Synthesis and characterization of magnetic dichromate hybrid nanomaterials with triphenylphosphine surface modified iron oxide nanoparticles (Fe_3O_4@SiO_2@PPh_3@Cr_2O_7~(2-))

摘要

In this study, a new magnetic hybrid nanomaterials Fe_3O_4@SiO_2@PPh_3@Cr_2O_7~(2-) is introduced. First, the magnetic Fe_3O_4 nanoparticles have been synthesized by co-precipitation method. Then, tetraethyl orthosilicate has been used for production of core-shell nanoparticles Fe_3O_4@SiO_2. The core-shell magnetic nanoparticles system Fe_3O_4@SiO_2 functionalization was synthesized using (3-chloropropyl) trimethoxysilane and triphenylphosphine and the cationic part was prepared for immobilization of anionic part of the Cr (VI) catalysts including Cr_2O_7~(2-). After immobilization of the catalyst, its structure was detected by using Fourier transform infrared (FT-IR), solid state UV—Vis, elemental analysis, X-ray fluorescence (XRF), X-ray diffraction (XRD) and the particle size and morphology were elaborated by scanning electron microscope (SEM) and XRD. Magnetism properties were quantified by vibrating sample magnetometer (VSM).