Nova rota para síntese de nanopartículas de óxido de magnésio, caracterização e aplicações.
Data
2022-12-20
Orientadores
Triboni, Eduardo Rezende 
Tipo
Dissertação de mestrado
Título da Revista
ISSN da Revista
Título de Volume
Resumo
O presente estudo refere-se à síntese de nanopartículas de óxido de magnésio (MgO). O MgO permite produzir materiais semicondutores, catalisadores, bactericidas, purificadores ambientais entre outras funções devido aos sítios defeituosos em sua estrutura cristalina e capacidade absorver componentes (moléculas e gases). A rota inédita sol/gel, glicerol/i-propanol, variação da rota glicerol/ureia foi usada para a preparação das nanopartículas de MgO. Nesse processo foram feitos testes quanto a variações dos sais do metal como precursores e de temperatura de calcinação (300 – 500 °C) para a parametrização da metodologia, destas sínteses foi possível adquirir nanopartículas de MgO em formato de flocos, folhas e fitas que possuem uma boa capacidade de adsorção de corantes. Para caracterização desses materiais foram usadas as técnicas de difração de raios X, microscopia eletrônica de transmissão, microscopia eletrônica de varredura, microscopia eletrônica de varredura-Field Emission Gun (FEG), infravermelho por transformada de Fourier, espectroscopia ultravioleta -visível e espalhamento dinâmico de luz.
The present study refers to the synthesis of magnesium oxide (MgO) nanoparticles. MgO allows the production of semiconductor materials, catalysts, bactericides, environmental purifiers, among other functions, due to defective sites in its crystalline structure and ability to absorb components (molecules and gases). The unpublished sol/gel, glycerol/i-propanol, variation of the glycerol/urea route was used for the preparation of MgO nanoparticles. In this process, tests were carried out regarding variations in metal salts as precursors and calcination temperature (300 – 500 °C) for parameterization of the methodology, from these syntheses it was possible to acquire MgO nanoparticles in the form of flakes, sheets and ribbons that good dye adsorption capacity. For the characterization of these materials, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, scanning electron microscopy-Field Emission Gun (FEG), Fourier transform infrared, ultraviolet-visible spectroscopy and dynamic scattering were used. light.
The present study refers to the synthesis of magnesium oxide (MgO) nanoparticles. MgO allows the production of semiconductor materials, catalysts, bactericides, environmental purifiers, among other functions, due to defective sites in its crystalline structure and ability to absorb components (molecules and gases). The unpublished sol/gel, glycerol/i-propanol, variation of the glycerol/urea route was used for the preparation of MgO nanoparticles. In this process, tests were carried out regarding variations in metal salts as precursors and calcination temperature (300 – 500 °C) for parameterization of the methodology, from these syntheses it was possible to acquire MgO nanoparticles in the form of flakes, sheets and ribbons that good dye adsorption capacity. For the characterization of these materials, X-ray diffraction, transmission electron microscopy, scanning electron microscopy, scanning electron microscopy-Field Emission Gun (FEG), Fourier transform infrared, ultraviolet-visible spectroscopy and dynamic scattering were used. light.