Síntese de Zeólita A sem geração de resíduos: avaliação dos parâmetros reacionais para uma rota Eco-Friendly
There is a huge consumption of synthetic zeolites in the world and zeolite A has been the most used due to its versatility, being used as adsorbent, detergent additive, animal feed and agriculture. However, its route of hydrothermal synthesis does not meet the criteria of sustainability and reductio...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/33301 |
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| Resumo: | There is a huge consumption of synthetic zeolites in the world and zeolite A has been
the most used due to its versatility, being used as adsorbent, detergent additive,
animal feed and agriculture. However, its route of hydrothermal synthesis does not
meet the criteria of sustainability and reduction of residues. Thus, type A zeolite
samples were synthesized from an experimental design, aiming to optimize the
synthesis process and to evaluate the effect of crystallization time and NaOH/SiO2
and H2O/SiO2 ratios. Additionally, the reuse of separated alkaline mother liquor
during filtration was also studied. Significant amount of mother liquor waste is
generated in the preparation of zeolitic materials. Recycling is proposed as the best
solution for handling such chemical wastes. As a result, it was possible to optimize
the synthesis process to obtain crystals of zeolite A, with adequate morphology and
crystallinity, in 79 minutes and with a 50% reduction of water and sodium hydroxide
content in the synthesis gel. Zeolite A crystals with high crystallinity could also be
obtained within 60 min at 100 °C by reusing the mother liquor. The materials were
characterized by powder X-ray diffraction and scanning electron microscopy. |
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