Journal
SOLID STATE SCIENCES
Volume 65, Issue -, Pages 15-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2017.01.001
Keywords
BiOBr microspheres; Methyl orange; Photocatalysis; pH
Funding
- Institutional Improvement Plan in Energy Efficiency and Environmental Sustainability (Plan de Mejoramiento Institutional en Eficiencia Energetica y Sustentabilidad Ambiental) of Universidad de La Serena [PMI ULS 1401]
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BiOBr microspheres were obtained using a solvothermal synthesis route in the presence of ethylene glycol and KBr at 145 degrees C, for 18 h. BiOBr microspheres were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), nitrogen adsorption-desorption isotherms analysis, diffuse reflectance spectroscopy (DRS), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Additionally, the theoretical and experimental isoelectric points (IEP) of BiOBr nanostructured microspheres were determined, and pH's influence on the degradation of an anionic dye (methyl orange) under simulated solar radiation was analyzed. Results show that 97% of methyl orange is removed at pH 2 after 60 min of photocatalytic reaction. Finally, DRIFTS studies permit the proposal of a surface reaction mechanism of the photocatalytic oxidation of MO using BiOBr microspheres. (C) 2017 Elsevier Masson SAS. All rights reserved.
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