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This study proposed the use of kaolin from Juazeirinho, in the state of Paraíba, as a source of aluminium and silicon for the production of zeolite 4A from a hydrothermal reaction, where the synthesis procedure consisted of the thermal activation of the kaolin, which was subjected in a mulfla to a temperature of 850°C for 2 hours to become metakaolin; 3g of this metakaolin obtained was added to a Teflon/aluminium container along with 30mL of a 1.25 mols/L NaOH solution, and this system was placed in an oven at 150°C for 4 hours at autogenous pressure for the hydrothermal reaction to form zeolite 4A. The resulting material was centrifuged and washed with deionised water to a pH close to 7.0, and then dried in an oven at 100°C for approximately 15 hours. The XRD results showed that the kaolin from Juazeirinho consists mainly of kaolinite. The data from the removal tests determined by ICP-OES suggest that zeolite 4A has good adsorption capacity. The results showed that the Langmuir model is more appropriate than the Freundlich model for fitting the experimental data.
About the author
Livre basé sur ma thèse de doctorat en génie chimique. Je remercie sincèrement mon directeur de thèse, le professeur Agenor Furigo Junior, ainsi que mes co-directeurs de thèse, le professeur Humberto Gracher Riella et le professeur Gilmar Sidney Erzinger, sans qui ce travail n'aurait pas été possible.
