Browsing by Author "Chinar, Tahani-achouak"

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    Removal Of Lead Ions Using A Cellulose Acetate/ Zeolite Composite Membrane And Their Analyzes By Inverse Voltammetry
    (Oum-El-Bouaghi University, 2017) Chinar, Tahani-achouak; Benbouzid, Mohammed; Benfarhi, Said
    Zeolitic faujasite Y type was prepared from the crystallization of the gel resulting from the combination of the solutions of silica and alumina. Its structure was characterized by XRD, SEM, BET, ATR-FTIR, and elementary analysis. The composite membranes were prepared from a biodegradable polymer “cellulose acetate” serving as a matrix and different percentages of the synthesized faujasite Y. The filtrates obtained were analyzed by inverse voltammetry. The results showed that the retention of lead ions increased with increasing faujasite Y concentrations, and indicated an adsorption capacity of more than 50 % for the lead ions.
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    Structural Phase, And Morphological Characterization Of A New Based On Oxide Ceramic Material
    (Oum-El-Bouaghi University, 2020) Aouragh, Abdellatif; Chinar, Tahani-achouak; Boutarfaia, Ahmed; Meklid, Abdelhek
    The main objective of this work is based on the synthesis, structural and physical characterization of a new ceramic material of PZT type and perovskite structure ABO3, We are interested in the study of the ternary system PbxCa1-x [(Mn1/3, Nb2/3) 0.06 (Mg1/3, Nb2/3) 0.06 (Zr0.50, Ti0.50) 0.88] O3 abbreviated PZT-CMMN with 0.95 ≤ x ≤ 0.98. A site substitution was carried out in order to improve its physical properties. The samples chosen for this study were prepared using solid synthesis methods. Heat treatment was applied to these compositions at different temperatures: 1100 ° C, 1150 ° C, 1180 ° C, 1200 ° C and 1230 ° C successive order , to optimize the sintering temperature .The product possess better physical properties when density of the materials are maximized.Such as: Scanning electron microscopy (SEM), X-ray diffraction (DRX), and IR analysis, have been carried out on the samples.
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    Theoretical study of the degradation of Amoxicillin by interaction with the hydroxyl radical (.OH)
    (Oum-El-Bouaghi University, 2021) Masmoudi, Rida; Khettaf, Sami; Kahlat, Chaimaa; Dibi, Ammar; Bouchekioua, Saad; Chinar, Tahani-achouak
    β-Lactam antibiotics are commonly used to avoid disease in humans, and antibiotics that have been excreted in the environment have caused significant concerns. Amoxicillin belongs to the penicillin, which is the most widely, consumed antibiotics that have resistance to conventional biological water treatment methods. The highest functional richness of this molecule makes it very difficult to establish the AMX degradation pathway. A better alternative to removing these toxic and recalcitrant compounds from wastewater effluents and causing their mineralization will be advanced oxidation processes (AOPs). They have emerged as a promising form of technology for pollutant degradation, converting them into safe products like CO2 and H2O. They’re oxidative processes based on the generation of highly oxidizing species like hydroxyl radicals. Our study uses functional density theory (DFT) to clarify the mechanisms of reactions between (OH.) and AMX. This interaction is done either by the abstraction of hydrogen or the addition of the radical hydroxyl on the molecule; the results reveal that the addition of radicals (OH.) that produce intermediates (add) is kinetically and thermodynamically favoured over the intermediate structures (abs) that are resulted from the abstraction of hydrogen. Thus, the Pkcsm server used to follows the toxicity study, which showed that amoxicillin/ion amoxicillin and their by-products. Could disrupt normal liver function and induce liver damage. they're toxic to the aqueous environment, where the AMX/ion AMX and their by-products obtained by the abstraction of an H+ are less toxic to Minnow fish than those obtained by the addition of OH (2.6 log mM),(3.9 log mM), respectively.
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    Zeolite Zsm-5 As A Filler For Pvc Membranes Used For The Removal Of Iron And Copper From Aqueous Solutions
    (Oum-El-Bouaghi University, 2018) Chinar, Tahani-achouak; Benbouzid, Mohammed; Benfarhi, Said
    In this study, a polyvinyl chloride (PVC) membrane impregnated with the zeolite ZSM-5 was used to remove Fe2+ and Cu2+ ions from aqueous solutions. The results obtained by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyzes indicated that the zeolite produced by the hydrothermal method was a pure porous material. The prepared zeolite was then incorporated into the PVC to obtain composite films which behave as filters. These composite membranes were used for the removal of metal ions contained in aqueous solutions. The filtrates obtained were analyzed by atomic absorption spectroscopy. The results showed the existence of a selective retention of metal ions according to their ionic radii. It increases with the ionic radii (RFe: 55 μm, RCu: 73 μm), and which increased in general with the concentration of the ZSM-5 zeolite .