Síntese, Caracterização e Aplicação de Manganês Suportado em Material do tipo MCM

Abstract

In this work mesoporous materials containing manganese in its structure were synthesized and characterized. For incorporation of the metal were made two different methods, one with the metal addition during synthesis of the silicate support and another after the synthesis. The samples were subjected to the tests of adsorption of methylene blue cationic organic dye (AM). All synthesized catalysts were characterized by Flame Atomic Absorption Spectroscopy (FAAS), X-ray diffraction (XRD), infrared spectroscopy coupled to the attenuated total reflectance accessory (FTIR-ATR) scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), N2 physisorption, temperature programmed reduction (TPR), thermogravimetric analysis and zeta potential. According to the results, the addition of manganese by different synthetic routes allowed the synthesis of materials based on metal oxides incorporated into silica. It is observed that the addition of manganese during synthesis increased the specific surface area of the sample, and that the incorporation after synthesis did not show significant amounts of metal. The synthesized samples showed pore diameter in micro and mesoporous scale. Adsorption tests of methylene blue dye were realized in UV-vis and showed that the silicate materials containing manganese are effective in adsorption of methylene blue, obtaining an efficiency greater than 80% in the elimination of the dye.