K. Sharma; S. Jain; U. Chandrawat
Abstract
Nano sized BaBiO3 is prepared through Pechini method and characterized by SEM, XRD, FTIR, DT-TGA and UV DRS. The kinetic studies of adsorption and degradation phenomena involved in the photocatalytic degradation of Malachite Green dye using a batch reactor under visible light were investigated. Experiments ...
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Nano sized BaBiO3 is prepared through Pechini method and characterized by SEM, XRD, FTIR, DT-TGA and UV DRS. The kinetic studies of adsorption and degradation phenomena involved in the photocatalytic degradation of Malachite Green dye using a batch reactor under visible light were investigated. Experiments were performed in a suspended BaBiO3 photocatalyst system. The effect of catalyst loading, solution pH and initial dye concentration on dye degradation is investigated. In addition, adsorption experiment is also performed which indicates that adsorption pattern follows Langmuir model. The decomposition of Malachite Green dye follows pseudo first order kinetics and the Langmuir-Hinshelwood mechanism is found to be valid. Different kinetic parameters for adsorption and photocatalytic degradation of dye are also determined.
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.
