Síntese e caracterização de sílica mesoporosa MCM-41

Abstract

The growing interest in the development of multifunctional materials has mobilized many researchers due to their possible potential applications in several areas. Creating multimodal platforms, despite appearing simple, faces significant challenges in achieving effective performance. The incorporation of nanomaterials and functional groups can confer therapeutic, antibacterial and hydrophobic properties. Silica materials, especially mesoporous silica MCM-41, discovered in 1992, feature hexagonal rrangements of cylindrical pores, synthesized by self-assembly into surfactant micelles. The MCM-41 arrays have a uniform size of 15 to 100 Å and a surface area >1000 m².g-1, and an ordered pore system with a distribution between 2 and 10 nm in diameter. The main objective of this work is to synthesize, functionalize and characterize the amino-functionalized MCM-41 mesoporous silica through different methodologies, in order to obtain a material with great potential for adsorption. The synthesized amino functionalized MCM-41 presented a hexagonal structure with cylindrical pores, with uniform spherical nanoparticles. Analysis by Xray diffraction and transmission electron microscopy (TEM) confirmed the hexagonal ordering of the structure, while FTIR spectra showed the incorporation of surfactant micelles into the nanopores. Textural characterization revealed a high specific surface area (896.08 m2/g), with medium-sized pores (2.40 nm) and large pore volume (431.07 cm³/g) for the amino functionalized MCM-41 sample. . These results indicate that amino functionalized MCM-41 has a well-defined mesoporous structure, suitable for technological applications.