Photocatalytic properties of BiOCl-TiO2 composites for phenol photodegradation
"BiOCl-TiO2 composites were synthesized by sol-gel method; using two commercial BiOCl (P2600 and SB) with different BiOCl-TiO2 weight ratios. They were characterized by different techniques such as X-ray diffraction (XRD), electron microscopy (SEM, HRTEM and TEM), Fourier transform infrared (FT...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2018 |
| País: | México |
| Institución: | Instituto Potosino de Investigación Científica y Tecnológica |
| Repositorio: | Repositorio Institucional del IPICYT |
| OAI Identifier: | oai:ipicyt.repositorioinstitucional.mx:1010/2133 |
| Acceso en línea: | http://ipicyt.repositorioinstitucional.mx/jspui/handle/1010/2133 |
| Access Level: | acceso embargado |
| Palabra clave: | info:eu-repo/classification/Autor/BiOCl info:eu-repo/classification/Autor/TiO2 info:eu-repo/classification/Autor/Photocatalysis info:eu-repo/classification/Autor/Phenol info:eu-repo/classification/Autor/Visible light info:eu-repo/classification/cti/7 |
| Sumario: | "BiOCl-TiO2 composites were synthesized by sol-gel method; using two commercial BiOCl (P2600 and SB) with different BiOCl-TiO2 weight ratios. They were characterized by different techniques such as X-ray diffraction (XRD), electron microscopy (SEM, HRTEM and TEM), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), time resolved micro-wave conductivity (TRMC) and UV–vis diffuse reflectance spectroscopy (UV-DRS). In addition, these composites (BiOCl-TiO2) were evaluated for the photodegradation of phenol (50?mgL?1) under visible irradiation (??>?450?nm). The results showed effective phenol degradation with the PTi-75 composite, which has 75% by weight of TiO2, obtaining up to 40% of degradation during 6?h of reaction. The SEM analysis showed that micro-sheets of BiOCl are irregularly embedded on agglomerates of TiO2 nanoparticles. A mechanism was proposed, which considers the excitation by the overlap of the BiOCl-TiO2 bands; where the TiO2 has a conduction band more electronegative than that of BiOCl, allowing that TiO2 electron of the conduction band can be transferred to conduction band of BiOCl; while the holes present in the valence band of BiOCl can be moved to TiO2 valence band preventing the electron-holes recombination." |
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