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.
A. Harlina; M. N. Nur Nazmi Liyana; H. B. Nurul Syuhada; I. Norli
Abstract
Rice field is one of the agriculture areas in Malaysia that is exposed to the usage of pesticide before the paddy planting phase, during vegetative phase and the post- harvesting phase. The study was to determine the water quality and also degradation of isoprothiolane in paddy field water samples. Isoprothiolane ...
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Rice field is one of the agriculture areas in Malaysia that is exposed to the usage of pesticide before the paddy planting phase, during vegetative phase and the post- harvesting phase. The study was to determine the water quality and also degradation of isoprothiolane in paddy field water samples. Isoprothiolane is one of the fungicides that is used during the vegetative phase to kill the fungi on the paddies. This study of isoprothiolane degradation in water samples was conducted in four different conditions, namely autoclaved water sample exposed to sunlight, autoclaved water sample kept in dark, non-autoclave water sample exposed to sunlight and non-autoclaved water sample kept in dark via laboratory batch experiment in a course of 30 days. The extraction and determination of the isoprothiolane in the water samples were done by solid phase extraction method (SPE) and analyzed by Gas Chromatography–Mass Spectrometry (GC-MS). The study revealed that isoprothiolane degraded very slowly in all four conditions within 30 days of observation, and the degradation rates ranged from 0.0003 to 0.0037 day-1. The study also proved that the residue of isoprothiolane remained at least a month after its application.
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.
