spherical particle shapes for α-Fe2O3 (N) were produced in the presence of a mineral acid (nitric acid), which caused the particles to be constrained during their growth step. However, the optical analysis showed that the band gaps of α-Fe2O3 (A) and α-Fe2O3 (N) as 2.63 and 2.60 eV were found, respectively. The surface area results exhibited that both α-Fe2O3 NPs were a porous material with a higher area for α-Fe2O3 (A), which resulted from the uniform shape and smaller size of particles. The magnetic properties were observed to be slightly different for both α-Fe2O3 NPs, which were also attributed to the different particle size of the NPs. Higher photocatalytic activity for congo red dye and 4-chlorophenol degradation under sunlight was achieved by α-Fe2O3 (A), which was attributed to the smaller size and higher surface area compared to α-Fe2O3 (N) NPs.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Iron oxide chemistry and applications · Copper-based nanomaterials and applications · Advanced Photocatalysis Techniques
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