Síntese e caracterização de argilas pilarizadas com diferentes tipos de agentes pilarizantes
In this work, a study was conducted on the pillaring agents used in the pillaring process of bentonite clays, through a comparative study between 2 different samples: commercial clay (BENT) and natural clay (FCN), submitted to two types of agents. Pillarizing: Al13 and Al30 - this one only for BENT...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/52188 |
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| Resumo: | In this work, a study was conducted on the pillaring agents used in the pillaring process of bentonite clays, through a comparative study between 2 different samples: commercial clay (BENT) and natural clay (FCN), submitted to two types of agents. Pillarizing: Al13 and Al30 - this one only for BENT clay. Through analytical methods, the behavior of each pillaring agent in the clays of interest was determined according to the procedure performed. In the X-ray diffractometry (XRD), the insertion of the Keggin ion, a pillaring agent, inside the lamellae, was noticeable due to a shift to the left in the peak referring to the d001 plane, indicating an increase in the size of the interlamellar space. From this, it was noted that the interlamellar space of the FCN clay intercalated with Al30 obtained the most satisfactory results, with an interlamellar space of ~ 1.91 nm, to the detriment of the commercial BENT clay intercalated with Al13, with an interlamellar space of 1.82 nm. In the chemical analysis obtained through X-ray Fluorescence, there was an increase in the percentage of aluminum in all samples, indicating that there was insertion of the Keggin ion in the structure, corroborating the result of the XRD. The textural analysis by N2 adsorption informs that the natural FCN sample has a greater microporosity than the commercial bentonite sample. The area growth of the BENT-NAT samples for the PILC-BENT-13 sample was 8x, whereas for the FCN-NAT sample for the PILC-FCN-13 sample the increase was 1.6x. In the thermogravimetric analysis, due to the thermal stability of the materials, the pillarization provided an increase in stability since the mass loss at temperatures around 600°C was lower. The infrared spectroscopy analysis corroborated the analysis performed, showing that the chemical bonds of the structure of interest were present. It was concluded that it was possible to obtain pillared clays with Al13 and Al30 pillars providing materials with different properties. |
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