Síntese e caracterização de SrSnO3 e ZnSnO3 obtidos pelo método de coprecipitação sem e com tratamento hidrotérmico assistido por micro-ondas
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Data
2018-02-27
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Universidade Federal de Goiás
Resumo
The development of ceramic materials is important for the advancement of new
technologies and the emergence of new economically viable materials. Modifying the
synthesis method and relating its physical and chemical characteristics to possible
industrial applications is part of the improvement process and offers alternatives to current
production in improving the final product. In the present work, the synthesis and structural
characterization of strontium and zinc stannates by the co-precipitation method, with and
without microwave-assisted hydrothermal treatment, was carried out. The interest in the
study with the application of the microwaves is in the sense of reducing the time and
temperature of obtaining the main phase, perovskite. From the results of X-ray diffraction
(XRD) it was possible to identify the formation of strontium and zinc stannates,
monophasic after the addition of polyethylene glycol. The strontium stannate perovskite
phase was obtained from the methodology with and without hydrothermal treatment
assisted by microwave after calcination at 600 ºC for 2 hours. The zinc stannate with
perovskite structure was obtained by the methodology with and without hydrothermal
treatment assisted by microwaves without calcination. From the UV-VIS results optical
values were obtained using Wood and Tauc theory. These values were all compatible with
semiconductor materials, values between 2 and 4 eV. The images of the Electronic
Transmission Electron Microscopy (ETM) characterization show the formation of nanotubes
for the SrSnO3 samples and the cube morphology for the ZnSnO3 sample. The best
performance was presented by the sample of ZnSnO3 calcined at 600 ºC, after
hydrothermal treatment, presenting by XRD the formation of secondary phases, such as
the spinel and rutile structure.
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Materiais cerâmicos, Nanotecnologia, Estanatos, Coprecipitação, Microondas, Fotocatálise, Ceramic materials, Nanotechnology, Estanatos, Coprecipitation, Microwave, Photocatalysis
Citação
OLIVEIRA, N. L. Síntese e caracterização de SrSnO3 e ZnSnO3 obtidos pelo método de coprecipitação sem e com tratamento hidrotérmico assistido por micro-ondas. 2018. 100 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2018.