Publications Scientifiques

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Author: search.filters.author.Abbas, MoussaSubject: search.filters.subject.Modelling

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    Elaboration of a new Activated Carbon derived from the Crown of Oak (ACOW) to removal the toxic Iodine: Kinetic, Isotherms modelling and Thermodynamics Study
    (Taylor & Francis, 2024) Aksil, Tounsia; Abbas, Moussa; Trari, Mohamed
    The current study aims to develop a new adsorbent material using oak crown and explore its effectiveness in removing I2 ions through a series of batch experiments. ACOW was characterised by zero charge (pHpzc) and FTIR spectroscopy. The impact of the initial I2 concentration (20-100 mg/L), temperature (25-55 °C), pH (2-14), adsorbent dosage (2-10 g/L), Stirring speed (100-900 rpm), particle size (100-2000μm) and contact time (0-30 min) on I2 adsorption was examined. The adsorption kinetic obeys the pseudo-second order model with a determination coefficient (R2) equal to 0.999. Adsorption follows the Langmuir equation well, with the best fit to the experimental data at equilibrium. A qmax value (= 103.606 mg/g) at 25°C and 120.773 mg/g at 55°C were eliminated under the optimised conditions, indicating homogeneous adsorption on the surface of the adsorbent. The thermodynamic parameters gave a negative free energy ΔGo (-3.445 to -5.629 kJ/mol), a positive enthalpy ΔHo (18.406 kJ/mol) and an activation energy Ea (= 22.599 kJ/mol), thus confirming the spontaneous and endothermic nature of adsorption of iodine on ACOW. The positive entropy ΔSo (0.0733 kJ/mol K) show increased randomness of the solid-liquid interface during the adsorption.
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    Removal of Methylene Blue in Aqueous Solution by Economic Adsorbent Derived from Apricot Stone Activated Carbon
    (Springer link, 2020) Abbas, Moussa; Trari, Mohamed
    Quantitative adsorption kinetic and equilibrium parameters for methylene blue (MB) used in the textile industry from aqueous solutions were reported in this study using pHPZC and UV-visible absorption spectroscopy. The effects of adsorbent dosage (1–10 g/l), agitation speed (100–1200 rpm), particule size (63 µm to 2 mm), initial dye concentration (4–15 mg/l), contact time, pH (2–14), and temperature (298–338 K) were determined to find the optimal conditions for adsorption. The FTIR spectroscopy is used to get information on interactions between the adsorbent and MB. The mechanism of adsorption of MB dyeing onto Apricot Stone Activated Carbon (ASAC) was investigated using the pseudo first-order, pseudo second-order kinetic, Elovich and intraparticles diffusion models. The adsorption isotherms of MB onto ASAC are determined and correlated with common isotherm equations. The smaller RMSE value obtained for the Langmuir model indicates the better curve-fitting and the monolayer adsorption capacity of MB is found to be 46.03 mg/g at 25 °C and 88.50 mg/g at 70 °C and pH 10. The evaluation of thermodynamics parameters such as the negative free energy ΔG° (+2.70025 to −1.76666 kJ/mol) and positive enthalpy change ΔH° (28.87613 kJ/mol) indicated a spontaneous and endothermic nature of the reaction with chemisorption process. This study in tiny batch gave rise to encouraging results, and we wish to achieve the adsorption tests in column mode under the real conditions applicable to the treatment of industrial effluents. The present investigation showed that ASAC is potentially a useful adsorbent for the heavy metals and dyes