Síntese da Zeólita Silicoaluminofosfato (SAPO-11) empregando resíduo de lâmpadas fluorescentes
The fluorescent lamp is material widely used in society. After consumption, inappropriate disposal causes great environmental impacts as it is a material that contains heavy metals, such as mercury. The fluorescent lamp residue (phosphoric powder), after the lamp crushing process, the substances...
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| Format: | Dissertação |
| Langue: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Accès en ligne: | https://repositorio.ufrn.br/handle/123456789/47531 |
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| Résumé: | The fluorescent lamp is material widely used in society. After consumption, inappropriate
disposal causes great environmental impacts as it is a material that contains heavy metals,
such as mercury. The fluorescent lamp residue (phosphoric powder), after the lamp crushing
process, the substances are separated by categories such as: glass, gases, insulation Bakelite
and phosphoric powder. This phosphoric powder goes through a distillation process to
recover the mercury, leaving the solid residue. In order to use and manage the phosphoric
residue, this material was used as an alternative source in the synthesis process of zeolites,
which are materials composed by the union of Al and Si tetrahedrons, through the sharing of
oxygen atoms. The use of the studied residue, as its chemical composition 9,98% of silicon
oxide (source of Si), 8,9% of aluminum oxide (source of Al) and 27,7% of phosphorus oxide
(source of P), contributed to the synthesis of a material that has added value,
silicoaluminophosphate SAPO-11, AEL structure (Aluminophosphate Eleven), through the
hydrothermal process. The studied synthesis parameters were: the additional aluminum source
in the synthesis, neutral alumina or aluminum hydroxide, the amount of residue used in the
synthesis (2, 1 and 0,5 g) and the crystallization time (185 and 200 ºC), based on the molar
composition 1,2DPA:1,0Al2O3:1,0P2O5:0,3SiO2:120H2O. The synthesis results were
characterized by X-ray diffraction (XRD), X-ray fluorescence (FRX), fourier transform
infrared absorption spectroscopy (FTIR), scanning electron microscopy (SEM) and adsorption
analysis and nitrogen desorption. From the results obtained, and under the studied synthesis
conditions, the samples 24/SHR0.5, 48/SHR0.5 and 72/SHR0.5, synthesized with the addition
of 0.5 g of the residue, at a temperature of 200 ºC in medium static, additional aluminum
source aluminum hydroxide and crystallization time of 24 h, 48 h and 72 h, respectively, the
best result was obtained, with the formation of the SAPO-11 phases, using the phosphoric
residue from the fluorescent lamp. The research carried out in this work is an innovation in
the SAPO-11 synthesis process, adding value to the waste and transforming it into a new
material, and consequently influencing economically, sustainably and technological innovation. |
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