Publications Internationales
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Item Adsorption Behavior of Methylene Blue Onto Activated Coconut Shells: Kinetic, Thermodynamic, Mechanism and Regeneration of the Adsorbent(SAGE, 2024) Abbas, Moussa; Trari, MohamedAdsorption techniques are widely used to remove some classes of pollutants from waters, especially those which are not easily biodegradable. The removal of Methylene blue (MB), as a pollutant, from waste waters of textile, paper, printing and other industries has been addressed by the researchers. The aim of this study is to eliminate MB by Activated Coconut Shells (ACS) produced at low cost by adsorption in batch mode. The ACS was characterized by the FTIR spectroscopy and point of zero charge (pHpzc: 5.06). Some examined factors were found to have significant impacts on the MB uptake of ACS like the initial dye concentration Co (40-120 mg/L), solution pH (2-8), ACS dose (1-12 g/L), agitation speed (50-500 r/min), particles size (1.0- 1.2 mm) and temperature (298-333 K). The best capacity was found at pH 6 with an adsorbent dose 8 g/L, an agitation speed 200 r/min and a contact time of 60 min. Modeling Kinetics and Isotherms shows that the pseudo-second-order kinetic model with R2 (0.935 -0.998) and Langmuir adsorption isotherm model provide better fitness to the experimental data with the maximum adsorption capacity of 30.30 mg/g at 25°C. The separation factor R L (0.933-0.541) in the concentration range studied (10-120 mg/L) shows a favorable adsorption. The isotherms at different temperatures have been used for the determination of the free energy ΔG ° (198-9.72 kJ/mol); enthalpy ΔH ° (82.082 kJ/mol) and entropy ΔS o (245.689 J/K mol) to predict the nature of MB adsorption process. The positive values of (ΔG o ) and (ΔHo ) indicate a non-spontaneous and endothermic MB adsorption with a chemisorption. The adsorbent elaborated from Coconut Shells was found to efficient and suitable for the removal of MB dye from aqueous solutions, due to its availability, low cost preparation and good uptake capacity.Item Removal of Amoxicillin From Wastewater Onto Activated Carbon: Optimization of Analytical Parameters by Response Surface Methodology(SAGE Publications Inc., 2024) Abbas, Moussa; Trari, MohamedAntibiotics are widely used in veterinary and human medicine, but these compounds, when released into the aquatic environment, present potential risks to living organisms. In the present study, the activated carbon (AC) used for their removals is characterized by FT-IR spectroscopy, BET analysis and Scanning Electron Microscopy (SEM) to determine the physicochemical characteristics. Response surface methodology (RSM) and Box-Behnken statistical design (BBD) were used to optimize important parameters including pH (2-12), temperature (20-45°C), and AC dose (0.05-0.20 g). The experimental data were analyzed by analysis of variance (ANOVA) and fitted to second-order polynomial using multiple regression analysis. The optimal conditions for maximum elimination of Amoxicillin (Amox) are (Dose: 0.124 g, pH 5.03 and 45°C) by applying the desirability function (df). A confirmation experiment was carried out to evaluate the accuracy of the optimization model and maximum removal efficiency (R = 89.999%) was obtained under the optimized conditions. Several error analysis equations were used to measure goodness of fit. Pareto analysis suggests the importance of the relative order of factors: pH > Temperature > AC dose in optimized situations. The equilibrium adsorption data of Amox on Activated Carbone were analyzed by Freundlich, Elovich, Temkin and Langmuir models. The latter gave the best correlation with qmax capacities of 142.85 mg/g (R2 = 0.999) at 25°C is removed from solution. The adsorption process is dominated by chemisorption and the kinetic model obeys a pseudo-second order model (R2 = 0.999).Item Reduction of 4-Nitrophenol and Adsorption of Rhodamine B Using Reduced Graphene Oxide-Copper Sulfide Nanomaterial(Pleiades Publishing, 2024) Mokhtari, S.; Aoudjit, Lamine; Ben Hariz, S. Habi; Dokhan, Nahed; Trari, MohamedPolyethylene imine (PEI) is used as an effective chemical agent for the reduction of graphene oxide (GO) to reduced graphene