Optimization of photocatalytic degradation of methyl orange using immobilized scoria-Ni/TiO2 nanoparticles
- Department of Environmental Health Engineering, Faculty of Health, Kermanshah University of Medical Sciences, Kermanshah, IR Research Center for Environmental Determinants of Health, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, IR
- School of Public Health, Tehran University of Medical Sciences, Tehran, IR Center for Water Quality Research, Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, IR
- School of Public Health, Tehran University of Medical Sciences, Tehran, IR Students Research Committee, Kermanshah University of Medical Sciences, Kermanshah, IR
- Department of Environmental Health Engineering, Faculty of Health, Kurdistan University of Medical Sciences, Sanandaj, IR
- Research Center for Environmental Determinants of Health, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, IR
Published in Issue 19-03-2020
How to Cite
Pirsaheb, M., Hossaini, H., Nasseri, S., Azizi, N., Shahmoradi, B., & Khosravi, T. (2020). Optimization of photocatalytic degradation of methyl orange using immobilized scoria-Ni/TiO2 nanoparticles. Journal of Nanostructure in Chemistry, 10(2 (June 2020). https://doi.org/10.1007/s40097-020-00337-x
Abstract
Abstract In this study, the photocatalytic efficiency of scoria-Ni/TiO 2 nanoparticles is evaluated for methyl orange removal under both the ultraviolet (UV) and sunlight irradiations. The synthesized catalysts are characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectra (DRS), scanning electron microscope (SEM), and energy dispersive X-ray analysis (EDAX) analysis. According to the results, the absorption edge of TiO 2 alternated to visible light successfully, and the SEM and EDAX analysis approved that the particles, which are in nano-size, doped on the scoria. The effect of pH, catalyst dosage, methyl orange concentration, and contact time on efficiency was assessed. The initial experiment revealed that 0.05% and 0.1% of nickel have more efficiency while using the sun and UV light sources, respectively. In a 50-ml lab-scale reactor, methyl orange removal efficiency by scoria-Ni/TiO 2 was 95.89 and 93.97% under UV and sunlight irradiation, respectively, within 45 min contact time while it was 26.7 and 45.9% under the sun and UV light irradiation, respectively, for commercial TiO 2 . In addition, the reaction kinetics followed the Langmuir–Hinshelwood model. Finally, radical production and catalytic activity of Ni/TiO 2 verified by significant decrease in removal efficiency due to surface and solution radical scavengers addition. Graphic abstractKeywords
- Methyl orange,
- Ni/TiO2,
- UV light,
- Sunlight,
- Scoria
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