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Deep eutectic solvent‐assisted synthesis of highly efficient nanocatalyst (n‐TiO 2 @TDI@DES (ZnCl 2 :urea)) for chemoselective oxidation of sulfides to sulfoxides
Author(s) -
Taghavi Shaghayegh,
Amoozadeh Ali,
Nemati Firouzeh
Publication year - 2021
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.6127
Subject(s) - chemistry , thermogravimetric analysis , catalysis , deep eutectic solvent , nanomaterial based catalyst , nanoparticle , fourier transform infrared spectroscopy , nuclear chemistry , sulfoxide , scanning electron microscope , hydrogen peroxide , chemical engineering , inorganic chemistry , organic chemistry , eutectic system , materials science , alloy , engineering , composite material
This study proposed a straightforward process to synthesize 2,4‐toluene diisocyanate (TDI)‐functionalized TiO 2 nanoparticles in which a cost‐effective linker (TDI) with high reactivity was employed to couple nano‐TiO 2 through covalent bonding to a deep eutectic solvent (DES). By this method, DES was successfully immobilized on the TiO 2 @TDI surface as an adsorbent and stabilizer. The structural, morphological, and physicochemical characteristics of the synthesized nanocatalysts were evaluated using various analytical methods including Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy equipped with energy‐dispersive X‐ray spectroscopy (SEM–EDX), and elemental analysis. The heterogeneity of the catalyst was also examined by a hot filtration test. The obtained TiO 2 @TDI@DES nanoparticles offered superior catalytic behavior and excellent yield as well as recyclability for the chemoselective oxidation of sulfide into sulfoxide using a green oxidant (hydrogen peroxide). This catalyst exhibited excellent reusability as it can be recovered for six successive cycles with no significant leach or reduction of catalytic efficiency.