oxide (rGO). It is water-soluble, stable and cost-effective, and the reaction condition is easily achievable. The rGO nanocomposite are decorated with CuS nanoparticles by a single-step hydrothermal method. GO is assisted by precursors of Cu2+ and S2– in well-defined ratios. Several analysis methods are used such as UV–Vis, FTIR, XRD with SEM coupled with EDS to develop the structure and morphology of synthesized rGO-CuS nanocomposites. GO is assisted by Cu2+ and S2– precursors in well-defined ratios. Several analysis methods are used such as UV–Vis spectrophotometry, FTIR spectroscopy, X‑ray diffraction (XRD) and scanning electron microscopy (SEM) for the structural and morphological characterizations of the synthesized rGO-CuS nanocomposites. The structural and optical properties are discussed and the results obtained are compared to the literature. The prepared material has been tested in various applications, it is used as a Calisher for the reduction of 4-nitrophenol to 4-aminophenol and the degradation of Rhodamine B (Rh B).Item Hydrothermally synthesized reduced graphene Oxide-Copper sulfide nanomaterial for application as supercapacitor(Pleiades Publishing, 2023) Mokhtari, S.; Dokhan, Nahed; Aoudjit, Lamine; Trari, Mohamed; Omeiri, SaidThis work is dedicated to the synthesis of rGO-CuS (reduced graphene oxide-copper sulfide) nanocomposites through a low-cost and environmentally friendly method through a one-step hydrothermal low-temperature process without the use of surfactants. rGO was obtained by efficient reduction of GO with PEI (polyethylenimine), identified by XRD, and confirmed by FTIR, Raman, and XPS analyses. The XRD pattern shows the formation of CuS phase crystallized in a hexagonal structure, while the SEM image shows the growth of CuS nanocrystals on the rGO layer. TEM showed the formation of spherical CuS nanoparticles distributed on the rGO surface. When studying its electrochemical reaction, the synthesized nanocomposite exhibited pseudocapacitive behavior with a specific capacitance of 418 F g –1 .Item Catalytic Activity of Phenol Oxidation over Iron and Cooper-Exchanged Pillared Bentonite(Springer Nature, 2024) Chellal, Khalida; Hamidouche, Fahim; Boudieb, Naima; Meguellati, Zineb; Trari, MohamedAl, mixed Al–Fe and Al–Cu pillared clays were prepared by the conventional method in a diluted medium with two additional parameters for the synthesis; the first one is the cooling of the clay suspension and the second is the exchange between the clay and metal solutions before pillaring with the polymeric mixed solution. The solids were characterized by X-ray diffraction (XRD), N2 adsorption and H2-TPR. The effects of the atomic ratio (M/Al + M) and hydrolysis molar ratio (OH/M), on the basal spacing and/or the specific surface were examined. The exchange does not seem to fix more Cu as in the case of Fe. The dispersion of the cold clay suspension, before pillaring, leads to a greater basal spacing of the solid at room temperature. In the case of mixed Al–Fe exchanged and/or pillared clays calcined at 350 °C, the cold dispersion of the clay suspension increases the basal spacing from 15.89 to 17.44 Å and from 15.32 to 16.07 Å for MR-AlFe (10) and Fe/MR-AlFe (10) respectively. Catalytic Wet Peroxide Oxidation (CWPO) of phenol under mild conditions (25 °C, 1 atm) was carried out without correction of pH. Mixed Al–Fe and Al–Cu pillared clays have comparable performances, although they showed some differences in the H2O2 decomposition kinetics. A total conversion of H2O2 is obtained without the complete phenol conversion over mixed Al–Fe pillared clays suggesting the presence of active species in these catalysts. In a slight excess of H2O2, the activity increases for all Fe-based clays catalysts with increasing the Fe content. A total conversion of phenol was obtained within 15 h of reaction over Fe/MR-AlFe (10) and after extending the reaction time to 30 h in the presence of Fe/MR-Al. On the contrary, MR-AlFe (10) only converted 57.12% under the same conditions. MR-AlFe (10) has the greater basal space (17.44 Å) and is more active for H2O2 decomposition than Fe/MR-Al, which certainly allowed greater accessibility of the reactant to the Fe-species. Fe exchanged and