Green clay · Characterization · Hexavalent chromium · Adsorption · Fixed bed column · Modeling
Abstract :
[en] The removal of hazardous metal ions from polluted water is a crucial process aimed at enhancing water quality. In this
study, we conducted a dynamic adsorption investigation utilizing natural green clay for the removal of hexavalent chromium from aqueous solutions. The material underwent characterization through various techniques, including fluorescence
spectrometry (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and nitrogen-physisorption
(BET). Column tests of green clay material and sand mixtures were performed to evaluate sorption in dynamic systems.
Adsorption conditions were examined by varying the initial Cr6+ concentration, flow rate and column height. The maximum purification was achieved at a concentration of 50 mg/L, a flow rate of 3mL/min and a bed height of 12 cm.
The mathematical models of Bohart-Adams, Thomas, and Yoon-Nelson were employed to analyze experimental data
and predict breakthrough curves in continuous adsorption. Through comparison of R2
values, it was determined that the
Yoon-Nelson and Thomas diffusion models effectively capture and accurately describe the experimental data.
The results obtained indicate a potential expansion of fixed-bed adsorption for the heavy metals treatment in industrialscale wastewater. Additionally, the natural green clay material exhibited remarkable reusability and showed promising
characteristics for various environmental and industrial applications.
Disciplines :
Materials science & engineering
Author, co-author :
Eloussaief, Mabrouk
Dammak, Nesrine
Ghrab, Sana
Ltaief, Olfa Ouled
Hamza, Wiem
Lambert, Stéphanie ; Université de Liège - ULiège > Department of Chemical Engineering
Zaitan, Hicham
Benzina, Mourad
Language :
English
Title :
Green Clay Materials Applied in Packed Bed Columns for the Hexavalent Chromium Adsorption from Aqueous Solutions
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