Navegando por Autor "Tateno, Nathalia Sayuri"

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    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
    (Universidade Federal de Goiás, 2021-06-30) Tateno, Nathalia Sayuri; Martins, Marccus Victor Almeida; https://orcid.org/0000-0001-8692-675X; http://lattes.cnpq.br/4449440198423893; Oliveira, Jocélia Pereira de Carvalho; https://orcid.org/0000-0003-0701-3480; http://lattes.cnpq.br/5885886578616571; Oliveira, Jocélia Pereira de Carvalho; Ramirez, Fabian Enrique Nima; Godinho Júnior, Mário
    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.