OICC Press Iranian Journal of Catalysis 2345-4865 14 4 2024 11 23 New Nanoparticles of NiFe2O4@SiO2 based Tungstate Interphase: a Highly Efficient and Selective Catalyst for the Oxidation of Sulfides to Sulfoxides 1 12 10.57647/j.ijc.2024.1404.39 EN Mohammad Reza Mohammad Shafiee Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran https://orcid.org/0000-0002-2807-6766 Mahnaz Mirheidari Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran , Arshia Eilbeigi Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran Journal Article 2024 11 23 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. Research Highlights New nanoparticles of NiFe2O4@SiO2-based tungstate interphase were prepared. The as-prepared nanoparticles were used for the selective oxidation of sulfides to sulfoxides. The catalyst has been characterized by different methods like XRD, FE-SEM, VSM, EDS, and TGA/DTA. The results revealed high-yield oxidation products up to 99%.