Synthesis and Characterization of Mesoporous Materials SBA-15 Obtained with Different Synthesis Conditions

Abstract

The mesoporous materials has received much attention due to their promising features in catalysis area, adsorption and ion exchange. Among these materials highlights the SBA-15 having a hexagonal structure, unidirectional, high thermal and hydrothermal stability and high average pore diameter. The synthesis of this material occurs in acidic medium using as organic P123 driver and TEOS as silica source. Despite using only an organic driver, other materials based on silica, such as KIT-6 using an alcohol such as codirecionador structure, reducing the aging time to 24 hours compared to SBA-15. This paper aims to synthesize the SBA-15 using Butanol (C 4 H 10 O) in the synthesis process in order to obtain a material in a shorter time and characterize it in order to evaluate the use of butanol synthesis through the materials obtained. Samples were synthesized according to Zhao et al. (1998) and using the modifications Butanol and characterized by XRD, TG / DTG, adsorption / desorption of nitrogen and SEM. The butanol synthesized material showed textural, structural and morphological characteristics similar to the standard sample, typical materials of SBA-15 type, even with a reduction of 24 hours of its synthesis. The materials synthesized with the use of alcohol, had thicker walls which gives the material a greater resistance. It was possible to shorten the synthesis of SBA-15 in 24 hours, yielding high quality materials, using Butanol during its synthesis.

Al/SBA-15 Mesoporous Material: A Study of pH Influence over Aluminum Insertion into the Framework

“…The micrographs reveal materials with a morphology of particles in the form of well-organized stems, united among themselves, similar to a beaded necklace. Such morphology is characteristic of the structure of SBA-15, according to the literature [ 35 ]. This morphological observation corroborates with the low-angle XRD patterns and certifies that the synthesis method employed and the Al insertion did not modify the typical morphology of the SBA-15 materials.…”

“…These results are in agreement with the 27 Al MAS NMR measurements, where the samples with a higher amount of Al atoms with octahedral coordination, which are Figure 4 shows the N 2 adsorption-desorption isotherms of all materials and their pore size distributions using the VBS method [26], for the materials obtained. All of the isotherms (Figure 4A,B) were classified as Type IV(a) isotherms, characteristic of mesoporous materials with capillary condensation between 0.6 and 0.8 p/p 0 with a final plateau [25,35]. In the case of SBA-15 materials, their isotherms present a Type H1 hysteresis loop, whereas for the materials with Al insertion, mainly for those synthesized with a pH of 2.0 and also with a high Si/Al molar ratio (or less Al insertion), the profile of the hysteresis loop changes to Type H5.…”

Influence of Synthesis Parameters in Obtaining KIT-6 Mesoporous Material

“…It can be observed that the standard KIT-6 showed three well-defined mass losses. The first loss corresponds to the removal of physisorbed water in the interior of the materials; the second loss is related to the degradation of the organic template and the removal of chemisorbed water; the third loss corresponds to the condensation of the remaining silanol groups in the surface and in the pores of the materials [33,34]. In general, the other samples showed similar losses, with some cases of specific changes in the temperature intervals of the mass losses and the quantity of losses being also observed.…”

Desenvolvimento de fase monolítica com grupos amino e nano partículas para a determinação de carbidopa, levodopa, benserazida, dopamina e 3-O-metildopa em amostras de plasma de pacientes com a doença de Parkinson por HILIC-MS/MS no modo column switching

“…O SBA-15, material mesoporoso à base de sílica, possui estrutura hexagonal bidimensional, poros ordenados, área superficial elevada, diâmetro e volume médio de poros elevados e grande estabilidade mecânica e hidrotérmica (ZHAO et al, 1998b(ZHAO et al, , 1998cBUI et al, 2013;JIN et al, 2013;D. FERNANDES et al, 2016).…”