Síntese e caracterização de heteroestruturas de Ag2MoO4 e ZnO e investigação da sinergia nas propriedades fotocatalíticas e fotoluminescentes
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Data
2017-04-07
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Universidade Federal de Goiás
Resumo
Nanostructured materials, such as: Ag2MoO4 and ZnO are of great importance because
they have unique characteristics and properties, and can be applied in sensors, catalysis,
photoluminescence, among other applications. In this work, the Ag2MoO4 and ZnO
powders were synthesized separately and in the form of heterostructures, by two different
routes, coprecipitation (CP), at room temperature and coprecipitation with subsequent
microwave assisted hydrothermal treatment (CPMAHT), at 130 ° C for 30 min, with a
heating rate of 10 ° C / min. The heterostructures composed of both materials, Ag2MoO4
and ZnO present in molar proportions ranging from 0.25-2.00%, were synthesized by
coprecipitation with subsequent sonochemical processing (CPSP). The Ag2MoO4
samples were obtained with pure cubic phase of spinel type with crystallite size of 143
nm for the sample obtained by CP and 90 nm for the sample obtained by CPTHAM. For
the ZnO the hexagonal phase of the wurtzite type, with crystallite sizes of 19 and 49 nm,
was obtained for the samples obtained by CP and CPTHAM, respectively. The phases of
both Ag2MoO4 and ZnO were observed for the heterostructures obtained by CPSP. The
structural and morphological characterization of the obtained materials was performed
using X-ray diffraction (XRD) techniques and scanning electron microscopy (SEM). The
diffusion reflectance UV-Vis spectroscopy (DRS) was performed to determine the band
gap values of the materials. The photoluminescent property was investigated by means of
the photoluminescence spectroscopy (PHS) technique, with an improvement in the
photoluminescent property of broadband for all the obtained heterostructures. It was also
observed that the synergism of the Ag2MoO4 and ZnO materials in the heterostructures
resulted in an improvement in the photocatalytic property, leading to a 90% discoloration
of the rhodamine B dye in 90 min for the photocatalysis using the Ag2MoO4: 2 ZnO
heterostructure.
Descrição
Palavras-chave
Molibdato de prata, Óxido de zinco, Heteroestruturas, Síntese sonoquímica, Método hidrotérmico, Fotoluminescência, Silver molybdate, Zinc oxide, Heterostructures, Sonochemistry synthesis, Hydrothermal method, Photoluminescence
Citação
SILVA, D. C. S. Síntese e caracterização de heteroestruturas de Ag2MoO4 e ZnO e investigação da sinergia nas propriedades fotocatalíticas e fotoluminescentes. 2017. 76 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2017.