Preparation of magnetic fluorochromate hybrid nanomaterials with triphenylphosphine surface modified iron oxide nanoparticles and their characterization

摘要

In this study, a new magnetic hybrid nanomaterial Fe_3O_4@SiO_2@PPh_3@[CrO_3F]~-is instituted. Firstly, magnetic Fe_3O_4 nanoparticles have been synthesized by hydrothermal method. Next, the produced magnetic nanoparticles were covered with a silica shell via modified Stober method. Then, the core-shell magnetic nanoparticles system Fe_3O_4@SiO_2 functionalization was combined by utilizing (3-chloropropyl) trimethoxysilane and triphenylphosphine, to give the cationic part for immobilization of the anionic part of the Cr(Ⅵ) catalysts including [CrO_3F]~-. The structure of the catalyst after immobilization was investigated by 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) and XRD. Magnetization properties of nanoparticles were confirmed by vibrating sample magnetometer (VSM).