Influência do método de obtenção de heteroestruturas de Bi2MoO6:ZnO para aplicação fotocatalítica
Due to the high consumption and inappropriate disposal of industrial products, from clothing to food products, society's interest in developing materials that have catalytic properties that use means for the degradation of these organic contaminants, which can be dyes, active ingredient of d...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/52280 |
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| Resumo: | Due to the high consumption and inappropriate disposal of industrial products, from
clothing to food products, society's interest in developing materials that have catalytic
properties that use means for the degradation of these organic contaminants, which
can be dyes, active ingredient of drugs and among others has been increasing. The
degradation reaction is accelerated using electromagnetic radiation, potential
difference or ultrasonic radiation. In this work, the microwave-assisted hydrothermal
method was used simultaneously with the sonochemical method (route 1) and only
the sonochemical method (route 2) to obtain Bi2MoO6/ZnO heterostructures, with
mass ratios of 1:1, 1 :2, 1:4, 1:8, 2:1, 4:1 and 8:1. The particles obtained were
characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission
scanning electron microscopy (SEM-FEG) and spectroscopy in the ultraviolet visible
region (UV-Vis). To evaluate the photocatalytic properties, photodegradation tests
were performed against methylene blue and rhodamine B dyes using UV and solar
radiation. The XRD results indicated the presence of ZnO phases with hexagonal
structure and Bi2MoO6 with orthorhombic phase. The formation of a secondary
phase of bismuth molybdate (Bi4MoO9) in route 1 was observed. Raman
spectroscopy revealed the standard vibrational modes of the phases obtained from
Bi2MoO6/ZnO, and also confirmed the presence of the secondary phase. The images
obtained by SEM-FEG showed an irregular and predominant morphology in route 1
of synthesis, typical of the secondary phase of molybdate, and in route 2 of
synthesis, platelet-like morphology was obtained for molybdate and rods and flowers
for zinc oxide. The heterostructures with a 1:1 ratio showed absorption for longer
wavelengths and smaller bandgap, indicating a probable photoactivity under solar
radiation and degradation of organic compounds, such as methylene blue and
rhodamine B dyes. The reuse cycles indicated a high potential for application
practice in wastewater, due to the capacity of consecutive cycles for
photodegradation, even with the reduction of photocatalytic efficiency. |
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