Journal Articles

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Start date: 2020

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    Goethite Nanofibers /CNTs based Nanocomposites Synthesized by Free-Template Hydrothermal Method and their Physico-Chemical Properties for Energy Storage Application
    (ENP Engineering Science Journal, 2023) S. Djelamda, F. Djefaflia, A. Harat, A. Nait-Merzoug, D. Momodu, M. Manyala, M. Guerioune and O. Guellati
    In this investigation, we report the synthesis of Goethite-NFs/CNTs nanocomposites using hydrothermal method at optimized growth condition. These nanostructured products have been characterized in order to identify their physico-chemical properties by different techniques, such as: X-Ray Diffraction (XRD), Raman Spectroscopy, High Resolution Scanning Electron Microscopy (FESEM), Thermal analysis (TGA/DTA) and UV- Vis Spectroscopy. The obtained Goethite nanofibers (NFs) have shown structured triangular base nanofibers with diameter in the range [181 - 363 nm]. Using nested and twisted CNTs (MWNTs type) but fairly homogeneous in diameter around 48 nm, the formation of an assembly of two forms (MWNTs and iron oxide Nanofibers) in nanocomposite configuration confirms the significant improvement of their physico-chemical properties, like the increase in their electrical conductivity proven by their obtained gap energy Eg from 3.12 to 2.50 eV. Consequently, the reached results prove clearly that this kind of iron oxide-NFs/MWNTs based nanocomposites can be excellent candidate as electroactive nanomaterials for energy storage application.
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    Electrochemical Measurements of Ni / Graphene based Nanohybrids for Electrochemical Energy Storage “ Supercapacitors”
    (ENP Engineering Science Journal, 2023) I. Djebablia, O. Guellati, N. Habib, A. Harat, F. Djefaflia, A. Nait-Merzoug, I. Janowska and M. Guerioune
    Given the issues related to the use of fossil fuels and water pollution, the development and the application of new smart nanomaterials for supercapacitors and biosensors has become a vital issue for human and industrial societies. Therefore, nanotechnology has given more interest to these areas via micro/nanosystems or nanohybrids characterized by interesting composition, significant porosity and texture at nanoscale. In this work, we have produced electroactive nanohybrids based on in-situ Ni mono-hydroxide few layers Graphene oxide "GO" using a simple and low cost hydrothermal technique under well-studied thermodynamic conditions (120 and 180 °C growth temperature), for performant supercapacitor devices. We have carried out the structural, morphological, textural and optical characterization of these products and consequently we have specified the relationship between their physico-chemical characteristics and their electrochemical properties for ulterior application. Thus, we have carried out various electrochemical measurements through CV tests and we have marked the important electrochemical properties of these Ni/Graphene nanohybrids in two NaOH electrolyte concentrations (0.1 and 1 M) in order to improve the performance of supercapacitors which have become a socio-economic issue with this nanotechnological development. Consequently, these obtained Ni/Graphene nanohybrids have shown a very interesting electrochemical results with specific capacities 1863 and 253 F.g-1 for the case of nanohybrid obtained at 6h/120°C in NaOH aqueous electrolyte with two different concentrations (1 and 0.1M), respectively. However, for a fixed electrolyte concentration of 1M NaOH, both nanohybrids obtained at 120 and 180°C gave specific capacity values around 1863 and 2981 F.g-1, respectively.
