چكيده به لاتين
In recent years, CuFe2O4 particles have received much attention due to their excellent magnetic properties, high electrical conductivity and thermal stability, and effective photocatalytic activity. In this study, CuFe2O4 and CuFe2O4/RGO nanoparticles and nanocomposites were synthesized using two methods of solution combustion and solvothermal combustion. Structure, morphology, magnetic and optical properties of the powders were obtained based on glycine fuel ratios of 1, 1.5 and 2 and graphene oxide values of 0, 5, 10 and 15 wt% in solution combustion method and the effect of water / ethylene glycol (10-50 cc) solvents in synthesized samples at 180 oC and 6 h time in solvothermal method were investigated using different characterization methods. The results of phase analysis showed that Cu2O and Cu in the solution combustion method and Cu2O and Cu as side phases formed alongside the main phase. Graphene oxide reduction during the combustion process was demonstrated by Raman spectroscopy with the presence of D and G peaks. Also, microstructural examination revealed that CuFe2O4 nanoparticles were distributed on RGO sheets. It was observed that by increasing the fuel ratio in the solution combustion method, the porosity of the structure increased. The particles had a plate-like morphology in the solution combustion method, but in the solvothermal method, particles with a spherical morphology were formed. The particle size obtained in the solvothermal method was smaller than that of the solution combustion method in the range of 15-20 nm. The saturation magnetization and coercivity values were 70/79 and 275 Oe for solution combustion samples and 46.18 and 52.45 Oe for synthesized solvothermal samples, respectively. The photocatalytic performance of the samples prepared by both methods was also studied for the degradation of organic dyes of methylene blue and methyl orange in the visible region. The results showed that, in general, the photocatalytic performance was strongly influenced by the unwanted and secondary phases. Thus, the amount of photocatalytic degradation reached 99% in the sample synthesized by a solvothermal method where no Cu2O was formed. Also, in the solution combustion method, increasing the GO and fuel, increased the methylene blue degradation rate by 92%. In addition, kinetic studies showed that by varying the pH from 2 to 9, the degradation rate of methylene blue for two different samples synthesized by both solvothermal and solution combustion methods reached 99% and 98%, respectively. Using Langmuir–Hinshelwood (LH) kinetic model, velocity constant values for the two samples G2G10 and 50E-10 were obtained 0.024 and 0.021 (min-1), respectively.