الخلاصة:
In this work, we have used several synthesis procedures of alpha iron oxide nanoparticles for well-defined morphologies. Controlling the morphology strongly depends on the conditions and the method synthesis. For that, three methods synthesis were used Sol gel, hydrothermal and green chemistry.
Synthesis by sol gel allowed us to synthesize α-Fe2O3 nanoparticles size less than 100 nm by means of a polymeric resin treated at 450 °C, these nanoparticles showed a specific surface area of 20 m² / g and a degradation of 50% of MB under sunlight for 4.5h. Furthermore, the use of hydrothermal method enabled us to obtain nanoplatelets with dimensions of 300×150×10 and nanotubes with dimension of 100×80×60 nm using urea and phosphate ions, respectively. These nano-objects showed a degradation rate of 50% for the MB and 25% of isoproturon under sunlight irradiation. For ecological interest and to limit the use of chemicals we oriented to biosynthesis. In this study we used the olive leaf, rich in oleuropein, hydroxytyrosol and elenolic acid. These phenolic compounds have the property of chelating iron ions and act as a surfactant.
The use of olive leaf extracts allowed the synthesis of nanoparticles of about 30 nm in the form of an agglomerate surface area which reached 74 m² / g. these nanoparticles showed a degradation of 50% of linuron and gentian violet under solar radiation.