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    Physico-Chemical Properties of Three Synthesized Carbonaceous Nanomaterials (CNTs, GO, Biochar) for Perspective Application: Water / Soil Treatment and Energy Storage
    (ENP Engineering Science Journal, 2023) H. Araissia, O. Guellati, F. Abbaci, A. Harat, J. El-Haskouri, D. Begin, M. Guerioune and A. Nait-Merzoug
    Abstract− Nanotechnology has a more than important role in deducing the materials structure, especially carbon-based nanomaterials, including determining their properties and consequently their application field, such as: energy storage, environmental protection, biosensing and soil treatment. In this investigation, we report a comparison of three kinds of nanostructured carbon based smart nanomaterials synthesized at different dimension (1D, 2D and 3D) using physico-chemical growth processes. These carbonaceous products have been characterized in order to identify their attractive properties using different techniques, such as: XRD, FT-IR, TGA/DTA, FESEM microscopy, Raman and XSP spectroscopy. These obtained nanostructured carbon have shown structural forms in the case of MWNTs and graphene type having 1D and 2D configuration, respectively, as well as an amorphous form in the case of biochar having 3D porous configuration which contains less cohesive bonds than graphene and MWNTs. These two structured ones have a much more solid and cohesive structure thanks to the strength of their carbon bonds and their graphitization rate was proved from their Raman and XPS-C1s analysis spectra. Moreover, they have shown very interesting characteristics especially their specific surface area in the range 150-2400 m2/g and functional groups; which open up a wide field of application especially environmental protection and biosensing.
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    Optical and electrochemical properties of iron oxide and hydroxide nanofibers synthesized using new template-free hydrothermal method
    (Journal of Nanostructure in Chemistry, 2020) M. Boufas, O. Guellati, A. Harat, D. Momodu, J. Dangbegnon, N. Manyala and M. Guerioune
    We report the effect of hydrothermal synthesis conditions on the morphological, optical and electrochemical properties of as-prepared iron oxide (γ-Fe2O3) and hydroxide (α-FeOOH) nanostructures. The physico-chemical identification of these Febased nanostructures using X-ray diffraction, scanning/transmission electron microscopy, porosity and Raman spectroscopy analyses revealed a temperature-depended phase transformation. A maghemite and goethite iron-based nanostructured formation was observed in nanorod and trigonal nanofiber shape-like morphology with mean diameters ranging from 32 to 50 nm. The textural analysis of the nanofibers confirmed mesoporosity with a specific surface area of ~ 129 m2 g−1 (in γ-Fe2O3) and 23 m2 g−1 (in α-FeOOH). The electrochemical performance of the iron oxide and hydroxide nanofiber electrodes with and without the addition of activated carbon (AC) was also investigated. The sample electrodes composed of γ-Fe2O3, γ-Fe2O3/ AC, α-FeOOH and α-FeOOH/AC showed remarkable specific capacities of 164 mAh g−1, 330 mAh g−1, 51 mAh g−1 and 69 mAh g−1 at 1 A g−1 gravimetric current. The influence of the phase transformation linked to the synthesis temperature, and the inclusion of an electric double-layer AC material into the nanofibers clearly demonstrates an enhancement in their energy-storage capability. Furthermore, the Fe-based nanofibers exhibited excellent cycling stability with good capacity retention of 73% and 99.8%, respectively, after 2000 cycles at a high 30 A g−1 gravimetric current as well as low resistance obtained by impedance spectroscopy analysis. The implication of the results depicts the potential of adopting these γ-Fe2O3 nanorods as suitable material electrodes in electrochemical energy-storage devices.
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    Ni/Zn mayered double hydroxide (LDH) micro-nanosystems and their Azorubine adsorption performance
    (Applied Nanosciences, 2021) A. Nait-Merzoug, O. Guellati, S. Djaber, N. Habib, A. Harat, J. El-Haskouri, D. Begin and M. Guerioune
    A membranous shaped Ni/Zn layered double hydroxide based nanohybrid was obtained using a low-cost template-free hydrothermal process at optimized growth conditions of 180 C for 6 h. The synthesized nanohybrid was structurally, texturally and morphologically characterized using different techniques such as X-ray diffraction, FTIR, XPS spectroscopy, BET analysis and FESEM microscopy. The adsorption performance of our product was estimated through the Azorubine dye removal from synthetic wastewater. We therefore studied the synergic effects of Ni/Zn adsorbent dosage, contact time, pH, adsorbate concentration, stirring speed and temperature on the Azorubine adsorption efficiency. In this investigation, we obtained bi-structure based nanoadsorbent with 54% crystallinity order composed of nickel hydrate and zinc carbonate hydroxides in irregular nanoflake-like mesoporous nanohybrid morphology. Interestingly, it was also revealed to have high specific surface area (SSA) of around 110 m2 g􀀀1 with important textural properties of 18 nm and 0.68 cm3 g􀀀1 average pore size and volume, respectively. Moreover, the adsorption results revealed that this novel Ni/Zn layered double hydroxide (Ni/Zn LDH) was an efficient adsorbent for Az molecule and possesses an adsorptive ability exhibiting a short equilibrium time (60 min) and a high Az adsorption capability (223 mg g􀀀1). This fast removal efficiency was attributed to high contact surface area via mesoporous active sites accompanied with the presence of functional groups (OH􀀀 and CO3 2􀀀). In addition, the Langmuir and Freundlich isotherms were studied, and the results fitted better to the Langmuir isotherm.
