Browsing by Author "Moussiden, Anissa"

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Etude cinétique et optimisation de la dégradation de pesticide organophosphoré type méthyl parathion par réaction d'hydrolyse
(2015) Moussiden, Anissa
Les composés organophosphorés (OP) forment une très vaste famille au sein de laquelle il est de coutume de différencier les neurotoxiques de guerre (NOP) et les pesticides (OPP) utilisés principalement come insecticides. Ces derniers sont très toxiques et présentent comme point commun d'inhiber l'acétylcholinestérase (AChE). Il est de ce fait absolument nécessaire de disposer de moyens visant à leur neutralisation. A cet égard, l'étude réalisée dans le cadre de ce travail de recherche consiste à la décontamination par réaction d'hydrolyse du composé organophosphoré considéré comme modèle potentiel des neurotoxiques.Dans la première partie, l'étude de la dégradation de pesticide organophosphoré type méthylparathion au moyen d'une solution décontaminante à base d'alcanolamine nous a permis d'évaluer l'influence de certains paramètres tels que le pH et la température. Le suivi cinétique de la réaction d'hydrolyse est réalisé par l'analyse UV-visible. Ainsi, l'identification des produits dégradation du MP en milieu basique a été réalisée par GC/MS. Le principal produit d'hydrolyse du méthylparathion est le p-nitrophénol.Dans la seconde, l'optimisation de la réaction de dégradation du pesticide organophosphoré par hydrolyse par la méthodologie des surfaces de réponses (RSM) a été réalisée. L'analyse de la variance (ANOVA) a montré une valeur élevée du coefficient de détermination (R2=0.997), ce qui montre qu'un ajustement satisfaisant est assuré par le modèle de régression de second ordre entre les données expérimentales et prédites
Hydrolytic decontamination of methyl parathion in the presence of 2-aminoethanol : kinetics study
(Pesticide Science Society of Japan, 2018) Doumandji, Lotfi; Moussiden, Anissa; Ihdene, Zaher; Hamada, Boudjema
One-step synthesis and characterization of carbon nanospheres via natural gas condensate pyrolysis
(Taylor and Francis, 2020) Boufades, Djamila; Hammadou Née Mesdour, Souad; Moussiden, Anissa; Benmebrouka, Hafsa; Hérold, Claire; Kaddour, Omar
In the current work, carbon nanospheres (CNSs) were prepared via pyrolysis of gas condensate in N2 at 1273 K and atmospheric pressure for 2 h using ferric chloride as a catalyst precursor. X-ray diffraction, energy dispersive X-ray spectrometry (EDX) in scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectrometry (Raman), Fourier transform infrared spectroscopy, and thermal gravimetric analysis (TGA) are employed for the structural and morphological characterization of the nanomaterials formed. The conductivity of these films was measured using the four probe method. As results, SEM-EDX and TEM analysis reveal spherical shaped particles, with diameter varying between 100 and 200 nm and graphene interlayer distance of 0.339 nm. The very low ID/IG ratio obtained reveals a relatively low amount of disorder in the nanostructures and TGA analysis implies that thermal stability was achieved after 470 °C. Our work provides a simple synthetic strategy in one-step sample preparation of CNSs, which can be used for furfur applications such as high-performance supercapacitors or adsorbents
Optimization of hydrolysis degradation of neurotoxic pesticide methylparathion using a response surface methodology ( RSM )
(IOSR Journal of Applied Chemistry (IOSR - JAC), 2015) Doumandji, Lotfi; Moussiden, Anissa; Benmabrouka, Hafsa; Boufades, Djamila; Zaher, Ihdene; PemanosYelda, Bakos; Hamada, Boudjema
Optimization of carbon nanotubes synthesis via pyrolysis over Ni/Al2O3 using response surface methodology
(Taylor and Francis Online, 2021) Boufades, Djamila; Hammadou Née Mesdour, Souad; Moussiden, Anissa; Benmebrouka, Hafsa; Medjahdi, Ghouti; Kaddour, Omar
Owing to the rapid expansion of preparing a low-cost and pure carbon nanotubes (CNTs) from large available raw materials as cheap carbon precursors and catalyst depositions via chemical vapor deposition process, Algerian condensate gas over Ni/Al2O3 was used in this study. Response surface methodology was utilized to assess and optimize the preparation parameters. Synthesis of CNTs was studied as a function of three independent parameters: catalyst/condensate-gas weight ratio (5–10 wt %), synthesis time (30-120 min) and temperature (700–1000 C). Optimum conditions for the CNTS-synthesis were found to be 5%, 112 min and 1000 C, for catalyst/condensate gas mass ratio, synthesis time and temperature, respectively. Under these conditions, Raman spectrum indicates high values of (IG/ID), which means high-quality CNTs. Examination by SEM and HRTEM revealed that the CNTs grown under optimum conditions had diameters of 10nm. The carbon yield predicted at the optimum process conditions was 81.76%. Conclusively, the pure and uniformed CNTs can be produced with high yield by the conversion of available-cheap resources via CVD-method. This method is practical, realistic, feasible in industrial scale and thus can reduces the cost manufacture of CNTs, which may help increase the impact of these remarkable materials in many fields.
