Síntese de óxido de silício a partir do bagaço da cana-de-açúcar modificado com óxido de ferro magnético: aplicação em fotodegradação do corante amarelo de tartrazina
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Data
2021-06-30
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Universidade Federal de Goiás
Resumo
The development of technologies that can reuse this biomass for the benefit of the environment
becomes an inherently necessary strategy. Within this context, this work used sugarcane bagasse
for the production of silica. This silica was modified with magnetite nanoparticles (since it can be
magnetically recoverable, preventing the effluent from having more residue) to be applied as
photocatalysts for the degradation reaction of tartrazine yellow dye used as model dye.
Morphologically, SiO2 was show porous and has a predominantly quartz structure.
Spectroscopically, silica was confirmed due to the absence of vibrational modes of organic
chromophores. From the synthesis of magnetic nanoparticles through the co-precipitation method
in the presence of silica, a core-shell system (SiO2@Fe3O4) was obtained, which was confirmed by
X-ray Diffraction and Scanning Electron Microscopy. The low value calculated for the band gap
energy for SiO2@Fe3O4, by the Tauc method, indicated a facilitation in the photodegradation of the
dye due to the presence of a heterojunction of the SiO2@Fe3O4 system. Finally, the degradation
efficiency of tartrazine yellow dye was more than double when compared to the action only of
silica.
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Palavras-chave
Sílica, Nanomagnetita, Tartrazina, Heterojunção, Fotodegradação, Silica, Nanomagnetite, Tartrazine, Heterojunction, Photodegradation
Citação
TATENO, N. S. Síntese de óxido de silício a partir do bagaço da cana-de-açúcar modificado com óxido de ferro magnético: aplicação em fotodegradação do corante amarelo de tartrazina. 2021. 75 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Catalão, 2021.