Tin-derivative sandwich-type polyoxometalates supported on Nd-doped TiO2 nanoparticles as efficient and reusable catalysts in the oxidation of sulfides and alcohols
New nanocomposites, including different loading levels of sandwich-type polyoxometalates [(HOSnIVOH)3(XW9O34)2] n− (X = As (1), P (2) n = 12 and Si (3) n = 14) on Nd-doped TiO2 nanoparticles were prepared by a simple impregnation method. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, Fourier transform infrared (FTIR), and energy-dispersive X-ray spectroscopy. Compounds 1–3 were successfully loaded on Nd-doped crystallized anatase-phase TiO2 nanoparticles of 20–25 nm. Catalytic activities of nanocomposites were examined by carrying out the oxidation of sulfides and alcohols with H2O2. Simple synthesis method, reusability, and low amounts of the heterogeneous catalysts with a slight excess of H2O2 and mild reaction conditions make these oxidation reactions an environmentally benign chemical process.
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