Process Parameters and Intensification Effects of a Microwave Exposure Applied for the Extractive Oxidation of Diesel: An Optimization Using Response Surface Methodology
(Pleiades Publishing, 2024) Bedoud, Karim; Mesdour, Souad Hammadou née; Boufades, Djamila; Moussiden, Anissa; Benmabrouka, Hafsa; Hamada, Boudjema; Kaddour, Omar
Extractive oxidation of diesel via microwave processing using sulfuric acid and two synthesized pyridinium- or methylpyridinium-based ionic liquids has been studied as a sustainable and clean technology. The Central Composite Design (CCD) representing one of the response surface methods was applied for the experimental design, mathematical modeling, optimization, and factor-influence study, which covered the 0.75–1.75 [CH2COOHmPy][HSO4]/[H2SO4] volumetric range, 40–80°C temperature range, and 120–300 s radiation exposure time. The developed model properly fitted experimental results, with a coefficient of determination (R2) equal to 0.9832 that indicated its accuracy. The highest predicted sulfur removal (93.338%) as well as a significant removal of nitrogen and aromatic compounds was obtained for [CH2COOHmPy][HSO4]/[H2SO4] = 1.57, T = 71.7°C, and exposure time equal to 208 s. Microwave-assisted extractive oxidation demonstrated a considerable potential as the energy-saving technology, which meets the future need for producing clean fuels with low content of heteroatoms and polyaromatic hydrocarbons.
Synthesis and functionalization of carbon nanospheres from asphaltene fraction for crude oil upgrading and viscosity reduction
(Taylor & Francis, 2024) Hammadou, Souad; Boufades, Djamila; Dahou, Meriem; Moussiden, Anissa; Boussak, Hassina; Demim, Soraya; Loucif Seiad, Linda
Nanoparticles provide a promising, cost-effective eco-friendly solution to the challenges posed by heavy-oil reservoirs, significantly enhancing oil recovery rates by reducing viscosity without requiring extensive thermal inputs. In this study, carbon nanospheres (CNSs) and functionalized-CNSs nanofluids were prepared by incorporating surfactants (T80 or BMIMCl). These nanofluids were evaluated for their efficacy in upgrading crude oil, particularly focusing on viscosity-reduction. Rheological tests were conducted across varying shear rates (60–300 s−1) and concentrations (0.02–3 wt.%) to comprehensively assess the impact of these additives on the crude oil’s proprieties. The results showed a notable enhancement in crude oil viscosity reduction, with the following order observed: CNS-TiO2 < CNS-TiO2/DMIMCl < CNS-TiO2/T80, yielding reduction rates of 95%, 95.83%, and 97.08%, respectively, at an optimal dosage of 2.75 wt.% and a shear rate of 300 s−1. The surface functionalization of CNS particles and their crystallinity are the main mechanisms driving the reduction in oil viscosity. Moreover, the properties of the crude oil were investigated upon the utilization of CNS-TiO2/T80 nanofluid. It was found that this nanofluid led to a substantial reduction in sulfur content by 78.32% and a significant decrease in the percentage of heavier molecules, ranging from C12 to C35 and up to C36, with 47.76% and 97.98%, respectively.
Vanadium-catalyzed extractive oxidesulfurization of commercial diesel in ionic liquid with combined oxidizing agents
(Taylor & Francis, 2019) Benmabrouka, Hafsa; Mesdour, Souad; Boufades, Djamila; Moussiden, Anissa; Berrabia, Nadjet; Tliba, Louey; Boudjema, Hamada