Publications Scientifiques

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    Montmorillonite/Poly(Pyrrole) for Low-Cost Supercapacitor Electrode Hybrid Materials
    (MDPI, 2024) Hamidouche, Fahim; Ghebache, Zohra; Lepretre, Jean-Claude; Djelali, Nacer-Eddine
    Conductive polymers such as polypyrrole have been widely used as pseudo-capacitive electrodes for supercapacitors. This work demonstrates a simple method to improve the performance of conductive polymer electrodes by adding montmorillonite in order to perform capacitive behavior. Conductive composite polymers (CCPs) based on montmorillonite/polypyrrole (MMT/PPy(Cl)) have been synthesized by polymerization using FeCl3 as an oxidizing agent. During the preparation of CCP, the effect of MMT/pyrrole mass ratio and the influence of the amount of added H+ and temperature of the synthesis medium on the electrochemical performance of the composite have been investigated. The investigation associated with conductivity measurement allowed us to determine the best conditions to reach a high specific capacitance of 465 F gr−1 measured by cyclic voltammetry with respect to the CCP synthesized at ambient temperature (220 F gr−1) and a 35% increase in capacity compared to its homologue synthesized in neutral conditions at a low temperature. These performances have been advantageously correlated both to the edge acidity of the host material and to the evolution of its conductivity according to the preparation conditions. The galvanostatic charge/discharge tests also confirm the stability of the obtained composite, and a capacitance of 325 F g−1 for the best CCP is recorded with a regime of 1 A g−1. In addition, the durability of the device shows that the proposed material has a relatively good stability during cycling.
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    Electrocatalytic activity survey of some cathode materials for the reduction of nitrites and nitrates in aqueous solution
    (Publishing House of the Romanian Academy, 2020) Angar, Yassmina; Daoudi, Sofiane; Kebbouche-Gana, Salima; Djelali, Nacer-Eddine
    The electrochemical techniques are the subject of increasing interest on the environmental remediation methods thanks to their efficiency and their selectivity. It was classified among the cleanest methods because it does not produce sludge and undesirable intermediate byproducts. For these reasons, we have chosen this technology for the reduction of nitrites and nitrates ions from aqueous solutions. The objective of our study is the comparison of several cathodes materials performances, in order to promote an optimal electro-reduction of these ions. Indeed, we have used the copper, graphite, stainless steel and zinc as cathodes; among them, we have selected the most efficient on which we have optimized the operational conditions. The results suggested that the copper cathode was the most efficient for the reduction of both tested ions compared to the other tested materials. Therefore, the optimization of operational conditions allows us to fixed them at: scan rate=50 mV/s, initial effluent concentration=100 mg/L, pH=7 and potential range of the cyclic voltammetry scanning of [-1,+1]V/SCE for both ions. Under these optimal parameters, the reduction yield after 45min was important that can achieve 96.5% and 99% for nitrites and nitrates respectively
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    Cyclic voltammetry and galvanostatic effect on prepared Polypyrrole/Ni0.3Co2.7O4 for O2 electrocatalysis
    (Institute of Physics Publishing, 2019) Belkessam, Celia; Mechouet, Mourad; Idiri, Naima; Ghilane, Jalal; Djelali, Nacer-Eddine
    Ni0.3Co2.7O4 oxide embedded Polypyrrole (Ppy) thin films were successfully synthesized over glassy carbon disk (GC) part of rotating ring disk electrode (RRDE) by two different electropolymerisation route i.e. galvanostatic (GS) and multi-cyclic voltammetry (CV), from a solution containing 0.1 mol L -1 pyrrole (Py) and 7 g L -1 of Ni0.3Co2.7O4. The Ppy electrodeposition signal has been studied by varying two parameters i.e. the oxide nanoparticles (NPs) presence and the preparation method. In addition, the obtained hybrid electrode morphology, stability especially in methanol presence, and electrocatalytic activity towards the oxygen reduction reaction (ORR) have been also investigated. The results reveal that the obtained films properties have been affected by the used route and furthermore by the oxide addition. The CV shape was maintained in the NPs presence, however the reversibility behavior was better, since the potential gap between doping/dedoping processes became closer and its corresponding currents are significantly risen. The two synthesis methods lead to hybrids electrodes with pronounced ORR electrocatalytic activity. Thus, the GS obtained material exhibits a weak selectivity regarding electrons exchanged number and the H2O2 produced amount was only about 50%. However, these interesting properties were enhanced i.e. mainly 2 electrons were exchanged by producing 96% of H2O2, when the composite electrode was prepared by CV route. Moreover, this catalyst has good stability, as well as a higher tolerance to methanol for relative long time. Therefore, the CV method can be very useful on conducting polymer/NPs materials synthesis for environmental applications requiring peroxides use
