Browsing by Author "Aoudjit, Lamine"

Now showing 1 - 4 of 4

Efficient solar heterogeneous photocatalytic degradation of metronidazole using heterojunction semiconductors hybrid nanocomposite, layered double hydroxides
(2020) Aoudjit, Farid; Touahra, Fouzia; Aoudjit, Lamine; Cherifi, Ouiza; Halliche, Djamila
This study focuses on the synthesis of various nanocomposites with heterojunction structures, MgAl-LDH (LDH = layered double hydroxides) hybrid with semiconductor such as MoO3 and CuO. These solids were synthesized by co-precipitation method at constant pH and have been characterized extensively using atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and transmission electron microscopy-energy dispersive X-ray (TEM-EDX) methods. The catalytic activity of nanocomposites was tested in the photocatalytic degradation under solar irradiation of emerging pollutants as the pharmaceutical metronidazole (MNZ). The experimental parameters, including initial MNZ concentration, the nature of oxide incorporate in the photocatalyst, catalyst loading were explored. All the synthesized samples showed high photocatalytic performances; the highest photocatalysis efficiency was achieved with the photocatalyst dose 1.5 g/L and initial MNZ concentration of 10 mg/L at neutral pH. The photocatalytic experimental results were fitted very well to the Langmuir-Hinshelwood model. From the obtained results the calcined LDH/semiconductors could be efficient for the photocatalytic process under solar irradiation of pharmaceuticals and may contribute in environmental remediation
Electrochemical Deposition of Hematite α-Fe2O3 Thin Films for Photo-Current Generation Application
(Pleiades Publishing, 2024) Mokhtari, S.; Bouhdjer, Lazhar; Dokhan, Nahed; Aoudjit, Lamine; Imma, H.; Omeiri, Said; Trari, Mohamed
In the field of sustainable hydrogen production, hematite (α-Fe2O3) is a promising material owing to its optical band gap and water oxidation/reduction energies. In this context, the main objective of this work is devoted to the synthesis of α-Fe2O3 by electrochemical anodization of iron sheet using two anodization voltages (20 and 30 V), followed by annealing at 450°C (1.5 h) in air. Indeed, annealing is a necessary but not sufficient condition for the hematite prepared electrochemically. Furthermore, we discuss the effect of anodizing voltage and analyze its influence on the properties of the films namely structural, morphological, optical, electrochemical and photoelectrochemical (PEC) properties. The annealed Fe2O3 sample, anodized at 30 V, demonstrates a net photocurrent density of 0.81 mA/cm2 at 0.744 VRHE in KOH (1 M). The obtained results indicate that the α-hematite thin films synthesized by anodization technique under optimized conditions is a promising photoanode in PEC cells.
Hydrothermally synthesized reduced graphene Oxide-Copper sulfide nanomaterial for application as supercapacitor
(Pleiades Publishing, 2023) Mokhtari, S.; Dokhan, Nahed; Aoudjit, Lamine; Trari, Mohamed; Omeiri, Said
This work is dedicated to the synthesis of rGO-CuS (reduced graphene oxide-copper sulfide) nanocomposites through a low-cost and environmentally friendly method through a one-step hydrothermal low-temperature process without the use of surfactants. rGO was obtained by efficient reduction of GO with PEI (polyethylenimine), identified by XRD, and confirmed by FTIR, Raman, and XPS analyses. The XRD pattern shows the formation of CuS phase crystallized in a hexagonal structure, while the SEM image shows the growth of CuS nanocrystals on the rGO layer. TEM showed the formation of spherical CuS nanoparticles distributed on the rGO surface. When studying its electrochemical reaction, the synthesized nanocomposite exhibited pseudocapacitive behavior with a specific capacitance of 418 F g –1 .
Reduction of 4-Nitrophenol and Adsorption of Rhodamine B Using Reduced Graphene Oxide-Copper Sulfide Nanomaterial
(Pleiades Publishing, 2024) Mokhtari, S.; Aoudjit, Lamine; Ben Hariz, S. Habi; Dokhan, Nahed; Trari, Mohamed
Polyethylene imine (PEI) is used as an effective chemical agent for the reduction of graphene oxide (GO) to reduced graphene oxide (rGO). It is water-soluble, stable and cost-effective, and the reaction condition is easily achievable. The rGO nanocomposite are decorated with CuS nanoparticles by a single-step hydrothermal method. GO is assisted by precursors of Cu2+ and S2– in well-defined ratios. Several analysis methods are used such as UV–Vis, FTIR, XRD with SEM coupled with EDS to develop the structure and morphology of synthesized rGO-CuS nanocomposites. GO is assisted by Cu2+ and S2– precursors in well-defined ratios. Several analysis methods are used such as UV–Vis spectrophotometry, FTIR spectroscopy, X‑ray diffraction (XRD) and scanning electron microscopy (SEM) for the structural and morphological characterizations of the synthesized rGO-CuS nanocomposites. The structural and optical properties are discussed and the results obtained are compared to the literature. The prepared material has been tested in various applications, it is used as a Calisher for the reduction of 4-nitrophenol to 4-aminophenol and the degradation of Rhodamine B (Rh B).