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    Bio/KOH ratio effect on activated Biochar and their dye based wastewater depollution
    (Journal of Analytical and Applied Pyrolysis, 2022) F. Abbaci, A. Nait-Merzoug, O. Guellati, A. Harat, J. El-Haskouri, J. Delhalle, Z. Mekhalif and M. Guerioune
    Waste potatoes peels (WPP) were adopted as a Biomass in this investigation to produce highly porous activated Biochars. The carbonized-activation process was principally governed on double pyrolysis at 600 ◦C intercalated by intermediate thermal-chemical step for homogenous incorporation of KOH oxidation agent. The effect of CWPP/KOH precursors ratio and the second pyrolysis temperature were systematically carried out to study the activated Biochars physico-chemical properties (morphology, textural and chemical bands) using different techniques (XRD, FTIR, Raman, TGA/DTA, XPS, FESEM, EDX, CHNO/S, BET, Zeta potential). The obtained activated Biochars are in micro/nano-porous systems and have interesting SSA [580 – 2400 m2/g], pore volume [0.08 – 1.02 cm3/g] and average pores size < 4 nm depending to the activation conditions. Moreover, the second pyrolysis temperature has an effect on the carbon atoms structure reorganization which is proved through their high Raman and textural properties. To demonstrate the double activation process effectiveness and the resulting Biochars properties, we have studied their adsorption behavior to remove two kinds of dyes (cationic MB and anionic AZ). The obtained adsorption capacities have reached 1246 mg/g and 315 mg/g with an equilibrium contact time around [5–10 min] and [30–40 min] for MB and AZ dyes, respectively. These values have never been reported before, especially using the very low activated Biochar adsorbent quantity of 8 mg (at each initial pH and 100 mg/l concentration of each dye solution).
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    Design guidelines of InGaN nanowire arrays for photovoltaic applications
    (Islamic Azad University, 2021-07-24) Segmane; Sayad; Selatni; Nouiri
    III-Nitride NanoWire array Solar Cells (NWSCs) combine the inherent properties of III-N semiconductors with waveguiding and confinement properties of nanowire arrays. In the present paper, some design guidelines of NWSCs made from Indium-Gallium-Nitride InGaN alloys are presented. Firstly, a detailed balance analysis was performed to show the importance of using InGaN materials to effectively convert the light to electricity, followed by an optical modelling to point out the advantages of using periodic nanowire arrays in designing solar cells. From the detailed balance analysis, it is expected that single junction solar cells made from In0.63Ga0.37N alloy result in the highest light-to-electricity conversion efficiency of 31%, and the Rigorous Coupled Wave Analysis RCWA simulations show that nanowire arrays made from InxGa1-xN fractions (x values) ranging between 50 and 77% alloys may achieve efficiencies of more than 33%, with a maximum efficiency of 37.7% for In0.67Ga0.33N NW array. Substrate choice, array density and filling material impacts on device performance were also studied.
