Document Type : Regular Article
Department of Chemistry, Faculty of Science, Golestan University, Gorgan, Iran
The spherical iron oxide (α Fe2O3) nanoparticles was prepared using facile, low-cost and environmental friendly one step thermal decomposition of Fe(NO3)3∙3H2O at the presence of malic acid (mass ration 1:1) at 600°C for 3 h. The product was characterized by Fourier transform infrared (FT-IR) spectroscopy, powder X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and transmission electron microscope (TEM). The FT-IR and XRD results predict the formation of single phase of rhombohedral α Fe2O3 nanoparticles. TEM image illustrated the α Fe2O3 nanoparticles were spherical shapes. VSM result show that the as-prepared α Fe2O3 nanoparticles is a ferromagnetic material with Ms of 1.96 emu/g. The photocatalytic activity of α Fe2O3 nanoparticles investigated by photodegradation of methyl orange (MO) and methyl blue (MB) in aqueous solution under visible light irradiation. The effect of pH solution, sorbent dose, contact time (0 – 120 min) and initial concentration of dyes (30, 50 and 70 mg/L) was studied. At the end of process, the catalyst could be separation and recovered using an external magnetic field. The results indicated that the α Fe2O3 nanoparticles could be used as an efficient photocatalyst for other dyes from aqueous solution and also beneficial to large-scale production.