M. BENREZGUA Elhadj

MCA

Directory of teachers

Department

Departement of Nature and life sciences

Research Interests

Specialized in Departement of Nature and life sciences. Focused on academic and scientific development.

Contact Info

University of M'Sila, Algeria

Email : elhadj.benrezgua@univ-msila.dz

On the Web:

  • Google Scholar N/A
  • ResearchGate
    ResearchGate N/A
  • ORCID N/A
  • SC
    Scopus N/A

Recent Publications

2025-02-01

Synthesis of low-content Mn-doped ZnO thin films: Characterizations and density functional theory studies

This study aims to prepare manganese-doped zinc oxide (MZO) thin films with low Mn content (x = 0, 2, 4 %) using the sol–gel spin coating method and to characterize their structural, optical, and magnetic properties. Experimental techniques were complemented by Density Functional Theory calculations with Hubbard correction (DFT-LDA + U). All films exhibit a polycrystalline wurtzite hexagonal phase of ZnO. As the Mn doping increases, all diffraction peaks are getting weaker, which leads to deterioration in the crystallinity of the samples. Furthermore, Mn doping affects the grain size (57.44–38.20 nm), the surface morphology (rms: 45.24–30.47 nm), the transmittance (93–54 %) and the optical band gap energy (Eg: 3.27–3.18 eV). Photoluminescence spectra reveals ultraviolet peaks (386–395 nm) along with weak green (525 nm) and strong (438 nm) and weak (475 nm) blue peaks. DFT-LDA + U calculations exhibits an antiferromagnetic phase with slightly reduced Eg (3.379 eV for x = 0 % and 3.267 for 3.7 %), attributed to the influence of Mn3d states near the Fermi level. This study presents a comprehensive analysis of low-content Mn-doped ZnO thin films by combining experimental and theoretical approaches. The findings provide valuable insights into the electronic, structural, optical, and magnetic properties of MZO, emphasizing the critical role of Mn 3d states in altering the magnetic behavior and adjusting Eg.
Citation

M. BENREZGUA Elhadj, Abdelhalim Zoukel, Ahmad Azmin Mohamad, , (2025-02-01), "Synthesis of low-content Mn-doped ZnO thin films: Characterizations and density functional theory studies", [national] Inorganic Chemistry Communications , Elsevier, Science Direct

Read Full Paper
2024-11-13

Study of the Physical Properties of Nickel oxide Thin Films : Effect of Lower Molarity

The sol-gel spin coating method was effectively used to deposit nickel oxide (NiO) thin films onto glass substrates using nickel acetate tetrahydrate as a precursor. The films were prepared with different concentrations (0.2 M ,0.3 M and 0.4M) and annealed at 450°C for 1.5 hours in air. Structural analysis via X-ray diffraction (Fig.01) shown that all films exhibited crystallization in the cubic phase, with preferred orientation toward (200) plane a-plane, at the angle 43.3 °. The crystallite size increases when increasing the concentration . Similarly, other structural parameters of the nanoparticles such as dislocation density (δ), micro-strain (ε) and decreased with increasing molar concentration as shown in Table 1. The investigation of the absorption spectra on the UV-visible region shows that the transparency of the films decreases in the visible region. Using tauc’s method , the band gap energy was estimated. We observe a slightly wider band gap when increasing the concentration . Eg values varies from 3.72 eV to 3.83 eV. (Fig3).
Citation

M. BENREZGUA Elhadj, (2024-11-13), "Study of the Physical Properties of Nickel oxide Thin Films : Effect of Lower Molarity", [international] 1st International Seminar on Mechatronics Innovation Materials, Renewable Energy and Artificial Intelligence (ISMIMREAI’24), , Tipaza, Algeria

Read Full Paper
2024-10-31

valorization of Agricultural Waste: Development of Bio Adsorbents from Date Peels for Wastewater Treatment

Water pollution is a major global challenge, causing severe repercussions for both the environment and human health.
Adsorption using bio-adsorbents is a promising method for removing these pollutants. This study focuses on the valorization of date peels, an agricultural waste, by developing activated carbon from these residues. The activated carbon was characterized by zero charge point (pH_pzc) measurements and Fourier transform infrared spectroscopy (FTIR) analysis. A series of experiments was conducted to evaluate he impact of contact time, pH, dosage, and temperature on adsorption capacity and process kinetics. The integration of nanometric materials into the design of these bio-adsorbents could enhance their efficiency and broaden their applications in wastewater treatment. The exploration of these new adsorbents, which are sustainable, economical, and easily accessible, is a priority for researchers seeking innovative solutions in this field.
Citation

