| Abstrakt: |
A spherical α-Fe2O3 nano photocatalyst was successfully prepared via a simple process of chemical precipitation-calcination. The effects of solution end pH, ammonia concentration, and precursor calcination temperature on the morphology, structure, and properties of the as-prepared α-Fe2O3 particles were studied in detail using X‐ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible diffuse reflectance spectra techniques, and the excellent conditions for preparing spherical α-Fe2O3 nanoparticles with good dispersibility were obtained as follows: end pH was 8.9, ammonia concentration was 1.0 mol L–1, precursor calcination temperature was 400°C. The optical bandgap energy (Eg) of the as-prepared α-Fe2O3 particles can be estimated by Tauc’s equation to be 1.97 eV, and the strong and broad absorption in the visible light region (410–580 nm) presents its potential application as a visible light activate photocatalyst. In the presence of H2O2, the photocatalytic degradation rate of the as-prepared α-Fe2O3 nanoparticles to methyl orange (MO) and methylene blue (MB) is enhanced to 99% (150 min) and 97% (180 min), respectively, due to its role in forming more strong oxidizing •OH and inhibiting the recombination of electrons and holes. [ABSTRACT FROM AUTHOR] |