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    Kinetic and thermodynamic studies of the ammonium ions adsorption onto natural Algerian bentonite
    (Taylor & Francis, 2016) Angar, Yassmina; Djelali, Nacer-Eddine; Kebbouche-Gana, Salima
    Adsorption processes are the most recommended complementary techniques applied in the wastewater treatment owing to their low economic cost, recyclability, efficiency and low power consumption. Clays known for this treatment are aluminosilicate minerals which contain different exchangeable ions on their surfaces. In the structure of bentonite surface, several cations have the exchange ability such as calcium, sodium, magnesium and potassium. This propriety is responsible for the adsorption of several cationic water pollutants. In this study, natural bentonite particles of 80 μm in diameter were considered and kept stirring at 200 RPM in a contaminated solution with ammonium ions. The effect of contact time and temperature showed that at an optimal temperature of 30°C and during a short stirring time of 50 min, the removal efficiency could reach its maximum of 53.36%. The kinetic study of the ammonium adsorption reaction on natural bentonite allowed concluding that the reaction is obeyed to the first-order model. Determination of various thermodynamic parameters suggests that the reaction is spontaneous and exothermic
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    Enhancing the Supercapacitive and Conductivity Properties of Polypyrrole via In-situ Polymerization with HY Zeolite Nanoparticles
    (Springer link, 2020) Hamidouche, Fahim; Ghebache, Zohra; Boudieb, Naima; Sanad, Moustafa M. S.; Djelali, Nacer-Eddine
    Highly stable zeolite HY/polypyrrole composite material was successfully fabricated by applying in-situ chemical polymerization approach. The functional properties of the prepared zeolite HY particles/polypyrrole were systematically inspected using XRD and FT-IR characterization techniques. Thermal stability and optical properties were consistently studied using TGA and UV–Vis spectroscopy techniques. The value of band gap energy (Eg) of the produced zeolite HY/polypyrrole nanocomposite was lower than the values of its individual components. Cyclic voltammetry studies concluded that HY/polypyrrole electrode material with mass ratio ~ 0.4 prepared at cold polymerization conditions ~ 0 °C exhibited the highest values of specific capacitance ~ 310 F g−1 and ionic conductivity ~ 1.7 S cm−1. The fabricated zeolite HY/polypyrrole composite material at 0 °C revealed a capacitance retention ~ 93.4%, while the other composite prepared at 25 °C possessed a capacitance retention ~ 72.4% after 500 charge/discharge cycles. The electrochemical impedance spectroscopy (EIS) measurement for the optimized composite electrode materials confirmed the cyclic stability after long term cycling of about 5000 cycles as a result of higher ionic conductivity between active material and ionic species than that value before cycling
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    The Application of Enzymological Techniques for Determination of the Inhibitor Activity of Bio Enzym Extracted from Seawater Bacteria P s eudomonas aerogenosa to Fight Biocorrosion of Carbon steel
    (Central de Documentare Al Industriei Chimice Ri, 2017) Khoukhi, Faiza; Kebouche, Salima; Djelali, Nacer-Eddine; Gana, Mohamed Lamine
    The paper presents a studies for the development of new corrosion inhibitors by biotechnological way applicable to many areas of petroleum industry including, characterization of protective films on carbon steel and biocorrosion inhibition. Our research is oriented towards the isolation of new strains of bacteria from the sea waters of the Mediterranean region that have power (inhibitory and/or bactericidal that blocks the growth of sulfate-reducing bacteria responsible for microbiologically influenced by production of Pyocyanin (1 hydroxyphenazin) or 5-methylphenazin-1-one. Our first objective was to isolate the population of Pseudomonas Aerugenosa on a specific medium, characterization gram, then fermentation in a nutrient broth. The second objective of this study is evaluation of corrosion rate by weight loss method with injecting different dose of the crude enzyme extract CEE containing the methylphenazine (Pyocyanin). An efficacy test was performed on test kit vials containing the specific culture medium with the SRB contaminated with industrial injection water from SONAHESS region. The total disappearance of the SRB is 40% of CEE by blocking their metabolism in the growth phase confirms the efficiency of treatment
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    Contribution to the study of the ammonium electro-oxidation in aqueous solution
    (Taylor & Francis, 2017) Angar, Yassmina; Djelali, Nacer-Eddine; Kebbouche-Gana, Salima
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    Synthesis and characterization of HY Zeolite-doped poly(aniline) by chemical oxidation method
    (2016) Ghebache, Zohra; Djelali, Nacer-Eddine; Zitouni, Safidine; Hamidouche, Fahim
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    Investigation of ammonium adsorption on Algerian natural bentonite
    (Springer, 2016) Angar, Yassmina; Djelali, Nacer-Eddine; Kebbouche-Gana, Salima
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