2018
Application of hydroxy-aluminum-and cetyltrimethylammonium bromide-intercalated bentonite for removing acid and reactive dyes
La revue : Desalination and Water Treatment
Domaine : chimie
Mots Clés : Bentonite; Modified clay; Heavy metals; Adsorption kinetics
Auteur : F. Zahaf , R.Marouf, F.Ouadjenia, J. Schott
Issn : 1944-3994 Eissn : 1944-3986 vol : 131, Num : , pp : 282–290
Résume :

Clays intercalated with organic molecules and/or hydroxy-metal cations, also known as inorganic– organic clays (IOCs), have attracted a great deal of attention among researchers in recent years. In the present work, cetyltrimethyl ammonium bromide (CTMAB) and hydroxy-aluminum (Al13) were selected to be used as intercalants in bentonite that was originally brought from the town of Mostaganem (Algeria). The modified bentonite materials were used to adsorb three heavy metals, namely Pb(II), Cr(III) and Cu(II). Some samples of B–Al and B–CTAB were prepared and characterized using different techniques, like XRD, FTIR, and BET. The adsorption process was carried out under various operational conditions by varying the temperature, initial concentration of metal and contact time. The results obtained indicated a significant increase of the interlayer spacing after intercalation with CTAB. The BET surface area also increased. The sequence of adsorption capacity for the three metals was found to be like Cr3+ > Pb2+ > Cu2+. The adsorption kinetics could be very well described using the pseudo-second order kinetic model. The Intra-Particle Diffusion (IPD) model for sorption was also investigated and compared to other models; it was used to identify the sorption mechanism. Several thermodynamic studies found out that the adsorption process is endothermic and spontaneous in nature.

2015
Removal of a textile dye by pillared clay
La revue : International Journal of Chemical and Environmental Engineering
Domaine : chimie
Mots Clés : Bentonite; intercalation; dye; adsorption
Auteur : F. Zahaf , R.Marouf, N.Dali , J. Schott
Issn : Eissn : vol : 6, Num : 01, pp : 11-14
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2015
Adsorption of Cationic Dye onto Silt Dam from Aqueous Solution
La revue : Proceeding of 2015 International Conference on Chemical, Metallurgy and Environmental Engineering
Domaine : chimie
Mots Clés : Adsorption; Malachite Green; Kinetic; Silt.
Auteur : F.Ouadjenia, F. Zahaf , R.Marouf,
Issn : Eissn : 978-93-84422-22-6 vol : , Num : , pp : 328-334
Résume :

In this work, the potential feasibility of silt dam for removal of malachite green (MG), a cationic dye from aqueous solution was investigated. XRD, MEB and chemical composition analysis were used to characterize the adsorbent material. XRD analysis identified illite as the major clay mineral. The effects of contact time and temperature (298, 303, 313 and 323 K) on the malachite green adsorption have been examined. The results indicated that dye removal was seen to increase with increasing contact time until equilibrium. The experimental isotherm data were analyzed using the Langmuir and Freundlich equations. Data isotherms were good fitted by Freundlich equation. Two kinetic models, the pseudo first order and second-order equations, were selected to follow the adsorption process. Kinetic parameters, rate constants, equilibrium adsorption capacities and correlation coefficients, for each kinetic equation were calculated and discussed. It was shown that the adsorption of malachite green onto adsorbent could be described by the pseudo second-order equation.