Browsing by Author "Laouini, Salah Eddine"

Filter results by typing the first few letters
Now showing 1 - 5 of 5
  • No Thumbnail Available
    Item
    Enhanced photocatalytic and antiviral activities of CuO@Fe2O3 NC for amoxicillin degradation and SARS-COV-2 treatment
    (University of Eloued جامعة الوادي, 2023-12-07) Laouini, Salah Eddine; Legmairi, Souheila; Meneceur, Souhaila; Hasan, Gamil Gamal; Hamdi, Ali Mohammed
    Copper oxide nanoparticles (CuO NPs) and CuO NPs decorated with hematite (Fe2O3) nanocomposites (CuO@Fe2O3 NC) were biosynthesized by a green method using Portulaca oleracea leaves extract. The NC were characterized using various techniques, including X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and UV-Vis spectroscopy. The results showed that the synthesized CuO and CuO@Fe2O3 NC were crystalline with a monoclinic crystal structure and contained functional groups responsible for catalytic activity. The size of the nanocomposites ranged from 39.5 to 45.9 nm, and they exhibited a variety of agglomerated or aggregated shapes. The CuO@Fe2O3 NC showed improved photocatalytic activity for the degradation of antibiotics in water and wastewater and promising antiviral activity against SARS-CoV-2, indicating its potential for use in disinfection applications. The study investigated the impact of irradiation time on the photocatalytic degradation of Amoxicillin and found that increasing the irradiation time led to a higher degradation rate. The band gap energy (Eg) for pure CuO NPs was around 2.4 eV and dropped to 1.6 eV with CuO@Fe2O3 NC. In summary, the CuO@Fe2O3 NC has the potential to be an efficient photocatalyst and promising antiviral agent for environmental remediation. The CuO@Fe2O3 nanocomposites have been found to possess a high degree of efficacy in inactivating SARS-CoV-2 infectivity. The results of the study indicate that the nanocomposites exhibit potent anti-viral properties and hold significant potential for use in mitigating the spread of the virus الملخص تم تصنيع الجسيمات النانوية لأكسيد النحاس (CuO NPs) وCuO NPs المزينة بمركبات نانوية من الهيماتيت (Fe2O3) (CuO@Fe2O3 NC) بطريقة خضراء باستخدام مستخلص أوراق Portulaca oleracea. تم تشخيص NC باستخدام تقنيات مختلفة، بما في ذلك حيود الأشعة السينية (XRD)، والتحليل الطيفي للأشعة تحت الحمراء (FTIR) لتحويل فورييه، والمجهر الإلكتروني الماسح (SEM)، والتحليل الطيفي للأشعة السينية المشتتة من الطاقة (EDS)، والتحليل الطيفي للأشعة فوق البنفسجية. أظهرت النتائج أن CuO وCuO@Fe2O3 NC المُصنّعين كانا بلوريين بتركيب بلوري أحادي الميل ويحتويان على مجموعات وظيفية مسؤولة عن النشاط التحفيزي. تراوح حجم المركبات النانوية من 39.5 إلى 45.9 نانومتر، وأظهرت مجموعة متنوعة من الأشكال المتكتلة أو المجمعة. أظهر CuO@Fe2O3 NC نشاط تحفيز ضوئي محسّن لتحلل المضادات الحيوية في الماء ومياه الصرف الصحي ونشاطًا واعدًا مضادًا للفيروسات ضد SARS-CoV-2، مما يشير إلى إمكانية استخدامه في تطبيقات التطهير. بحثت الدراسة في تأثير وقت التشعيع على التحلل الضوئي للأموكسيسيلين ووجدت أن زيادة وقت التشعيع أدى إلى ارتفاع معدل التحلل. كانت طاقة فجوة النطاق (على سبيل المثال) لـ CuO NPs النقية حوالي 2.4 فولت وانخفضت إلى 1.6 فولت مع CuO@Fe2O3 NC. باختصار، يتمتع CuO@Fe2O3 NC بالقدرة على أن يكون محفزًا ضوئيًا فعالًا وعاملًا واعدًا مضادًا للفيروسات للمعالجة البيئية. تم العثور على أن المركبات النانوية CuO@Fe2O3 تمتلك درجة عالية من الفعالية في تعطيل عدوى SARS-CoV-2. تشير نتائج الدراسة إلى أن المركبات النانوية تظهر خصائص قوية مضادة للفيروسات ولها إمكانات كبيرة للاستخدام في التخفيف من انتشار الفيروس
  • No Thumbnail Available
    Item
    Green synthesis and characterization of iron oxide nanoparticles by pheonix dactylifera leaf extract and evaluation of their antioxidant activity
    (Elsevier, 2020-09-01) Ahmed Abdullah, J Amin; Laouini, Salah Eddine; Bouafia, Abderrhmane; M, Alonso-González; A, Guerrero; A, Romero
    The development of green nanotechnology is generating research interest in the ecological biosynthesis of nanoparticles (NPs). In this study, the biosynthesis of stable iron nanoparticles was carried out using Phoenix dactylifera L. extract which is able to reduce iron ions to iron nanoparticles. The process comprises maceration extraction overnight and heat treatment of the extract with iron chloride (FeCl3) at 70 °C for 1 h. X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) were used for nanoparticle characterization. The stability of the bioreduced iron nanoparticle was analyzed using UV-VIS absorption spectra, and their antioxidant and anti-radical activities were measured against PhosPhoMolybdate (PPM) and 2,2-diphenyl-1-picryl-hydrazyl (DPPH), respectively. The results demonstrate that ecological biosynthesis of 2–30 nm stable iron nanoparticles of size with antioxidant activity can be achieved suggesting their possible applications.