M. BENREZGUA Elhadj, (2024-10-31), "valorization of Agricultural Waste: Development of Bio Adsorbents from Date Peels for Wastewater Treatment", [international] r'1 INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATIOl\ OF MA ERIALS (ICTAM'24) , Sétif

Read Full Paper

Investigating the Potential of Biochar-Activated Carbon Hybrids in the Treatment of Urban Sewage Sludge

Urban sewage sludge poses significant challenges for waste management due to its complex composition and potential environmental impacts. This study investigates the potential of biochar-activated carbon hybrids in the treatment of urban sewage sludge, focusing on its mineralogical characterization through X-ray diffraction (XRD) and X-ray fluorescence (XRF) techniques. These analytical methods reveal the elemental composition and structural properties of the sludge, highlighting the presence of key minerals that influence the characteristics of biochar derived from this material. Understanding these mineral phases allows for the optimization of biochar production processes, enhancing the performance of biochar-activated carbon hybrids in removing contaminants and improving nutrient retention. This research underscores the vital link between the characterization of urban sewage sludge and the development of innovative materials that support sustainable urban resource management.
Citation

M. BENREZGUA Elhadj, (2024-10-31), "Investigating the Potential of Biochar-Activated Carbon Hybrids in the Treatment of Urban Sewage Sludge", [international] The 1st International Conference on Technological Applications of Materials , Sétif

Read Full Paper

Yalorization of Agricultural Waste: Development of Bio­Adsorbents from Date Peels for Wastewater Treatment

Water pollution is a major global challenge, causing severe repercussions for both the environment and human health.
Adsorption using bio-adsorbents is a promising method for removing these pollutants. This study focuses on the valorization of date peels, an agricultural waste, by developing activated carbon from these residues. The activated carbon was characterized by zero charge point (pH_pzc) measurements and Fourier transform infrared spectroscopy (FTIR) analysis. A series of experiments was conducted to evaluate the impact of contact time, pH, dosage, and temperature on adsorption capacity and process kinetics. The integration of nanometric materials into the design of these bio-adsorbents could enhance their efficiency and broaden their applications in wastewater treatment. The exploration of these new adsorbents, which are sustainable, economical, and easily accessible, is a priority for researchers seeking innovative solutions in this field.
Citation

M. BENREZGUA Elhadj, (2024-10-31), "Yalorization of Agricultural Waste: Development of Bio­Adsorbents from Date Peels for Wastewater Treatment", [international] AT THE 1st INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATIOl\ OF MA ERIALS (ICTAM'24) , Ferhat Abbas University Seti fl -Faculty of Technology

Read Full Paper
2024-10-30

Rietveld refinement of natural phosphate using prof ex

Algerian natural phosphate minerals (N-PH) were processed through milling and subsequent
heat treatment, followed by thorough characterization. The resulting powders and samples
were analyzed using TG/DTA, XRD, FTIR, and FESEM techniques, with structural
refinement carried out via the Rietveld method. FESEM analysis showed morphological
changes from spherical to rod-like particles, attributed to sintering. Elemental analysis
confirmed the formation of fluorapatite. Rietveld refinement quantified the FAP phase,
showing 98.75% purity, and validated the hexagonal structure and arrangement of phosphate
and calcium ions.
Citation

M. BENREZGUA Elhadj, (2024-10-30), "Rietveld refinement of natural phosphate using prof ex", [international] AT THE 1ST INTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATION OF MATERIALS (JCTAM'24) , Ferhat Abbas University Seti fl -Faculty of Technology

Read Full Paper

Mn doped ZnO films: A comparative structural and optical properties study.

Mn doped ZnO thin films (MZO) with varying doping levels (x) were prepared using the sol-gel spin coating
method. All films exhibited a stable hexagonal polycrystalline wurtzite phase after doping. The surface morphology was
slightly altered, with a decrease in grain size [1]. The transmittance of the films reduced, and the optical band gap energy
(Eg) showed a slight decrease as Mn doping increased [2]. Additionally, the transparency of the films diminished due to
oxygen vacancies and increased grain boundary density. The UV absorption edge shifted to longer wavelengths with higher
Mn content, further reducing the band gap energy.
Citation

M. BENREZGUA Elhadj, (2024-10-30), "Mn doped ZnO films: A comparative structural and optical properties study.", [international] AT THE 1STINTERNATIONAL CONFERENCE ON TECHNOLOGICAL APPLICATION OF MATERIALS (JCTAM'24) , Ferhat Abbas University Seti fl -Faculty of Technology

Read Full Paper
2024-10-25

Low thickness effect on the properties of Mn-doped ZnO thin films synthesized by sol-gel spin coating technique

