Navegando por Autor "Bezerra, Marta Maria de Moura"

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    Síntese e caracterização de óxido semicondutor a base de estanatos pelo método precursor polimérico
    (Universidade Federal de Goiás, 2015-04-17) Bezerra, Marta Maria de Moura; Santos, Maria Rita de Cássia; http://lattes.cnpq.br/2598029192393541; Santos, Maria Rita de Cássia; Machado, Antônio Eduardo da Hora; Andrade, Leonardo Santos
    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.