Publications Internationales

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Author: search.filters.author.Trari, MohamedStart date: 2020

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    Experimental and modelling study of adsorption and diffusion of hexavalent chromium in zeolitic imidazolate framework-11
    (Taylor and Francis, 2025) Lamari, Rachid; Benotmane, Bénamar; Megherbi, Hamza; Brahmi, Aghilas; Djaoui, Souad; Trari, Mohamed
    In this study, Zeolitic Imidazolate Framework-11 (ZIF-11) was successfully synthesised at room temperature and characterised by XRD, SEM/EDAX, TGA/DSC, FTIR, and CO₂ adsorption techniques. The material exhibited high crystallinity, well-defined morphology, a thermal stability up to 350 °C, low synthesis cost, and the possibility of scaling up production. Motivated by these favourable properties, ZIF-11 was investigated as an adsorbent for the removal of (Formula presented.) from aqueous solutions. Optimal adsorption conditions were found to be a pH 2, a stirring speed of 400 rpm, a contact time of 70 min and a 20 mg dose of ZIF-11 for 50 mL of (Formula presented.) solution. Thermodynamic studies indicated that the adsorption process is spontaneous and endothermic. Kinetic analysis showed that the adsorption follows the pseudo-second-order model, suggesting chemisorption as the dominant mechanism. Isotherm modelling using Langmuir and Freundlich equations confirmed a uniform distribution of (Formula presented.) species on the ZIF-11 surface. The maximum adsorption capacity of ZIF-11 was found to be 10.61 mg/g, surpassing many reported adsorbents. These findings demonstrate that ZIF-11 is a highly promising material for the (Formula presented.) removal from water. Its excellent adsorption capacity, thermal stability, and ease of synthesis highlight its potential for practical applications in water treatment and environmental remediation.
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    Olive Leaf Extract as a Potential Anti-Corrosion of Copper-Nickel in Natural Seawater
    (Springer Science and Business Media, 2025) Bourouis, Douniazed; Ghemmit-Doulache, Naima; Bounechache, Foudil; Trari, Mohamed
    This study investigates the phenolic composition of olive leaves from Skikda region (Northern Algeria), focusing on their therapeutic potential for diabetes and hypertension due to their high content of phenols, particularly oleuropein. The leaves were dried, micronized and characterized by FT-IR spectroscopy. The obtained powder was subjected to various extraction techniques, including microwave, Soxhlet, Ultrasound-Assisted Extraction (USAE) and traditional maceration. The extracted compounds were analyzed by gas chromatography-mass spectrometry (GC/MS) and Ultra-High Performance Liquid Chromatography (UHPLC) coupled with electrospray ionization-quadrature-time-of-flight mass spectrometry (ESI-Q-TOF-MS). The presence of olivetol and two oleuropein isomers, highlighted the rich phenolic profile of the leaves. The study also examines the efficacy of olive leaf extract, particularly from traditional maceration, to prevent corrosion in the Cu-Ni alloy (90/10) seawater, one of the most corrosive environments. The results showed a high inhibitory efficiencies of 96.8% for the highest concentration (S1) by Tafel and 93% for the lower concentration (S3) by Electrochemical Impedence Spectroscopy (EIS). Scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) analyses confirmed that the surface of the treated alloy remains free of corrosion, unlike the untreated alloy, which shows significant deterioration with a black corrosion layer attributed to the cuprite Cu2O. The study focuses on the identification of olivetol in olive leaf extract and its remarkable properties, for potential and preventive applications against corrosion
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    Engineering of Natural Clay-Based Materials to Eliminate Toxic Pb(II): Kinetic, Thermodynamic, and Adsorption Mechanism
    (PHYSICOCHEMICAL PROCESSES AT THE INTERFACES Published, 2025) Abbas, Moussa; Trari, Mohamed
