Synthesis and characterization ZnFe۲O۴@MnO and MnFe۲O۴@ZnO Magnetic Nanocomposites: Investigation of photocatalytic activity for the Degradation of Congo red under visible light irradiation

In the present investigation, ZnFe۲O۴@MnO and MnFe۲O۴@ZnO magnetic nanocomposites were fabricated via facile hydrothermal method and were calcined at ۳۰۰ °C for ۳ h. Synthesis of ZnFe۲O۴@MnO and MnFe۲O۴@ZnO magnetic nanocomposites optimized by the different weight percentages. The synthesized photocatalyst was characterized by (XRD), (FT-IR), (VSM), EDAX, (DRS) and (FESEM). The ZnFe۲O۴@MnO nanoparticles were found to have of ۲۰-۵۰ nm. Magnetic studies revealed that the ZnFe۲O۴@MnO and MnFe۲O۴@ZnO nanocomposites can be easily separated from the solution by an external magnetic field. The results demonstrated that the degradation efficiency of ZnFe۲O۴@MnO nanocomposite(۹۸.۵%) was better than that of MnFe۲O۴@ZnO nanocomposite(۹۰.۳۲%) in Congo red (CR) aqueous solution in ۳۵ min of visible light irradiation, which is due to the presence of narrow band gap energy of ZnFe۲O۴@MnO.Kinetics studies have displayed that the degradation of CR by the prepared of photocatalysts follows the pseudo-first-order kinetics and the rate constant achieved for ZnFe۲O۴@MnO (k = ۰.۰۳۷۱ min−۱) was much greater than of MnFe۲O۴@ZnO (k = ۰.۰۳۲۱ min−۱). The synthesized ZnFe۲O۴@MnO nanocomposite can be potentially applied as a magnetically separable photocatalyst to deal with water pollution problems.

کلیدواژه ها:

Magnetical nanocomposites ، hydrothermal method ، Congo Red ، Visible light ، photocatalytic activity