Wastewater treatment using Fe-doped perovskite manganites by photocatalytic degradation of methyl orange,crystal violet and indigo carmine dyes in tungsten bulb/sunlight |
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| Affiliation: | 1. Physics Department, College of Science, Najran University, Najran, P.O. Box 1988, Najran 11001, Saudi Arabia;2. Nanostructured Materials and Nanotechnology Division, Central Metallurgical Research and Development Institute (CMRDI), P.O. Box: 87 Helwan, Cairo 11421, Egypt;3. Advanced Materials and Nano-Research Centre, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia;4. Reactor Physics Department, NRC, Atomic Energy Authority, Abou Zabaal P.O. Box 13759, Cairo, Egypt;5. Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia;6. Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt |
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| Abstract: | We documented (i) the decolorization of wastewater in visible light, which contains methyl orange, crystal violet and indigo carmine dyes, using La0.7Sr0.3Mn1–xFexO3 (x = 0.0, 0.05, 0.1 and 0.5) manganites and (ii) efficient separation of photocatalysts from water using magnetic field. These ceramic photocatalysts were sintered at 1050 °C for 12 h. Ceramics were characterized by X-ray diffraction (XRD), soft X-ray absorption spectroscopy (SXAS), Fourier transform infrared spectroscopy (FTIR) and UV–visible diffuse reflectance spectroscopy (DRS). SXAS studies show the presence of Mn (Mn3+/Mn4+) and Fe (Fe3+/Fe4+) mixes valences in Fe-doped compositions. Optical band gap is found in visible light range for La0.7Sr0.3Mn1–xFexO3 (x = 0.0, 0.05, 0.1) compositions. La0.7Sr0.3MnO3 degrades 94.6% methyl orange in 7 min, 81.9% crystal violet in 10 min and 99.1% indigo carmine in 5 min. La0.7Sr0.3Mn0.9Fe0.1O3 degrades the 92.6% methyl orange dye solution in 9 min, 94.8% crystal violet in 25 min and 97.1% indigo carmine in 3 min. Parent and Fe doped manganites can be separated in 60 s from wastewater. |
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| Keywords: | Synchrotron X-ray absorption Dye degradation Magnetic separation Mixed valences Rare earths Wastewater treatment |
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