    Climate change poses a threat to the water security by altering the precipitation patterns and other weather variables, which affect stream flow and freshwater availability. In this study, a soil and water assessment tool was used for the scarcity of blue and green water for future periods for sustainable management of freshwater resources away from lead pollution. Indeed, the presence of Pb2+ is an environmental problem and we have explored the use of natural phosphates (NP) as adsorbents for its elimination. The adsorbent NP was characterized by FTIR spectroscopy, scanning electron microscopy (SEM) and BET analysis. Batch adsorption experiments were performed to examine the effects of physical parameters namely the contact time, pH, stirring speed, temperature, adsorbent dose and initial Pb2+ concentration on the uptake capacity. Different models were used to fit the experimental data and to evaluate the kinetics, isotherms and thermodynamics of the Pb2+ adsorption. A high adsorption capacity of 66.66 mg/g was reached at 25°C and pH 6 and follows the Langmuir isotherm with a pseudo-second order kinetic. The adsorption is spontaneous and endothermic, indicating a structural exchange between NP and Pb2+ ions. Such results suggest that NP is a promising adsorbent for Pb2+ removal from wastewater
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    Engineering of Natural Clay-Based Materials to Eliminate Toxic Pb(II): Kinetic, Thermodynamic, and Adsorption Mechanism Study
    (PHYSICOCHEMICAL PROCESSES AT THE INTERFACES, 2025) Abbas, Moussa; Trari, Mohamed
    Climate change poses a threat to the water security by altering the precipitation patterns and other weather variables, which affect stream flow and freshwater availability. In this study, a soil and water assessment tool was used for the scarcity of blue and green water for future periods for sustainable management of freshwater resources away from lead pollution. Indeed, the presence of Pb2+ is an environmental problem and we have explored the use of natural phosphates (NP) as adsorbents for its elimination. The adsorbent NP was characterized by FTIR spectroscopy, scanning electron microscopy (SEM) and BET analysis. Batch adsorption experiments were performed to examine the effects of physical parameters namely the contact time, pH, stirring speed, temperature, adsorbent dose and initial Pb2+ concentration on the uptake capacity. Different models were used to fit the experimental data and to evaluate the kinetics, isotherms and thermodynamics of the Pb2+ adsorption. A high adsorption capacity of 66.66 mg/g was reached at 25°C and pH 6 and follows the Langmuir isotherm with a pseudo-second order kinetic. The adsorption is spontaneous and endothermic, indicating a structural exchange between NP and Pb2+ ions. Such results suggest that NP is a promising adsorbent for Pb2+ removal from wastewater
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    Synthesis and characterization of MoO3: application to the photo production of oxygen under visible light
    (Springer, 2024) Koriche, Nesrine; Abbas, Moussa; Trari, Mohamed
    One of the most striking features of molybdenum oxide is the versatility of its catalytic properties, which are determined by the valence states of molybdenum and its coordination. It may be anticipated that MoO3 surface must contain catalytic sites which are active in different types of elementary steps. MoO3 was successfully synthesized by hydrothermal route at 400 °C, acquiring n-type conduction, due to oxygen deficiency. The single phase, elucidated by X-ray diffraction, crystallizes in an orthorhombic unit cell (Space Group (SG) Pbnm, N° 62) with a crystallite size of 12 nm. MoO3 is a direct band gap semiconductor with a forbidden band value of 2.93 eV where the electrical conduction occurs by low polaron hopping between mixed valences Mo+6/+5 with an activation energy of 0.14 eV. The thermo-power indicates n-type conduction, and confirmed by the capacitance-potential measurement; the latter gives an electrons density of 1.87 × 1020/cm3and a mobility of 1.77 × 10−6 m2/V.s. The flat band potential Vfb (0.11 VSCE) is determined from the capacitance measurement. The physical and chemical characterizations are correlated for the construction of the potential diagram in order to assess the photo electrochemical properties of MoO3 for the oxygen evolution. The valence band, is located above the O2/H2O potential ( ~ 1.3 VSCE), allowing O2 evolution upon visible light and the oxide is photocathodically protected against corrosion. An evolution rate of 0.13 mL/(mg. h) is obtained within 20 min. at optimal conditions (100 mg of catalyst and 50 °C).
