Preparation and characterization of a mixed oxide based on iron

Abstract

Framework guide to complete the master's thesis, the research work is dedicated to synthesizing a mixed oxide material type Bi-Fe-O through the sol-gel method. This material is calcined at 300°C for 5 hours and then characterized by numerous analysis techniques: Fourrier transform Infrared spectroscopy (FTIR), X-ray fluorescence (XRF) and X-ray diffraction (XRD), scanning electron microscopy (SEM). The median crystallite size is evaluated by the empirical law of Debye -Scherrer. The IR spectrum indicates the presence of vibration bands characteristic of O-M (Bi -O - Fe: Bi- O; Fe - O) stretching mode. The TGA thermogram shows the formation Bi-Fe-O mixed oxide starts over 400°C. The XRD analysis shows the presence of only the Bi203 phase and the absence of the perovskite BiFeO3 phase. The median crystallite size estimated using the Debye Scherrer formula is around 28 nm. (SEM) assisted with EDX Energy Dispersive X-ray spectroscopy. E illustrates the spotting of porous surface morphology with heterogeneous particles size from 5μm to 20 μm. EDX shows that a major part of the surface in the sample is covered with bismuth and iron more than oxygen, XRF analysis shows the major atomic elements with experimental percentages 68,52% for bismuth and 22,04% for iron. Key Words: Synthesis, Photocatalyst, Hydrogen, Mixed-oxide, Sol-gel.