Síntese e caracterização da heterojunção SrMoO4/g-C3N4 preparada via tratamento hidrotérmico: um estudo das propriedades ópticas e fotocatalíticas
The inappropriate dumping of organic effluents in aquatic ecosystems has raised the need for new technologies for residual water treatment, capable of definitively reducing the concentration of these compounds in the environment. In this scenario, Advanced Oxidative Processes based on semiconduct...
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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/123456789/51370 |
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| Resumo: | The inappropriate dumping of organic effluents in aquatic ecosystems has raised the
need for new technologies for residual water treatment, capable of definitively
reducing the concentration of these compounds in the environment. In this scenario,
Advanced Oxidative Processes based on semiconductor photocatalysts, such as
strontium molybdate (SrMoO4), emerges as an appropriate alternative to promote the
degradation of organic pollutants into non-toxic substances. However, SrMoO4 in its
pure phase normally has unfavorable photocatalytic properties. A potentially effective
strategy to overcome such limitations is the construction of a heterostrtured
photocatalyst with the polymeric semiconductor g-C3N4. Thus, SrMoO4 particles and
SrMoO4/xg-C3N4 heterostructures were synthesized via a co-precipitation route with
additional hydrothermal treatment for different heating times at a fixed temperature of
140 °C. In order to evaluate the influence different percentages of g-C3N4 the
SrMoO4 structure and the synergistic effect resulting from the interface interaction
between both, the powders were structurally characterized by X-ray diffraction and
Raman spectroscopy, in which it was possible to verify the obtaining of the pure
phase of SrMoO4 and the composite phase of SrMoO4/xg-C3N4. Optical analysis by
ultraviolet visible spectroscopy revealed that g-C3N4 can considerably decrease the
SrMoO4 gap, while the heterojunction mechanism estimated for SrMoO4/g-C3N4
suggests an increase in the lifetime of photogenereated loads. Such characteristics
indicate the possibility of obtaining a material with improved photocatalytic properties,
which were later verified through photocatalytic tests of methylene blue under UV
and solar light, with results above 74 and 97%, respectively. In addition, the
heterojunctions showed excellent absorption capacity in the middle of the cationic dye system. |
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