Synthesis and characterization of a new magnetic nanocomposite with metalloporphyrin (Co-TPyP) and sulfated tin dioxide (Fe3O4@SnO2/SO42-), and investigation of its photocatalytic effects in the degradation of Rhodamine B

To achieve the synthesis of (Fe3O4@SnO2/SO42-), after the preparation of magnetic nanoparticles of Fe3O4 (MNP), tin dioxide was supported on the MNP, and it was sulfated using ammonium sulfate. To improve the photocatalytic activity of this magnetic nanocatalyst, after the synthesis of 5,10,15,20-tetra(4-pyridyl) porphyrin and its cobalt metalloporphyrin, (Co-TPyP) was stabilized on Fe3O4@SnO2/SO42-. The structure and morphology were characterized by XRD, EDX, FT-IR, SEM and FE-SEM. The X-ray diffraction studies showed tetragonal SnO2 and the orthorhombic structure of Fe3O4. The Fe3O4@SnO2/SO42- is an acidic heterogeneous nanocatalyst with excellent magnetic properties and can be easily separated from the reaction mixture by an external magnetic field. The photocatalytic activity was investigated by studying the photodegradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation. The simplicity of the workup processes, the low cost of the catalyst and its high efficiency in the degradation of RhB are outstanding advantages of this procedure.