Kinetics and Ecotoxicology of Arsenic Adsorption Using Zeolite 4A
Study of Arsenic Removal from Aqueous Solutions Using Zeolite 4A Synthesised from Kaolin
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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 ze...
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.
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