Journal Articles

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Author: search.filters.author.Saliha Bouranene

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    Study of the influence of operational parameters on the adsorption of a dye by a potato peels
    (Book Springer, Volume 1 Nanotechnology and advanced Materials, 2020-10-25) Saliha Bouranene; Souheila Bouacherine; Nora Sedira
    The growing demand for adsorbent materials for environmental protection processes is prompting further research in the manufacture of unconventional and low cost adsorbents. In this work we have prepared a material from a natural waste namely potato peels to clean up contaminated water with a cationic dye i.e. Methylene Blue (MB). Firstly a characterization of the material was carried out in terms of bulk density, ash content, moisture content, pH and electrical conductivity. A parametric study was carried out subsequently and revealed that this adsorbent gives a better adsorption efficiency with respect to BM molecules (Tx = 95.13%) during a contact time of 45 min for a solid mass (4 g), a speed stirring (150 rpm), a solid mass/liquid volume ratio (4 g/250 mL) and an initial dye concentration (10 ppm). The modeling of the adsorption results gave an L-type isotherm with good compatibility with the Langmuir and Freundlich models.
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    Kinetic Study of the Adsorption of Zinc and Copper Ions on to Activated Carbon Prepared from Date Pits
    (International Journal of New Chemistry, 2021-11-08) Saliha Bouranene; Nora Sedira; Lotfi Zeghadnia; Abde El Krim Guebail
    In the present work, an activated carbon material has been prepared from date pits to remove zinc (Zn2+) and copper (Cu2+) from a wastewater. The effect of some parameters on adsorption performance has been investigated. The optimization of operational conditions allowed increasing the adsorption of Zn2+ ions from 33% to 85% and the adsorption of Cu2+ from 23% to 70%. The optimum conditions found are a mass of adsorbent of 4g, a stirring speed of 500 rpm and a ratio of 15 for volume of liquid / mass of solid. It has been shown that the adsorbent has more affinity to the copper ions than zinc ions and the modeling results gave adsorption isotherms type “C”. The results also showed that the kinetics of zinc and copper ions adsorption were described by a pseudo second-order rate model and controlled by the internal diffusion which can be considered as limiting step that controls the rate transfer of these ions to the solid surface.
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    Ultrasound-assisted adsorption of Pb ions by carbonized/activated date stones from singles/mixed aqueous solutions
    (Journal of the Indian Chemical Society, 2022-01) Nora Sedira; Saliha Bouranene; Abdalhak Gheid
    This work aims to assess the adsorption efficiency of date stones biowaste subjected to carbonization and activation processes for the removal of Pb ions from single and mixed solutions. Several techniques have been used for characterization of adsorbents such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), methylene blue index and point of zero charge (pHpzc). An excellent adsorption capacity of 97.43% is achieved at an initial concentration of 300 mg/L, solution volume 75 mL of Pb nitrate, adsorbent mass of 0.7 g, temperature of 30 °C, a stirring speed of 500 rpm/min, a contact time of 180 min and pH 6. Specifically, a comparison has been conducted between carbonized/activated date stones “CADS” and commercial activated carbon “CAC” besides investigating the influence of the presence of Co ions and the utilization of ultrasound radiation. A higher adsorption rate of 98.16% is reached under ultrasound radiation at Pb(II) initial concentration of 100 mg/L for a contact time of 3 h. Nevertheless, the temperature has shown a negative effect; the adsorption rate decreases from 98.31% at 18 °C to 92.70% at 60 °C. The modeling of the experimental adsorption data manifests a type-L isotherm characteristic of Langmuir and Freundlich models. The kinetic study has shown that the experimental data are well described by a pseudo-second-order rate model and controlled by the internal diffusion, a limiting-step that controls the transfer rate of Pb(II) to the adsorbent surface. The calculated thermodynamic parameters (ΔG⁰, ΔH⁰, ΔS⁰) indicate that the adsorption of Pb(II) is spontaneous and exothermic process.