  • No Thumbnail Available
    Item
    Green synthesis of iron oxide nanoparticles by aqueous leaves extract of Mentha Pulegium L.: Effect of ferric chloride concentration on the type of product
    (North-Holland, 2020-04-15) 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.
  • Thumbnail Image
    Item
    Green Synthesized of Ag/Ag2O Nanoparticles Using Aqueous Leaves Extracts of Phoenix dactylifera L. and Their Azo Dye Photodegradation
    (MDPI, 2021-06-25) Laouini, Salah Eddine; Bouafia, Abderrhmane; Soldatov, Alexander V
    In this study, silver/silver oxide nanoparticles (Ag/Ag2O NPs) were successfully biosynthesized using Phoenix dactylifera L. aqueous leaves extract. The effect of different plant extract/precursor contractions (volume ratio, v/v%) on Ag/Ag2O NP formation, their optical properties, and photocatalytic activity towards azo dye degradation, i.e., Congo red (CR) and methylene blue (MB), were investigated. X-ray diffraction confirmed the crystalline nature of Ag/Ag2O NPs with a crystallite size range from 28 to 39 nm. Scanning electron microscope images showed that the Ag/Ag2O NPs have an oval and spherical shape. UV–vis spectroscopy showed that Ag/Ag2O NPs have a direct bandgap of 2.07–2.86 eV and an indirect bandgap of 1.60–1.76 eV. Fourier transform infrared analysis suggests that the synthesized Ag/Ag2O NPs might be stabilized through the interactions of -OH and C=O groups in the carbohydrates, flavonoids, tannins, and phenolic acids present in Phoenix dactylifera L. Interestingly, the prepared Ag/Ag2O NPs showed high catalytic degradation activity for CR dye. The photocatalytic degradation of the azo dye was monitored spectrophotometrically in a wavelength range of 250–900 nm, and a high decolorization efficiency (84.50%) was obtained after 50 min of reaction. As a result, the use of Phoenix dactylifera L. aqueous leaves extract offers a cost-effective and eco-friendly method.
  • Thumbnail Image
    Item
    Preparation methods keratin and nanoparticles keratin from wool: a review
    (جامعة الوادي - university of el oued, 2020-07-05) Ben Seghir, , Bachir; Hemmami, Hadia; Zeghoud, Soumeia; Laouini, Salah Eddine; Rebiai, Abdelkrim; Ben Amor, Ilham; Souici, Imane; Beki, Ahlam
    Keratins are a group of fibrous proteins, These proteins are abundantly present in nature and constitute the major part of the hair, wool, horns, nails, feathers, and the stratum corneum of the skin. Among others, an ecological and economic point of view, recovery of many organic substances discharged into the effluent of textile mills is of prime importance. This thesis review certain physical and chemical characteristics of the keratin derived utilizing five processes of chemical extraction: reduction, hydrolysis, sulfitolysis, oxidation, and production. Since the keratin is a group of fibrous protein and has many useful applications. For example: In pharmaceutical industries, plastic production, biosorption, and tissue engineering. Considering this advantage, this work mainly concentrates on the nanoparticle keratin synthesis through different methods