Synthesis of Faujasite from Egyptian Clays: Characterizations and Removal of Heavy MetalsReportar como inadecuado




Synthesis of Faujasite from Egyptian Clays: Characterizations and Removal of Heavy Metals - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Three clay samples withdifferent mineral compositions kaolinite, smectite-kaoline, and smectite-richwere used for zeolite synthesis using the method of hydrothermal reactionsafter fusion with NaOH. The conditions of hydrothermal crystallizationzeolitization were found to be at temperature of 100°C, and time span between72 h and 96 h for kaoline and smectite-rich samples, while 48 h for the smectite-kaolinitesample. The results indicate that zeolites began to crystallize from claysamples after 48 h, and crystallization increased with increasing time. Thesynthetic materials have been characterized by X-ray diffraction XRD,scanning electron microscope SEM, fourier transform infrared spectroscopyFT-IR and thermogravimetric DTA-TGA analysis. The results indicate that lowsilica NaX-faujasite type with well-developed octahedral and cubic crystals wassynthesized from the three samples. No big difference in the characterizationbetween the three synthetic materials was detected, but smectite-kaolinitesample as raw material was relatively better in crystallization of syntheticzeolite. Applications of the synthetic materials in the removal of heavy metalsproved that the synthetic faujasite has strong effect for removing of Cr3+,Co2+, Ni2+ andMn2+ from aqueoussolution.

KEYWORDS

Faujasite, Kaoline, Smectite, Hydrothermal Reactions, Zeolite, Clay

Cite this paper

Moneim, M. and Ahmed, E. 2015 Synthesis of Faujasite from Egyptian Clays: Characterizations and Removal of Heavy Metals. Geomaterials, 5, 68-76. doi: 10.4236-gm.2015.52007.





Autor: Mohamed A. Moneim, Ezzat A. Ahmed

Fuente: http://www.scirp.org/



DESCARGAR PDF




Documentos relacionados