Publications Scientifiques
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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 Adsorption of malachite green onto walnut shells : kinetics, thermodynamic, and regeneration of the adsorbent by chemical process(Korean Fiber Society, 2023) Merrad, Samiya; Abbas, Moussa; Trari, MohamedThe textile industry produces huge amounts of wastewaters containing synthetic and toxic dyes. The aim of this study was to evaluate the adsorption of Malachite green (MG) onto Activated Carbon from Walnut Shells (ACWS) realized in a batch system. The effects of contact time, initial pH, stirring speed, particle size, temperature, adsorbent dose, and initial MG concentration on the adsorption capacity were investigated graphically for determining optimum conditions. The experimental isotherm data were analyzed by the Langmuir, Freundlich, Temkin, and Elovich models. The adsorption follows well the Langmuir equation, providing a better fit of the equilibrium adsorption data. Under optimized conditions, up to 154.56 mg/g at 25 °C and 370.37 mg/g at 45 °C were removed from the solution. The adsorption mechanism of MG onto ACWS was studied using the first-pseudo-order, second-pseudo-order, Elovich and Webber–Morris diffusion models. The adsorptions’ kinetic was found to follow rather a pseudo-second-order kinetic with a determination coefficient (R2) of 0.999. The adsorption isotherms at different temperatures have been used for the determination of thermodynamic parameters, i.e., the free energy ΔGo (0.802 to − 2.123 kJ/mol), positive enthalpy change ΔHo(18.547 kJ/mol), entropy (ΔSo = 0.064 kJ/molK), and activation energy (Ea = 14.813 kJ/mol). The negative ΔGo and positive ΔHo values indicate that the overall MG adsorption is spontaneous and endothermicItem 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 Contribution of adsorption and photo catalysis for the elimination of Black Eriochrome (NET) in an aqueous medium-Optimization of the parameters and kinetics modeling(Elsevier, 2020) Abbas, Moussa; Trari, MohamedThe adsorption and photocatalytic degradation of Black Eriochrome (NET), a dye selected as a model organic pollutant, has been investigated in aqueous suspension of TiO2 as photo catalyst under UV irradiation. The elimination of NET, an organic compound widely used in the textile industry, was realized by photo degradation. The advanced oxidation process (AOP) concerns the active species generated in the landfill, mainly the HO• radicals. These species induce highly oxidizing properties for the destruction of the organic waste. The adsorption and photo catalytic degradation of NET has been investigated in aqueous TiO2suspension under UV irradiation. To determine the equilibrium time, fine TiO2 powder was dispersed in NET solution under continuous stirring; the NET concentration gradually decreases and stabilizes after 20 min of contact. The modeling of this kinetic followsthe pseudo-first order kinetic model with a high determination coefficient (R2 = 0.999) and a capacity qe,cal in good agreement with the experimental data. The photo degradation experiments were undertaken to evaluate the effect of the analytical parameters influencing the NET removal efficiency. It has been observed that under optimal conditions (pH 12, adsorbent dosage 1 g/L, stirring speed 200 rpm and contact time 120 min), 92.9 % removal efficiency of NET was obtained for a concentration of 46 mg/L.The photocatalytic degradation rate was favored for high NET concentrations of solution in agreement with the Langmuir-Hinshelwood (L-H) modelItem Modeling of adsorption isotherms of (5, 5' disodium indigo sulfonate) from aqueous solution onto activated carbon : equilibrium, thermodynamic studies, and error analysis(Taylor & Francis, 2019) Harrache, Zahia; Abbas, Moussa; Aksil, Tounsia; Trari, Mohamed