post-pillared clay with mixed (Al–Fe) solution containing 10% Fe expressed as molar percentage {Fe/MR-AlFe (10)} was the most efficient for this reaction combining good catalytic activity with high stability against iron leaching (0.02%). It showed a total phenol degradation, the highest H2O2 decomposition (85.7%) and more than 80% of TOC removal after 15 h of reaction.Item Understanding the rate-limiting step adsorption kinetics onto biomaterials for mechanism adsorption control(SAGE Publications Ltd, 2024) Sahmoune, Mohamed Nasser; Abbas, Moussa; Trari, MohamedBiomaterials are a class of porous materials that have been widely exploited over the past two decades. However, the implications of controlling adsorption by rate-limiting steps are still not adequately established. Identifying the rate-limiting step is a promising approach for the design of adsorption systems. In this review, we study in detail the rate-limiting step of the adsorption of dyes in aqueous media on biomaterials to rationalize the factors governing the rate-limiting step involved in the adsorption process using empirical kinetics and mass transfer models. This knowledge is then applied to identify the best fit of these models to study the rate-controlling step involved in the adsorption process, which is crucial for the design of the adsorption system. This review first studies the limiting step of adsorption of dyes in an aqueous medium on biomaterials. Kinetic modeling is used to better understand the rate control step involved in biosorption. Generally, the equations used are empirical models of kinetics and mass transfer and the biomaterials come from the following categories: agricultural and industrial waste, algae, fungi, bacteria, and plants. In most adsorption studies reported in this review, the pseudo second-order model was found to be best suited for fitting the kinetic data of dyes on biomaterials, indicating that chemisorption is the rate-limiting step that controls adsorption. Concerning the diffusion effects of mass transfer, intraparticle diffusion is among the most often used models to examine the rate-limiting step which is controlled by both film diffusion and intraparticle diffusion. The first takes place when the external transfer is greater than the internal transfer while the opposite occurs in the case of porous diffusion. However, the majority of works do not study the real step of controlling the overall adsorption kinetics, namely, film diffusion or intraparticle diffusion.Item Contribution of photocatalysis for the elimination of Methyl Orange (MO) in aqueous medium using TiO2 catalyst, optimization of the parameters and kinetics modeling(Desalination Publications, 2021) Abbas, Moussa; Trari, MohamedThe photo degradation of methyl orange (MO) in water onto TiO2 under UV irradiation is investi-gated. The parameters (MO concentration, catalyst dose, time, flux intensity and pH) influencing the degradation kinetics are studied. The equilibrium adsorption time of MO in the presence of TiO2 is reached after 50min of contact. Addition of H2O2 and NaCl at concentrations ranging from 100 to 500ppm shows that the percentage of the photo degradation decreases with increasing the H2O2concentration. The best results are obtained for a concentration of 100mg/L, while NaCl has a neg-ative effect on the MO photo degradation. The photocatalytic degradation rate was favored at high MO concentrations in agreement with the Langmuir–Hinshelwood (L-H) model. The constants krand K for the MO photo degradation are found to be 0.048mgL/min and 16.246L/mg, respectivelyItem Removal of gentian violet in aqueous solution by activated carbon equilibrium, kinetics, and thermodynamic study(SAGE Publications, 2019) Abbas, Moussa; Harrache, Zahia; Trari, MohamedThe quantitative kinetic and equilibrium adsorption parameters for chlorure de méthylrosaniline (gentian violet, crystal violet) removed by commercial activated carbon were studied by UV–visible spectroscopy.Activated carbon with a high specific surface area 1250 m2/g was characterized by the Brunauer, Emmett et Teller (BET) method and the zero charge point pH (pzc). The adsorption properties of both activated carbon with gentian violet were conducted at variable