This study focuses on the synthesis of Co(II) and Cr(III) Schiff base complexes obtained from thiourea. The complexes were synthesized by template method and characterized by elemental analysis (CHNS), FT-IR, UVvis spectroscopy, conductivity measurement and magnetic moment. The spectroscopic studies suggested the octahedral and square-pyramidal structures for Co(II) and Cr(III) complexes, respectively. Then the complexes were used as precursors for preparation of Co 3 O 4 and Cr 2 O 3 nanoparticles via solid-state thermal decomposition without using a catalyst, toxic solvent, template or surfactant and complicated equipment, which makes it efficient, one-step, simple and environment-friendly. The chemical structure of the metal oxides is studied by FT-IR, XRD and SEM. To investigate the applications of the synthesized complexes, in the next step, the complexes were screened for antibacterial activity against clinically important bacteria such as Escherichia coli, Staphylococcus aureus, and Bacillus subtilis. The Cr(III) and Co(II) complexes showed good biological activity against all the tested bacteria. Also, the catalytic activities of the complexes were studied in toluene using non-toxic hydrogen peroxide as the oxidant. The results showed that Co(II) complex has catalytic activity for oxidation of toluene, but Cr(III) complex did not show any catalytic activity.
In this research, strontium titanate (SrTiO3), barium titanate (BaTiO3), barium strontium titanate (BaSrTiO3), and Ag-doped BaSrTiO3 nanocomposites with different Ag contents were fabricated using the sol–gel chemical route. The prepared
samples were characterized by several techniques including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), differential reflectance spectroscopy (DRS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR),
inductively coupled plasma spectroscopy (ICP), and Brunauer-Emmett-Teller (BET) measurement. The EDS results indicated that the synthesized nanoparticles had a cube perovskite-like structure. The EDS and ICP results revealed that Ag was doped into the Ba0.5Sr0.5TiO3
structure. The SEM and TEM images demonstrated that the particle size of 15 mol% Ag-doped Ba0.5Sr0.5TiO3 was smaller than that of pure Ba0.5Sr0.5TiO3 as confirmed by surface area results. The photocatalytic properties of undoped
titanate samples and Ag-doped Ba0.5Sr0.5TiO3 were studied by the photodecomposition of Eosin yellowish (EY) and methylene blue (MB) dyes. The results illustrated that the photodegradation efficiency of the Ag-doped Ba0.5Sr0.5TiO3
was far higher than the undoped titanate sample, and the optimum Ag doping was 15 mol%. The antibacterial activities of pure Ba0.5Sr0.5TiO3 and Ag-doped Ba0.5Sr0.5Ti03 were studied against Staphylococcus aureus as Gram-positive
(+) and Pseudomonas aeruginosa and Escherichia coli as Gram-negative (−) bacteria. In comparison with the bare Ba0.5Sr0.5TiO3 nanoparticles, the Ag-doped sample showed a significant enhancement in antibacterial activities against both Gram-negative
and Gram-positive bacterial strains.
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