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    Adsorption Behavior of Methylene Blue Onto Activated Coconut Shells: Kinetic, Thermodynamic, Mechanism and Regeneration of the Adsorbent
    (SAGE, 2024) Abbas, Moussa; Trari, Mohamed
    Adsorption 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.
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    Electrochemical Study of CuFe2O4 Synthetized by Sol–Gel and Electro-photo-oxidation of Rhodamine B Under Sunlight
    (Springer, 2024) Touati, H.; Sahmi, A.; Trari, Mohamed
    The spinel CuFe2O4 elaborated by sol–gel route crystallizes in a tetragonal structure with a crystallite size of 444 ± 2 nm and a zeta potential of − 35 mV. The diffuse reflectance spectroscopy and photo-electrochemistry were undertaken for its characterization. The direct gap (1.55 eV) ideal for the solar energy conversion is assigned to the transition :Feoc3+:t2g→Feoc4+: eg in agreement with the red color, allowing more than half of the solar spectrum to be converted into chemical energy. The narrow valence band deriving from Fe3+: t2g orbital induces a low electron mobility (µ = 8.91 × 10−13 cm2 V−1 s−1). The cyclic voltammetry in Na2SO4 (10−2 M) exhibits low hysteresis that resembles a chemical diode. The electrical conductivity of CuFe2O4 is a characteristic of a non-degenerate semiconductor with activation energy (Ea) of 0.20 eV where the electron transfer occurs by low lattice polaron hopping between mixed valences Fe4+/Fe3+ octahedrally coordinated. The semi-logarithmic plot (logJ–E) indicates a chemical stability of CuFe2O4, while the photo-chronoamperometry corroborates the p-type behavior, a result confirmed by the capacitance measurement where an electron density (NA) of 0.176 × 1023 cm−3 and a flat band potential (Efb) equal to − 0.56 VSCE were extracted. As application and on the basis of the potential diagram, Rhodamine B (Rh B, 20 mg L−1), a cationic dye, is electrostatically attracted by the electrode surface and successfully oxidized by electrocatalysis on CuFe2O4. The kinetics of oxidation of Rh B followed by chemical oxygen demand (COD) analysis, which gave an abatement of 56% under a current of 150 mA, an enhancement up to 70%, was reached by electro-photocatalysis under sunlight smaller than that analyzed by UV–visible spectrophotometry (88%). The color removal follows a pseudo-first-order model with a half-life t1/2 of 57 min; a reaction mechanism by O2•− and •OH radicals is suggested. Graphical Abstract: (Figure presented.)
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    Removal of Amoxicillin From Wastewater Onto Activated Carbon: Optimization of Analytical Parameters by Response Surface Methodology
    (SAGE Publications Inc., 2024) Abbas, Moussa; Trari, Mohamed
    Antibiotics 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).
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    Electrochemical Deposition of Hematite α-Fe2O3 Thin Films for Photo-Current Generation Application
    (Pleiades Publishing, 2024) Mokhtari, S.; Bouhdjer, Lazhar; Dokhan, Nahed; Aoudjit, Lamine; Imma, H.; Omeiri, Said; Trari, Mohamed
    In the field of sustainable hydrogen production, hematite (α-Fe2O3) is a promising material owing to its optical band gap and water oxidation/reduction energies. In this context, the main objective of this work is devoted to the synthesis of α-Fe2O3 by electrochemical anodization of iron sheet using two anodization voltages (20 and 30 V), followed by annealing at 450°C (1.5 h) in air. Indeed, annealing is a necessary but not sufficient condition for the hematite prepared electrochemically. Furthermore, we discuss the effect of anodizing voltage and analyze its influence on the properties of the films namely structural, morphological, optical, electrochemical and photoelectrochemical (PEC) properties. The annealed Fe2O3 sample, anodized at 30 V, demonstrates a net photocurrent density of 0.81 mA/cm2 at 0.744 VRHE in KOH (1 M). The obtained results indicate that the α-hematite thin films synthesized by anodization technique under optimized conditions is a promising photoanode in PEC cells.
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    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, Mohamed
    Polyethylene 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).