Síntese e caracterização de óxido semicondutor a base de estanatos pelo método precursor polimérico
Data
2015-04-17
Autores
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Editor
Universidade Federal de Goiás
Resumo
In this work, the Praseodymium Stannate system was successfully synthesized by
Polymeric Precursor Method. The crystallization temperature was evaluated by ATD
and after calcination the material was characterized by XRD, spectroscopy in the
infrared regions, spectroscopy in the region of UV-visible, scanning electron
microscope(SEM) ,transmission electron microscope (TEM) equipped with an energy
dispersive X-ray spectrometer (EDS) and photoluminescent measures. In the interests of
possible applicability of semiconductor in catalysis were made trials in the discoloration
of the tartrazine. The precursor powders calcined at different temperatures (400 ° C
versus time (4, 8 and 12 hours) and 600, 800 and 1000 ° C for 4 hours) are single phase
according to a results of X-ray diffraction. The degree of crystallinity increased with the
temperature according to the results of the Crystallite Size and FWHM. The energy of
the "bandgap" were calculated from the reflectance curves in the UV and showed
obtaining a Semiconductor (~ 2.0 eV). By TEM was observed nanoscale particles
monophasic with no secondary phase. The structure and morphology assessed by SEM
showed an agglomerate and porous material. The optical property showed a possible
applicability of the studied material as photoluminescent. According to the value of the
"forbidden band" and the porosity of the materials, photocatalytic tests were carried out
on discoloration of the dye tartrazine. The results showed that the studied material is
promising for catalysis.
Descrição
Palavras-chave
Pirocloro, Precursor polimérico, Catálise, Fotoluminescência, Pyrochlore, Polymeric precursor, Photoluminescence, Catalysis
Citação
BEZERRA, M. M. M. Síntese e caracterização de óxido semicondutor a base de estanatos pelo método precursor polimérico. 2015. 54 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2015.