Cristalização hidrotérmica do gel de TiO2 obtido pelo método de decomposição de complexos e análise de suas propriedades fotocatalíticas
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Data
2018-10-10
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Universidade Federal de Goiás
Resumo
In recent years, titanium dioxide TiO2 has been well studied due to its various interesting
physical and chemical properties, especially with regard to the application in processes of
photocatalytic discoloration. These processes have always attracted the interest of the
scientific community, mainly because it is possible to use sunlight as a source of energy for
the reaction to happen. The present work had the objective of studying the influence of pH on
the hydrothermal crystallization of the amorphous (TiO2) gel obtained by the complex
decomposition method by two different routes varying temperature and time of synthesis,
where in one of the routes the materials were crystallized in a reactor metal and on the other
synthetic route was used a glass reactor. Such routes were used as a relatively new,
promising and efficient processing method for obtaining this type of material. The obtained
samples were characterized by different techniques: the X-ray diffraction confirmed the
obtaining of monophasic materials and also in mixtures of phases, with tetragonal structure
for the polymorphs anatase and rutile, proving that the hydrothermal method is efficient in
the synthesis of the samples of interest having energy expenditure when compared to
conventional crystallization methods. Using the X-ray diffraction data, the sizes of crystallites
(TC), and the percentage values of phases present in each sample were measured. The
(MEV/FEG) scanning electron microscopy characterization and (TEM) transmission, evidenced
the changes in the size and morphology of the materials obtained, especially between anatase
and rutile when single-phase. The photocatalytic tests showed the best performance of some
materials, especially for the sample crystallized in pH 7 in the glass reactor, which decoloured
the study dye in 99.7% due to its morphology as well as anatase / rutile composition in percentage terms.
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Palavras-chave
Dióxido de titânio (TiO2), Cristalização hidrotérmica, Anatase, Rutilo, PH, Fotocatálise, Titanium dioxide (TiO2), Hydrothermal crystallization, Anatase, Rutile, PH, Photocatalysis
Citação
GOMES, Y. G. S. Cristalização hidrotérmica do gel de TiO2 obtido pelo método de decomposição de complexos e análise de suas propriedades fotocatalíticas. 2018. 78 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2018.