Estudo de adsorção e fotodegradação da rodamina b com nanopartículas core-shell de zro2@sio2 preparadas pelo método sol-gel
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Data
2018-09-28
Autores
Padovini, David Santos Souza
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Universidade Estadual Paulista (Unesp)
Resumo
Com o crescimento das aplicações dos nanomateriais, as metodologias de síntese têm se tornado importante para pesquisadores e investidores nesse ramo da ciência. A metodologia hidrotérmica permite a síntese de nanopartículas de ZrO2 com uma estrutura estável e morfologia bem definidas, e tamanhos que chegam na ordem de 5 nm. Essa estrutura nanopartículada combinada com o SiO2 tem a capacidade de sofrer transformações nas sua configuração eletrônica, o que permite, uma redução do Band gap. Essa propriedade é extremamente importante para aplicação em fotodegradação. Os resultados das caracterizações mostraram que a rota de síntese utilizada foi eficiente na produção de nanoestruturas cristalinas de ZrO2 e a metodologia para obter o Core-Shell foi eficiente para a formação da heteroestrutura. As análises de FT-IR e TG mostraram que restou apenas uma pequena quantidade de material residual na superfície dos materiais após o tratamento térmico, demostrando que a técnica hidrotermal mostrou-se eficiente tanto na cristalização e crescimento do ZrO2 como na eliminação do material orgânico proveniente da síntese e o método sol-gel usado para obter Core-Shell também proporciona uma quantidade de resíduos sobre a superfície do material. Os estudos de adsorção revelaram que o comportamento do SiO2 e do ZrO2 na adsorção do corante Rodamina B funcionam de formas distintas e a união dos óxidos proporciona o aparecimento de novas características importantes para o processo adsortivo. Os resultados de Band Gap e fotodegradação revelaram o efeito sinérgico que ocorre no Core-Shell, há uma redução do Band Gap e o material passa apresentar atividade fotocatalítica .
With the growth of nanomaterials applications, synthesis methodologies have become important for researchers and investors in this field of science. The hydrothermal methodology allows the synthesis of ZrO2 nanoparticles with a well-defined stable structure and morphology, and sizes ranging in the order of 5 nm. This nanoparticle structure combined with SiO2 has the capacity to undergo transformations in its electronic configuration, which allows a reduction of Band Gap. This property is extremely important for the photodegradation application. The results of the characterizations showed that the synthesis route used was efficient in the production of crystalline ZrO2 nanostructures and the methodology to obtain Core-Shell was efficient for the heterostructure formation. The analysis of FT-IR and TG showed that there is a small amount of residual material on the surface of the materials after the heat treatment, demonstrating that the hydrothermal technique proved to be efficient both in the crystallization and growth of ZrO2 how the elimination of the organic material from the synthesis and the sol-gel method used to obtain Core-Shell also provides a quantity of residues on the surface of the material. The adsorption studies showed that the behavior of SiO2 and ZrO2 in the adsorption of Dye Rhodamine B works in different ways and the union of the oxides gives rise to new important characteristics for the adsorption process. The results of Band Gap and photodegradation revealed the synergistic effect that occurs in the Core-Shell, there is a reduction of Band Gap and the material pass present photocatalytic activity
With the growth of nanomaterials applications, synthesis methodologies have become important for researchers and investors in this field of science. The hydrothermal methodology allows the synthesis of ZrO2 nanoparticles with a well-defined stable structure and morphology, and sizes ranging in the order of 5 nm. This nanoparticle structure combined with SiO2 has the capacity to undergo transformations in its electronic configuration, which allows a reduction of Band Gap. This property is extremely important for the photodegradation application. The results of the characterizations showed that the synthesis route used was efficient in the production of crystalline ZrO2 nanostructures and the methodology to obtain Core-Shell was efficient for the heterostructure formation. The analysis of FT-IR and TG showed that there is a small amount of residual material on the surface of the materials after the heat treatment, demonstrating that the hydrothermal technique proved to be efficient both in the crystallization and growth of ZrO2 how the elimination of the organic material from the synthesis and the sol-gel method used to obtain Core-Shell also provides a quantity of residues on the surface of the material. The adsorption studies showed that the behavior of SiO2 and ZrO2 in the adsorption of Dye Rhodamine B works in different ways and the union of the oxides gives rise to new important characteristics for the adsorption process. The results of Band Gap and photodegradation revealed the synergistic effect that occurs in the Core-Shell, there is a reduction of Band Gap and the material pass present photocatalytic activity
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Dióxido de zircônio, Dióxido de silício, Síntese hidrotérmica, Nanocomposito, Adsorção, Nanopartícula, Fotodegradação, Zirconium dioxide, Silicon dioxide, Hydrothermal synthesis, Core-shell, Adsorption, Nanoparticles, Photodegradation