Síntese e caracterização de nanocompósitos a base de Fe3O4 e ZnO e estudo fotocatalítico para degradação de compostos orgânicos
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Data
2021-03-09
Autores
Silveira, Maria Laura Della Costa
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Universidade Estadual Paulista (Unesp)
Resumo
A contaminação do meio ambiente por elementos tóxicos, devido à crescente ação antrópica, afeta diretamente o equilíbrio ambiental. A concentração excessiva de compostos orgânicos, especialmente os corantes e fármacos, são um dos graves problemas que afetam esse equilíbrio. O uso de Fe3O4, como adsorventes vem aumentando, e esforços são necessários para a melhoria das propriedades, funcionalizações e aplicações destes adsorventes. Sendo assim, este trabalho visa estudar a síntese e caracterização de nanopartículas magnéticas de Fe3O4, ZnO, Fe3O4-ZnO e ZnO-Fe3O4. A junção de dois óxidos diferentes faz com que propriedades, anteriormente observadas individualmente, sejam alteradas, principalmente as propriedades eletrônicas e estruturais. Para a caracterização destes materiais, foram empregadas as seguintes técnicas: Microscopia eletrônica de varredura (MEV), espectroscopia na região do infravermelho com transformada de Fourier (FTIR) e na região do UV/Vis, potencial zeta (PZ). Os resultados indicaram que a síntese dos materiais propostos neste trabalho fora obtida de maneira eficiente, os quais foram discutidos e comparados com os encontrados na literatura referente a síntese de Fe3O4, ZnO e Fe3O4-ZnO. Com a obtenção das nanopartículas, as mesmas foram submetidas ao processo de fotodegradação do corante Rodamina B para avaliação da eficiência do material frente ao processo, nos quais os materiais ZnO e nanocompósitos Fe3O4-ZnO, sendo posteriormente comparados com resultados encontrados na literatura, revelaram-se como ótimos catalisadores, com taxas de degradação que variaram de 15 a ~100%.
The contamination of the environment by toxic elements, for the crescente anthropic action, affect directly the ambiental equilibrium. The excessive concentration of organics compounds, especially drugs and dyes, is one of the serious problems that affect such an equilibrium. The use of Fe3O4, as adsorbents, has been increasing, and activities are being done to improve the properties, functionalizations, and applications of these adsorbents. This work aims to study the synthesis and characterization of magnetic nanoparticles Fe3O4, ZnO, Fe3O4-ZnO and ZnO-Fe3O4. The union of two different oxides makes the proprieties showed before are changed, mainly the proprieties electronics and structural. For the characterization of materials were performed the following techniques: Scanning electron microscope (SEM), Fourier-Transform Infrared spectroscopy (FTIR), and UV/Vis, zeta potential (PZ). The results indicated that the synthesis of the materials proposed in the work had been obtained efficiently, discussed, and compared with the literature referred to synthesis Fe3O4, ZnO e Fe3O4-ZnO. With the obtaining of the nanoparticles, as they were submitted to the process photodegradation of the dye Rhodamine B, to evaluate the efficiency material in process, ZnO e nanocomposites Fe3O4-ZnO, showed to be excelente catalysts with degradation rates that varied from de 15 a ~100%
The contamination of the environment by toxic elements, for the crescente anthropic action, affect directly the ambiental equilibrium. The excessive concentration of organics compounds, especially drugs and dyes, is one of the serious problems that affect such an equilibrium. The use of Fe3O4, as adsorbents, has been increasing, and activities are being done to improve the properties, functionalizations, and applications of these adsorbents. This work aims to study the synthesis and characterization of magnetic nanoparticles Fe3O4, ZnO, Fe3O4-ZnO and ZnO-Fe3O4. The union of two different oxides makes the proprieties showed before are changed, mainly the proprieties electronics and structural. For the characterization of materials were performed the following techniques: Scanning electron microscope (SEM), Fourier-Transform Infrared spectroscopy (FTIR), and UV/Vis, zeta potential (PZ). The results indicated that the synthesis of the materials proposed in the work had been obtained efficiently, discussed, and compared with the literature referred to synthesis Fe3O4, ZnO e Fe3O4-ZnO. With the obtaining of the nanoparticles, as they were submitted to the process photodegradation of the dye Rhodamine B, to evaluate the efficiency material in process, ZnO e nanocomposites Fe3O4-ZnO, showed to be excelente catalysts with degradation rates that varied from de 15 a ~100%
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Palavras-chave
Nanopartículas magnéticas, Magnetita, Óxido de zinco, Superfície, Fotodegradação, Magnetic nanoparticles, Magnetite, Oxide zinc, Surface, Photodegradation