Preparation of nanostructures magnesium ferrite by ultrasound-assisted method and investigation Its photocatalytic activity to remove methylene blue from water

In this research, magnesium ferrite nanostructures have been prepared by the ultrasound-assisted method and for their structural, optical and magnetic characteristics, different methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Visible spectroscopy and vibrating sampling magnetometer (VSM), have been used. XRD pattern of the prepared magnesium ferrite nanostructures shows mixed cubic spinel phase. SEM images show a nearly spherical form of nanostructures and the mean nanoparticles size are about 10-15nm. Bandgap value of the prepared magnesium ferrite derived from UV-visible absorption spectra is 2.8eVwhich in comparison with its bulk value, a blue shift (0.62eV) due to the quantum confinement effect observed. The hysteresis loop of the prepared sample from the VSM analysis for the prepared magnesium ferrite nanostructures at room temperature shows a paramagnetic behavior. The optimum value of the pH of MB was 13. The intensity and spectrum of light source were engineered and the most efficient state has been used for the experiment. the results showed that within 45 minutes 99% of dye is degraded by magnesium ferrite nanostructures.