Preparation and characterization of magnetic chlorochromate hybrid nanomaterials with triphenylphosphine surface-modified iron oxide nanoparticles

摘要

In this paper, a new magnetic hybrid nanomaterial (Fe~(3)O~(4)@SiO~(2)@PPh~(3)@[CrO~(3)Cl]) was reported for the first time. The magnetic Fe~(3)O~(4)nanoparticles were prepared by hydrothermal process and coated with a silica shell. Then, the core–shell nanoparticles (Fe~(3)O~(4)@SiO~(2)) were functionalized by 3-chloropropyl trimethoxysilane plus triphenylphosphine for forming the cationic part of support. Finally, anionic part of the Cr(VI) catalyst ([CrO~(3)Cl]_(?)) was immobilized on the magnetic support (Fe~(3)O~(4)@SiO~(2)@PPh~(3)). The structural characteristics of the product were determined using elemental analysis, X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and solid state UV–Vis. The particle size and morphology were identified by scanning electron microscope (SEM), transmission electron microscopy (TEM) and XRD. A vibrant sample was employed to determine the magnetic properties of the prepared samples.