Elaboration and Characterization of New Adsorbent Using Oil Shale Ash for Dyes Removal from Aqueous Solutions

Abstract

The aim of this work was the elaboration and characterization of a zeolite (OSZ) in an alkaline medium from the oil shale ash for the removal of the two dyes Crystal Violet (CV) and Red Congo (RC) in aqueous milieu. The adsorbent material quality (OSZ) prepared was studied by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) coupled by EDX, Fourier transform infrared spectroscopy (FTIR) and fluorescence of X-rays spectroscopy (FRX). In addition, the adsorption in batch system of the two dyes CV and RC on the OSZ material was studied. Therefore, we accomplished a parametric study of the adsorption by studying the effect of several important parameters on the decolorizing power of the used material, namely, the contact time, the adsorbent dose, the pH solution and the temperature. The decolorization percentage was 97 and 81% for CV and RC dye respectively. Kinetic studies of dyes carried out the pseudo-second order at different dye concentration values. The Langmuir model describes satisfactory adsorption on the OSZ. Thermodynamic studies indicated that dye adsorption process by OSZ was spontaneous, physisorption and endothermic in nature.