stirring speed 100–700 trs/min, adsorbent dose 1–8 g/l, solution pH 1–14, initial gentian violet concentration 5–15 mg/l, contact time 0–50 min, and temperature 299–323 K using batch mode operation to find the optimal conditions for a maximum adsorption. The adsorption mechanism of gentian violet was studied using the pseudo-first-order, pseudo-second-order, and Elovich kinetic models. The adsorption kinetics was found to follow a pseudo-second-order kinetic model with a determination coefficient (R2) of 0.999. The Weber–Morris diffusion model was applied for the adsorption mechanism. The equilibrium adsorption data of gentian violet were analyzed by the Langmuir, Freundlich, Elovich, and Temkin models. The results indicate that the Langmuir model provides the best correlation (qmax = 22.727, 32.258 mg/g at 26 and 40°C, respectively). The adsorption isotherms at different temperatures have been used for the determination of thermodynamic parameters, i.e. free energy (ΔG° = − 2.30 to −5.34 kJ/mol), enthalpy (ΔH° = 36.966 kJ/mol), entropy (ΔS° = 0.131 kJ/mol K), and activation energy (Ea) 40.208 kJ/mol of gentian violet adsorption. The negative ΔG° and positive ΔH° indicate that the overall adsorption is spontaneous and endothermic in natureItem Performance of mixed mesoporous silica Si (Mes)-perovskite (P) to remove hydroxybenzene in aqueous solution-effect of parameters influencing the adsorption efficiency(Balaban Publishers – Desalination Publications, 2020) Abbas, Moussa; Aksil, Tounsia; Trari, Mohamed* Corresponding author.1944-3994/1944-3986 © 2020 Desalination Publications. All rights reserved.Desalination and Water Treatmentwww.deswater.comdoi: 10.5004/dwt.2020.26157202 (2020) 306–316OctoberPerformance of mixed mesoporous silica Si(Mes)-perovskite (P) to remove hydroxybenzene in aqueous solution — effect of parameters influencing the adsorption efficiencyMoussa Abbasa,*, Tounsia Aksila, Mohamed TraribaLaboratory of Soft Technologies and Biodiversity, Faculty of Sciences, University M’hamed Bougara, Boumerdes 35000, Algeria, Tel. +213 552408419; Fax: +213 21 24 80 08; emails: moussaiap@gmail.com (M. Abbas), tounsiaiap@gmail.com (T. Aksil) bLaboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB), BP 32-16111 Algiers, Algeria, email: mtrari@usthb.dz (M. Trari)Received 1 December 2019; Accepted 25 May 2020abstractMesopores are materials with pore diameters between 2 and 50 nm, are used in several fields such as catalysis, chromatography, adsorption, etc. This study focuses on the potential use of mesoporous Si(Mes) and perovskite (P) as adsorbents, their ability to remove hydroxybenzene from aqueous solutions and the possibilities of elimination of a certain class of phenolic compounds, whose chem-ical structures of which contain functions capable of interacting on the surface of the supports. The adsorbent was characterized by Brunauer–Emmett–Teller, Fourier-transform infrared spectros-copy and X-ray diffraction methods. Batch adsorption experiments were undertaken to assess the effect of physical parameters on the hydroxybenzene removal efficiency. It has been observed that under optimized conditions (pH 4; adsorbent dose 1 g L–1; agitation speed 200 rpm; contact time 90 min); up qmax of 4.210 g of hydroxybenzene/g adsorbent at 25°C were removed from the solution. The adsorption by the adsorbent follows a pseudo-second-order kinetic model with a determina-tion coefficient (R2) of 0.999; which relies on the assumption that the physisorption may be the rate-limiting step. The adsorption at different temperatures has been used for the determination of thermodynamic parameters, the negative free energy (ΔG°) and positive enthalpy (ΔH°) indicate that the overall adsorption is spontaneous and endothermic, while the negative value (ΔS°) states clearly that the randomness increases at the solid-solution interface during the phenol adsorption onto Si(Mes)-(P), indicating that some structural exchange may occur among the active sites of the adsorbent and the ionsItem Removal of Methylene Blue in Aqueous Solution by Economic Adsorbent Derived from Apricot Stone Activated Carbon(Springer link, 2020) Abbas, Moussa; Trari, MohamedQuantitative 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