Browsing by Author "Laouini Salah Eddine"

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Biosynthesis and characterization of Iron oxide nanoparticles by Mentha Pulegium .L leaf extract
(University Of Eloued جامعة الوادي, 2020-02-23) Bouafia, Abderrhmane; Laouini Salah Eddine
In this study, green synthesis of iron oxide nanoparticles was successfully prepared from Mentha Pulegium L leaves extract. The effect of different ferric chloride concentrations on the nanoparticles' iron oxide formation was studied. The obtained nanoparticles were characterized by UV-Vis, FT-IR, XRD, SEM and EDAX techniques are used for this purpose. UV-Vis spectra showed maximum absorption at range 275-301 nm related to the iron oxide. FTIR spectra exhibit a two weak peak at 510 and 594 cm-1 attributed to iron oxide NPs vibration, confirming the formation nanoparticles XRD confirmed the crystalline nature of Fe3O4 and α-Fe2O3 NPs with average size ranged in 22-34 nm.SEM showed that the green synthesizing Iron oxide nanoparticles having in general as cubical shape. As a result, the use of Mentha Pulegium L leaves extract offers its ease, fast, low cost and friendly to the environment compared to other methods.
Green synthesis of copper nanoparticles and Their Modification with Polyethylene Glycol to enhance photocatalytic activities
(University of Eloued, 2023-12-11) Iman Kir; Laouini Salah Eddine; Meneceur Souhaila
Synthesis using plant extracts is a simple, environmentally friendly and inexpensive method to prepare nanoparticles effective in photocatalytic applications. In this study, aqueous extract of lemon peel was used to synthesize copper oxide nanoparticles (NPs) and then the obtained copper oxide nanoparticles were modified with polyethylene glycol (PEG). The optical properties and photocatalytic activities of the synthesized nanoparticles were studied. CuO NPs and CuO/PEG NPs showed a ball-like morphology with average sizes of 34 nm and 45 nm and optical band gap energies of 1.2 eV and 1.5 eV, respectively. In photocatalytic activity tests, CuO/PEG NPs showed higher activity compared to CuO NPs alone. They achieved degradation rates of 99.7% for 4-bromophenol dye (BP) and 99.5% for toluidine blue dye (TP) after 90 min, while CuO NPs achieved slightly lower rates. CuO NPs and CuO/PEG NPs showed significant photodegradation activity against amoxicillin (an antibiotic), with degradation rates of 91% and 98%, respectively, after 120 min. The reaction kinetics of CuO/PEG NPs and CuO NPs followed a pseudo-order model, with CuO/PEG NPs showing a higher rate constant than CuO NPs. Overall, modification of CuO NPs with PEG showed excellent photocatalytic properties for environmental remediation, indicating their potential use in wastewater treatment and therapeutic applications
Green synthesis of copper nanoparticles and Their Modification with Polyethylene Glycol to enhance photocatalytic activities
(University of Eloued, 2023-12-11) Iman Kir; Laouini Salah Eddine; Meneceur Souhaila
Synthesis using plant extracts is a simple, environmentally friendly and inexpensive method to prepare nanoparticles effective in photocatalytic applications. In this study, aqueous extract of lemon peel was used to synthesize copper oxide nanoparticles (NPs) and then the obtained copper oxide nanoparticles were modified with polyethylene glycol (PEG). The optical properties and photocatalytic activities of the synthesized nanoparticles were studied. CuO NPs and CuO/PEG NPs showed a ball-like morphology with average sizes of 34 nm and 45 nm and optical band gap energies of 1.2 eV and 1.5 eV, respectively. In photocatalytic activity tests, CuO/PEG NPs showed higher activity compared to CuO NPs alone. They achieved degradation rates of 99.7% for 4-bromophenol dye (BP) and 99.5% for toluidine blue dye (TP) after 90 min, while CuO NPs achieved slightly lower rates. CuO NPs and CuO/PEG NPs showed significant photodegradation activity against amoxicillin (an antibiotic), with degradation rates of 91% and 98%, respectively, after 120 min. The reaction kinetics of CuO/PEG NPs and CuO NPs followed a pseudo-order model, with CuO/PEG NPs showing a higher rate constant than CuO NPs. Overall, modification of CuO NPs with PEG showed excellent photocatalytic properties for environmental remediation, indicating their potential use in wastewater treatment and therapeutic applications
Préparation et caractérisation de Cu2O nanoparticule par l’extrait des feuilles de Phoenix Dactylifera L
(University of Eloued, 2019-02-24) Berra Djamila; Laouini Salah Eddine; Ouahrani. Mohammed Ridha
Les nanotechnologies représentent aujourd’hui un domaine scientifique et technique en plein essor. Elles sont en voie de constituer le cœur de la prochaine révolution industrielle. Ces dernières années, la synthèse verte des nanoparticules métalliques (NPs) a attiré une attention considérable parce que ces protocoles sont peu coûteux et plus respectueux de l'environnement que les méthodes de synthèse standard. Dans ce travail, nous rapportons une méthode simple pour la synthèse de NPs de cuivre en utilisant l'extrait de Phoenix Dactylifera L comme bio réducteur. Les NPs de cuivre ainsi préparés ont été caractérisés en utilisant la spectroscopie ultraviolette-visible, la diffraction des rayons X, la spectroscopie infrarouge à transformée de Fourier et microscopie électronique à balayage .En effet, l'UV-Vis montre une absorption maximale à 275 nm liée à l'oxyde de cuivre. En outre, Les spectres FT-IR présentent un faible pic à 554 cm-1 attribué aux vibrations de Cu2O, confirmant la formation de nanoparticules de cuivre. DRX et MEB ont confirmé la nature cristalline, la forme sphérique d’oxyde de cuivre avec une taille de 23nm