التفاصيل البيبلوغرافية
| العنوان: |
Effect of temperature on the photocatalytic properties of TiO2-CeO2 multilayer thin films obtained by spin coating method. |
| Alternate Title: |
Efeito da temperatura nas propriedades fotocatalíticas de filmes finos multicamadas de TiO2-CeO2 obtidos por spin coating. (Portuguese) |
| المؤلفون: |
Nunes, T. B. O., Neto, N. F. Andrade, Garcia, L. M. P., Nascimento, R. M., Bomio, M. R. D., Motta, F. V. |
| المصدر: |
Ceramica; Apr-Jun2020, Vol. 66 Issue 378, p145-153, 9p |
| مصطلحات موضوعية: |
SPIN coating, THIN films, MULTILAYERED thin films, TEMPERATURE effect, FIELD emission electron microscopy, ATOMIC force microscopy |
| Abstract (English): |
TiO2-CeO2 multilayer thin films were deposited by the spin coating method and calcined at 500 and 700 °C. Thin films were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and diffuse reflectance spectroscopy. Photocatalytic properties were estimated by varying the concentration of the methylene blue dye (MB) when illuminated by UV radiation. The XRD patterns showed that the temperatures of 500 and 700 °C were effective to obtain TiO2 and CeO2 phases. The difference in the homogeneity of TiO2 and CeO2 films was evident in the AFM images, where the films showed an average roughness of 2.0 and 5.3 nm, respectively. The CeO2-TiO2 thin film obtained at 700 °C showed the best photocatalytic activity, reducing the concentration of MB by approximately 80%, while the CeO2 and TiO2 films obtained at 700 °C reduced only 20% and 29%, respectively. The reuse test showed that the thin films maintained their photocatalytic activity after 4 cycles, and there was no need for thermal treatment, indicating that it is an immobilized photocatalyst with high efficiency in the degradation of organic dyes. [ABSTRACT FROM AUTHOR] |
| Abstract (Portuguese): |
Filmes finos multicamadas de TiO2-CeO2 foram depositados pelo método de spin coating e calcinados a 500 e 700 °C. Os filmes finos foram caracterizados por difração de raios-X (DRX), microscopia eletrônica de varredura por emissão de campo (MEVFEG), microscopia de força atômica (MFA) e espectroscopia de reflectância difusa. As propriedades fotocatalíticas foram estimadas variando a concentração do corante azul de metileno (AM) quando iluminado por radiação UV. Os padrões de DRX mostraram que as temperaturas de 500 e 700 °C foram efetivas para obter as fases de TiO2 e CeO2. A diferença na homogeneidade dos filmes de TiO2 e CeO2 foi evidente nas imagens de MFA, onde os filmes apresentaram rugosidade média de 2,0 e 5,3 nm, respectivamente. Filme fino de TiO2-CeO2 obtido a 700 °C apresentou a melhor atividade fotocatalítica, reduzindo a concentração de AM em aproximadamente 80%, enquanto os filmes de CeO2 e TiO2 obtidos a 700 °C reduziram apenas 20% e 29%, respectivamente. O teste de reutilização mostrou que os filmes finos mantiveram sua atividade após 4 ciclos, não havendo necessidade de tratamento térmico, indicando ser um fotocatalisador imobilizado com alta eficiência na degradação do corante orgânico. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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