Synthesizing Fe3O4, Mn3O4 and Mn3O4/Fe3O4 nanocatalysts using the sol-gel method as new precursors for the degradation of phenol by catalytic ozonation
نویسندگان
1 Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST)
2 Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST)
3 Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST)
doi
10.22104/jpst.2022.5798.1214چکیده
Ozone has received much attention in wastewater treatment as an impressive oxidation agent. In this work, three new metal complexes, [pyda.H][Fe(pydc)(pydc.H)].H2O, (I); [pyda.H][Fe(pydc)2].H2O, (II); and [pyda.H2]5[Mn(pydc.H)2].[pydc]5.8H2O, (III), where [pyda.H]+ = 2,6 -diaminopyridinium and [pydc]2- = 2,6 -pyridinedicarboxylate, have been synthesized by the ultrasonic-assisted synthesis method and then characterized by field emission scanning electron microscope (FE-SEM), Fourier-transform infrared (FT-IR) spectroscopy, thermogravimetric (TGA), and elemental analyses. According to the SEM image, the morphology of compound III was a nanorod. Compounds I, II, and III were then used as precursors for the preparation of Fe3O4, Mn3O4, and Mn3O4/Fe3O4 using the sol-gel and impregnation methods, respectively. Characterization of the synthesized nano-catalysts was carried out by FE-SEM, X-ray powder diffraction (XRD), and energy diffraction X-ray (EDX), the vibrating sample magnetometer (VSM) was replaced by magnetic studies. The VSM result showed that Fe3O4 and Mn3O4/Fe3O4 were superparamagnetic and ferromagnetic compounds, respectively. The Mn3O4, Mn3O4/Fe3O4, and Fe3O4 nanocatalysts were applied for the decomposition of phenol in an aqueous solution by catalytic ozonation. Phenol degradation efficiency was obtained as 97.26, 97.74, and 88.62 %, respectively.
