Estudo da atividade fotocatalítica de filmes finos multicamadas de TiO2/CeO2.
The use of thin films in photocatalytic processes is widely studied because unlike materials in the form of powder, do not generate secondary residues. However, thin films must have good chemical stability and oxidative capacity, especially in reuse. In this work, TiO2/CeO2 multilayer thin films wer...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/40382 |
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| Resumo: | The use of thin films in photocatalytic processes is widely studied because unlike materials in the form of powder, do not generate secondary residues. However, thin films must have good chemical stability and oxidative capacity, especially in reuse. In this work, TiO2/CeO2 multilayer thin films were deposited by the spin coating method and calcined at 500 and 700 ° C. The thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy by field emission (FE-SEM), atomic force microscopy (AFM) and spectroscopy of diffuse reflectance. The photocatalytic properties were estimated by of the methylene blue dye concentration when illuminated by UV radiation. The XRD results show that temperatures of 500 and 700 ° C were effective for obtaining the TiO2 and CeO2 phases, without chemical interaction between the layers. At micrographs indicate that thin films of TiO2 are more homogeneous than those of CeO2 and that the increase in the calcination temperature generates thicker films due to increase in grain size. The difference in the homogeneity of TiO2 films and CeO2 is evident in AFM results, where the films show roughness average of 2,013 and 5,262 nm, respectively. TiO2/CeO2 multilayer thin films obtained at 700°C showed the best photocatalytic activity, reducing approximately 80% the MB concentration, while CeO2 and TiO2 pure films obtained at 700 ° C reduced only 20 and 29%, respectively. The reuse test showed that thin films maintain their photocatalytic activity even after 4 cycles, without the need for heat treatment, indicating that it is a photocatalyst immobilized in the degradation of organic dyes. |
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