Synthesis of nanocrystalline zeolite Na-A from coal fly ash and different aluminum sources
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2018
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Coal Fly Ash
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This chapter describes the synthesis process to obtain zeolite Na-A
from coal fly ash via fusion with NaOH followed by hydrothermal
reaction. Coal fly ash is a low cost source of both silica and alumina. The
molar ratio of SiO2/Al2O3 for zeolite 4A formation was achieved by the
addition of sodium aluminate solution or aluminum waste from tertiary industry as aluminum sources. The effects of temperature and time at the
fusion step and the hydrothermal reaction time on crystalline products
were investigated. The synthesized products were studied for their purity
and yield as well as were characterized by different techniques such as Xray
powder diffraction (XRD), scanning electron microscopy (SEM) and
cation exchange capacity (CEC), among others. Analysis of the properties
of the raw materials and the products demonstrates that the by-products
can be used to produce a high purity zeolite A. The optimum conditions
related to the synthesis was set and the samples were pure, highly
crystalline and white. The synthesized zeolites were used for both the
removal of Cd (II) and Zn (II) from aqueous solution. The results showed
that coal fly ash and aluminum source can be transformed into zeolite A,
which is considered as value-added material with adsorption properties.
Como referenciar
FUNGARO, DENISE A.; IZIDORO, JULIANA C.; GUILHEN, SABINE N.; SILVA, KATIA C.; WANG, SHAOBIN. Synthesis of nanocrystalline zeolite Na-A from coal fly ash and different aluminum sources: application for heavy metals removal. In: GRAY, MIRIAM (ed.). Coal Fly Ash. Hauppauge, NY, USA: Nova Science Publishers, 2018. , cap. 4. p. 1-33. Disponível em: http://repositorio.ipen.br/handle/123456789/30087. Acesso em: 18 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.