Synthesis of Faujasite from Egyptian Clays: Characterizations and Removal of Heavy Metals

Abstract

Three clay samples with different mineral compositions (kaolinite, smectite-kaoline, and smectite-rich) were used for zeolite synthesis using the method of hydrothermal reactions after fusion with NaOH. The conditions of hydrothermal crystallization (zeolitization) were found to be at temperature of 100˚C, and time span between 72 h and 96 h for kaoline and smectite-rich samples, while 48 h for the smectite-kaolinite sample. The results indicate that zeolites began to crystallize from clay samples after 48 h, and crystallization increased with increasing time. The synthetic materials have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), fourier transform infrared spectroscopy (FT-IR) and thermogravimetric (DTA/TGA) analysis. The results indicate that low silica NaX-faujasite type with well-developed octahedral and cubic crystals was synthesized from the three samples. No big difference in the characterization between the three synthetic materials was detected, but smectite-kaolinite sample as raw material was relatively better in crystallization of synthetic zeolite. Applications of the synthetic materials in the removal of heavy metals proved that the synthetic faujasite has strong effect for removing of Cr 3+ , Co 2+ , Ni 2+ and Mn 2+ from aqueous solution.

A Comparative Study on the Synthesis of Type <i>NaX </i>Zeolite Prepared from Kaolin for Builder Application in Detergent Production

“…The patterns for the zeolite produced from both kaolinites are similar with one another and with the patterns reported by Moneim and Ahmed, and Wang et al, [18,29]. Both samples show Bragg angles correlated to the formation of zeolite type X as seen in 38-237-ICDD [30] and confirmed by the Structural Commission of the International Zeolite Association [31].…”

“…However, it could be seen from the diffraction patterns that quartz, treated as an impurity, still exists. Recent studies have reported the stability of quartz during hydrothermal synthesis [18,29].…”

Organic Depollution on Mixed Matrix Membranes Containing a Zeolithe of Faujasite Y Type of Synthesis as a Microporous Charge

“…Al molar ratio is 2.99 and the Al / Na molar ratio is 0.59. This analysis is consistent with a Y-type faujasite(Mohamed and Ezzat, 2015;Wolfgang …”

Removal of methylene blue from textile waste water using kaolin and zeolite-x synthesized from Ethiopian kaolin

“…Asymmetric and symmetric Si-O-Si stretching vibrations due to silica were present at 1034 cm −1 and 809 cm −1 , respectively [ 31 ]. The IR-spectral data of the synthesized zeolite double ring opening vibration 563 cm −1 in the FT-IR spectrum of the synthesized zeolite is near to 566 cm −1 , which is a characteristic to faujasite [ 32 ]. The existence of functional groups Si, Al, and O observed in the spectrum, it was concluded that the formation of Zeolite framework was confirmed by FT-IR.…”