New Nanoparticles of NiFe2O4@SiO2 based Tungstate Interphase: a Highly Efficient and Selective Catalyst for the Oxidation of Sulfides to Sulfoxides

The study synthesized the novel recoverable alkyl ammonium tungstate (AAT) immobilized on the NiFe2O4@SiO2 solid phase (NiFe2O4@SiO2-AAT) for the selective oxidation of sulfide to sulfoxide. The catalyst has been characterized by different methods like XRD, FE-SEM, VSM, EDS, FT-IR, and TGA/DTA. The XRD pattern shows the distinctive peaks related to the cubic phase of NiFe2O4. The catalyst also shows good magnetic characteristics (Ms=2.5 emu/g) and thermal stability (up to 280°C). This protocol displays good activity as the catalyst leads to high yields of sulfoxides (85-99% yields) and performs the green metrics as the catalyst could be recovered 10 times.