Publications Scientifiques

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Author: search.filters.author.Sahmoune, Mohamed NasserSubject: search.filters.subject.Kinetics

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Now showing 1 - 8 of 8
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    Equilibrium and Kinetic Modelling of Astrazon Yellow Adsorption by Sawdust: Effect of Important Parameters
    (2010) Ouazene, Naima; Sahmoune, Mohamed Nasser
    This paper aims to investigate the sorption of Astrazon yellow (A.Y.) onto sawdust (Aleppo pine tree), a forest waste as that acts as a low-cost adsorbent. In our experiments, the batch sorption is studied with respect to solute concentration, contact time, adsorbent dose, particle size and pH. The adsorption process attains equilibrium within 300 minutes. The extent of dye removal decreased with increasing particle size and increased with increasing contact time, adsorbent dose and pH. The equilibrium data were analysed by the Langmuir and Freundlich isotherms. The characteristic parameters for each isotherm were determined. By considering the experimental results and adsorption models applied in this study, it can be concluded that equilibrium data were represented well by the Langmuir isotherm equation. Maximum adsorption capacity calculated at 293K was 81.8 mg/g. Five kinetic models (pseudo-first order, pseudo-second order, fractional power, Elovich and intraparticle diffusion kinetic equations) were used to predict the adsorption rate constants. The kinetics of adsorption of the basic dye followed both Elovich and pseudo-second order kinetics, and intraparticle diffusion was not the sole rate-controlling step. The effective diffusion of Astrazon yellow in sawdust according to Boyd Model was 24.22 .10􀀀12 m2/S. In order to reveal the adsorption characteristic of sawdust samples, SEM and FTIR spectra analyses were carried out. The results show that sawdust (Aleppo pine tree) can be an alternative low-cost adsorbent for removing cationic dyes from wastewater.
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    Adsorption of auramine-O using activated globe artichoke leaves : kinetic and isotherm studies
    (Chemic Publishing Company, 2017) Laribi, Kahina; Sahmoune, Mohamed Nasser
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    Adsorption of auramine-O using activated globe artichoke leaves : kinetic and isotherm studies
    (Chemic Publishing Company, 2017) Laribi, Kahina; Sahmoune, Mohamed Nasser
    The aim of this work was to study the removal of auramine-O (Au-O) from aqueous solution using powder prepared from globe artichoke leaves chemically activated with NaOH solution. The physico-chemical characteristics of the samples were performed and the characterization by FT-IR analysis has been carried out to examine the structure of globe artichoke leaves before and after activation. Scanning electron microscope was used to analyze the surface change of the globe artichoke leaves before and after adsorption of dye solution. A comparison of two models on the overall adsorption rate showed that the kinetic of adsorption was better described by the pseudo-second order model. The equilibrium data fitted very well to Langmuir model with maximum monolayer adsorption capacity of 344.8 mg g-1 at 298 K. This study shows that the globe artichoke leaves can be used as low cost alternative adsorbent for removal of auramine-O
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    Biosorption of Cr (III) from aqueous solutions using bacterium biomass Streptomyces rimosus
    (2009) Sahmoune, Mohamed Nasser; Louhab, K.; Boukhiar, A.
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    Kinetic and equilibrium models for the biosorption of Cr(III) on streptomyces rimosus
    (Taylor & Francis, 2009) Sahmoune, Mohamed Nasser; Louhab, K.; Boukhiar, A.; Addad, J.; Barr, S.
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    Biosorption of heavy metals by streptomyces species — an overview
    (Springer, 2013) Mosbah, Rachid; Sahmoune, Mohamed Nasser
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    Effect of calcium competition on chromium adsorption by fungi biomass
    (2006) Louhab, K.; Sahmoune, Mohamed Nasser; Addad, J.; Bar, S.
    The kinetics and thermodynamic of adsorption of a mono-solute of chromium ions and of a bi-solute of chromium and calcium ions by fungi biomass (Streptomycine rimosus) was investigated in a batch system. The experimental data were analyzed based by Langmuir isotherm and a Pseudo second order mechanism, in the both the mono-and bi-solute adsorption systems, in order to predict the rate constant of adsorption, the equilibrium capacity. The results indicate that the adsorption mechanism is described by Langmuir isotherm and a Pseudo-second-order. The equilibrium adsorption capacity and the equilibrium rate constant increased with an increase in the initial chromium concentration in both mono-and bi-solute adsorption systems. The adsorption capacity of chromium decreased with an increase in calcium concentration