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    TOXICOLOGICAL EVALUATION OF A MONOAMMONIUM PHOSPHATE FERTILIZER IN RATS FOLLOWING 30 DAYS OF REPEATED ORAL EXPOSURE
    (Fresenius Environmental Bulletin, 2022) Araar Samia; Khaldi Fadila; Sayah Sarra; Chaib Sakina; Gheid Abdelhak
    The present study was undertaken to evaluate the subacute toxicity of a synthetic fertilizer widely used in agriculture (Phosfert®, monoammonium phosphate NH4H2PO4 (MAP)) on some haematolog-ical and biochemical profiles as well as liver and kid-ney histology in Wistar rats. MAP was administered to rats orally at 200, 400, and 800mg/kg of body weight doses for 30 days. Results showed decreased body weight and a significant increase in liver and kidney relative weights in MAP-treated rats. In ad-dition, hematotoxicity effect of high doses of MPA was evidenced by decreased levels of red blood cells (RBC), haemoglobin (Hb) and hematocrit (Ht) along with increased levels of white blood cell (WBC) counts. Further, hepatic and renal markers and lipid profiles were markedly increased however; total pro-teins and albumin levels were considerably de-creased in MAP treated rats as compared with con-trols. These effects were supported by the liver and kidney histopathological evaluations. Conclusively, the study proved that the long-term use and at higher doses of MAP may cause adverse hepatic and renal effects
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    Effect of Peganum harmala L. extract supplemented ISP2 medium on growth and production of secondary metabolites of Streptomyces ayarius S115
    (Elsevier, 2022-12-22) Amel Nait Marzoug; Adel Ayari; Fadila Khaldi; Ines Guehria; Abdelhak Gheid
    Background: The present work aimed to investigate the effect of Peganum harmala L. in increasing the growth and production of secondary metabolites of Streptomyces ayarius strain S115 via ISP2 culture medium. Peganum harmala L. was dried and added to ISP2 medium. The morphological properties and the antibacterial activity of S. ayarius strain S115 seeded in ISP2 and the modified ISP2 media was evaluated by using the agar well diffusion method against five pathogenic bacteria, Escherichia coli Klebsiella pneumoniae, Pseudomonas aeruginosa, Serratia sp. and Methicillin-Resistant Staphylococcus aureus. The biomass of S. ayarius strain S115 in both media was determined. The kinetics of growth and production of secondary metabolites were studied for 7 d in different carbon sources. Results: Culture on the modified ISP2 showed an effective growth of S. ayarius strain S115 with changed color of the aerial mycelium from gray to white. The antibacterial activity revealed large inhibition zones against the tested pathogenic bacteria compared to those of the ISP2. The amount of S. ayarius strain S115 biomass was twice as high in the modified ISP2. The effect of different carbon sources on the growth and production of secondary metabolites of S. ayarius strain S115 revealed the highest biomass and biological activities through using glucose in the modified ISP2 on the 3rd day of culture. Of note, glycerol was found as the optimal carbon source in ISP2.
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    Antioxidant and Anticholinesterase Effects of Methanol Extract, And Consecutive Fractions of Peganum harmala L.
    (Egyptian Journal of Chemistry, 2022-10-29) Amel NAIT MARZOUG; Fadila KHALDI; Adel AYARI; Lynda GALI; Abdelhak GHEID
    Peganum harmala L. is a medicinal plant growing in the region of Sidi Fredj of Souk Ahras city (Northeastern of Algeria), whose native populations commonly used this plant to treat various health conditions and illnesses. Up to now, no previous study on the beneficial effects of P.harmala in the Souk Ahras region has been conducted. Therefore, the present study aimed to investigate the phenolic and flavonoid composition, as well as the antioxidant activities of the methanol extract and its three fractions: chloroform, ethyl acetate and butanol from seeds of P. harmala using eight different methods. The inhibitory effect of the extracts against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) was also determined. The results showed that the ethyl acetate fraction contained the highest amounts of total phenolic and total flavonoid (237.23±1.06 μg GAE/mg and 82.58±0.03 μg QE/mg, respectively). Important antioxidant activity was exerted by the extracts, especially the ethyl acetate fraction, which was the most effective. However, a weak antioxidant activity in Ferrous ions chelation was observed for all extracts with >800 μg/mL. The samples showed also a strong inhibitory effect against AChE and BChE, the chloroform fraction was the most potent with IC50 values of 14.69±0.10 μg/mL against AChE and 7.36±0.77 μg/mL against BChE comparable to that of galantamine. Conclusively, the obtained results proved the beneficial antioxidant and anticholinesterase activities of P. harmala-derived bioactive molecules.