Department of Material Sciences

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Author: search.filters.author.Hattab ZhourStart date: 2020

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    Assessment and Modeling of Adsorption Capacity of a Cationic Dye on the Natural Silica of El-Aouanajijel in North-Eastern Algeria.
    (Annals of R.S.C.B., 2021-01-01) Guerfi Samia; Filali Naima; Deghfel Nadir; Berredjem Yamina; Hattab Zhour
    The aim of this work is to study the adsorption of basic dye, methylene blue (MB), from an aqueous solution onto natural silica. The adsorption of MB by natural silica was carried out in static mode. Effects of parameters such as mass of adsorbant, initial dye concentration, stirring velocity, temperature, and pH on adsorption were investigated. In order to study the mechanism of the adsorption process, three kinetic models including pseudo-first order, pseudo-second order, and intra-particle diffusion were used. In addition, the linear Langmuir and Freundlich models were applied to describe equilibrium isotherms. The experimental results of adsorbent/adsorbate equilibrium show that the adsorption was well described by the kinetic model of pseudo-second order and by the Langmuir adsorption isotherm model. Optimal conditions for the adsorption of MB by natural silica were found to be: Va = 200 rpm, T = 25°C, and pH = 8.
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    Removal of Malachite Green Dye From Aqueous Media using Helianthus Annuus Seeds Shells as Eco-Friendly Adsorbent: Optimization, Equilibrium, and Kinetic Studies
    (Annals of R.S.C.B., 2021-05-08) Hichem Fiala; Hacene Bendjeffal; Hamrouni Achraf; Lahmar Amina; Berredjem Yamina; Hattab Zhour; Gheid Abdelhak
    The fat diffusion of organic dyes in our environment has become a very serious ecological problem, which needs the improvement of new and low-cost methods for their elimination from aquatic media. In this In this approach, we studied the use of the Helianthus annuus seeds shells as natural, low-cost and eco-friendly adsorbent for the removal of the malachite green (MG) from aqueous media. The Helianthus Annuus seeds shells (HA-Ss) were characterized using various techniques such as FTIR, SEM, and ATG. The sorption tests were performed according to the Batch system, under the effects of four physicochemical factors, including the adsorbent mass (0.0025 and 5 g.L-1), medium pH (1-10), MG initial concentration (10-50 mg/L), and temperature (25-45°C). The removal optimal condutions were found to be 2.5 g/L of Helianthus annuus seeds shells, 20 mg/L as MG initial concentration, and pH 7 for 60 minutes of contact time with a removal efficiency up to 99%. Several kinetic models including pseudo-first order and pseudo-second order were used to describe MG adsorption mechanism, the modeling studies indicated that adsorption mechanism follows the pseudo-second-order kinetic model, and the adsorption isotherms follow the Freundlich model with Qe reached 7.69 mg/g.
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    Removal of Hexavalent Chromium Cr (VI) From an Aqueous Solution by an Industrial Waste from the Steelworks of the Algerian Steel Complex
    (Annals of R.S.C.B., 2021-05-08) HamrouniAchraf; Fiala Hichem; Ali Ahmed Atef; Boutaleb Yassira; Hattab Zhour; BerredjemYamina; Rebani Nacer; Guerfi Kamel
    Algeria has developed a dense Industrial network, concentrating polluting and water and energy consuming sectors. Slag, a waste product of the SIDER steel complex (Annaba, Algeria), was used as an adsorbent for the removal of hexavalent chromium from artificially contaminated aqueous solutions. The experiments were carried out in static regime. The determined best parameters influencing the adsorption such as mass of adsorbant, initial concentration, stirring speed, temperature, and pH, which allowed to reach a significant efficiency rate equal to 99% were as follow: Cr(VI) concentration of 10 ppm, pH 1, contact time at equilibrium 30 min and a temperature of 40°C. Modeling of the experimental data showed that the pseudo-second order model describes the adsorption kinetics in an adequate way. Also, the adsorption isotherms are in agreement with the Freundlich model. Furthermore, the thermodynamic analysis revealed that the studied adsorption process is a favorable, endothermic, and spontaneous phenomenon.