S. Jain; U. Chandrawat
Abstract
Nickel titanium oxide (NiTiO3) nanoparticles were synthesized at low temperature in non aqueous medium by modified Pechini method using ethylene glycol and citric acid as polymeric precursors. The structural and morphological characteristics of the products were studied by X-ray diffraction, fourier ...
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Nickel titanium oxide (NiTiO3) nanoparticles were synthesized at low temperature in non aqueous medium by modified Pechini method using ethylene glycol and citric acid as polymeric precursors. The structural and morphological characteristics of the products were studied by X-ray diffraction, fourier transform infrared spectroscopy (FT-IR), UV-Visible diffuse reflectance spectroscopy (UV-DRS), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDAX). XRD patterns of powder revealed crystalline rhombohedral NiTiO3 obtained at 700 o C and this crystalinity increased with temperature. SEM images estimated that the grain sizes of NiTiO3 to be in the range 10–250 nm. DRS spectra reveal two peaks, one at around 440-450 nm and another one at around 740-750 nm. The band gap energy was calculated using Tauc plot and it was found to be 1.67 eV. In this study, photocatalytic properties of NiTiO3 on sulfamethoxazole drug degradation was investigated which has not been reported elsewhere and results shows that it is a prominent material for photodegradation of drug in the range of visible light.
S. Jain; K, Sharma; U. Chandrawat
Abstract
Nanosized perovskites BaBiO3 and BaBi4Ti4O15 were prepared using Pechini method. These structures were confirmed through thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Vis diffusion reflection spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron ...
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Nanosized perovskites BaBiO3 and BaBi4Ti4O15 were prepared using Pechini method. These structures were confirmed through thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Vis diffusion reflection spectroscopy (UV-Vis DRS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The XRD patterns suggest that BaBiO3 is crystalized in the monoclinic structure while a member of aurivillius family, bismuth-based layer-structured BaBi4Ti4O15 is crystalized in tetragonal structure. The band gap is calculated from the UV-Vis DRS and is found to be 2.07 eV and 1.80 eV for BaBiO3 and BaBi4Ti4O15, respectively. The low band gap and the UV-Vis DRS of BaBi4Ti4O15 showed a clear improvement in reflectance under visible light irradiation, indicating a new Ti doped nano BaBiO3 catalyst. Furthermore, the prepared nanosized perovskites were applied in the degradation of ibuprofen, one kind of non- steroidal anti-inflammatory drug, via photocatalytic processes. It is shown that BaBi4Ti4O15 exhibited drastic enhancement on degradation of drug under visible light irradiation compared to BaBiO3. The drug was also more efficiently mineralized in the BaBi4Ti4O15 photocatalytic process. The degradation pathway can be described as an interconnected successive principal decaroxylation, hydroxylation and demethylation steps.