In this study, 7% manganese-doped zinc oxide (MZO) thin films with varying low thicknesses were synthesized using the spin coating method. The structural, optical, and morphological properties of MZO films with different film thickness, were systematically investigated. The crystallite structure, superficial morphology, and optical characteristics were analyzed using X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and ultraviolet–visible spectroscopy (UV-Vis). Structural analysis confirmed that all films exhibit a hexagonal wurtzite phase with a pronounced peak along the c-axis, and slight variation in low thickness significantly affected the structural parameters. The surface morphology demonstrated good uniformity, characterized by rounded grain shapes in the plane, while surface roughness was found to be increased with increasing film thickness. Optical analysis revealed that as the number of coatings increased, both transmittance and band gap energy decreased, accompanied by a redshift in the absorption edge across all samples. This behavior is attributed to light scattering, as well as an increase in the refractive index and dielectric function with visible light energy, influenced by the number of layers and corresponding crystallite size.
Citation

M. BENREZGUA Elhadj, (2024-10-25), "Low thickness effect on the properties of Mn-doped ZnO thin films synthesized by sol-gel spin coating technique", [national] Studies in Engineering and Exact Sciences , Elhadj Benrezgua

Read Full Paper
2024-10-14

Valorisation des pelures d'amandes en charbon actif pour l'épuration des eaux usées : Caractérisation et étude des capacités adsorbantes

La pollution des eaux est l'un des problèmes les plus répandus à l'échelle mondiale, entraînant des conséquences néfastes pour l'environnement et la santé humaine. L'adsorption par des bio-adsorbants représente l'une des méthodes les plus efficaces pour éliminer ces polluants. Ce travail vise à valoriser les déchets agricoles, notamment les pelures d'amandes, en développant un charbon actif à partir de ces résidus. Notre adsorbant a été caractérisé à l'aide de mesures du point de charge nulle (pH_pzc) et d'une analyse par spectroscopie infrarouge à transformée de Fourier (IRTF). Une série d'expériences a été conduite afin d'étudier l'impact du temps de contact, du pH, de la dose et de la température sur la capacité d'adsorption ainsi que sur la cinétique du processus. L'exploration de nouveaux adsorbants, naturellement abondants, faciles à collecter, économiques et disponibles en permanence, constitue un objectif majeur pour de nombreux chercheurs dans ce domaine.
Citation

M. BENREZGUA Elhadj, (2024-10-14), "Valorisation des pelures d'amandes en charbon actif pour l'épuration des eaux usées : Caractérisation et étude des capacités adsorbantes", [national] 1er Séminaire National : Eau, Environnement et Energies Renouvelables (SN3ER’2024) , M'sila

Read Full Paper
2024-10-13

Dans cette étude, nous avons utilisé la vermiculite sodique comme adsorbant d’un colorant azoique. Le polluant étudié c’est l’acide rouge ; plusieurs paramètres d’adsorption telle que le pH de la solution, temps de contact, dose d’adsorbant, concentration

Dans cette étude, nous avons utilisé la vermiculite sodique comme adsorbant d’un colorant azoique. Le polluant étudié c’est l’acide rouge ; plusieurs
paramètres d’adsorption telle que le pH de la solution, temps de contact, dose d’adsorbant, concentration initiale du colorant, la salinité ont été étudiés. Les
résultats de cette étude montre que le milieu acide est favorise mieux l’adsorption du colorant. L’étude cinétique montre que l’adsorption est rapide ou se
déroule ou bout d’une heure le système adsorbant-colorant atteint à l’équilibre. La dose optimale d’adsorbant est de 0,05g dans 50 ml de solution. D’après
les modélisations de isotherme d’adsorption le modèle Freundlich est le plus approprié. Ces résultats sont comparés avec une matériau hybride; St/argile . L’
étude cinétique montre que l’adsorption est rapide ou se déroule ou bout d’une heure le système adsorbant-colorant atteint à l’équilibre. La dose optimale
d’adsorbant est de 0,05g dans 25 ml de solution. D’après les modélisations de isotherme d’adsorption le modèle Freundlich est le plus approprié..
Citation

M. BENREZGUA Elhadj, (2024-10-13), "Dans cette étude, nous avons utilisé la vermiculite sodique comme adsorbant d’un colorant azoique. Le polluant étudié c’est l’acide rouge ; plusieurs paramètres d’adsorption telle que le pH de la solution, temps de contact, dose d’adsorbant, concentration", [national] 1er Seminaire National : Eau, Environnement et Energies renouvelables , Université Mohamed Boudiaf deM’Sila,

Read Full Paper
2024-05-06

Study of Structural and Optical Properties of Copper Oxide Thin Films Prepared by Sol–Gel Spin–Coating Method

This study investigates copper oxide thin films synthesized via the sol-gel method and deposited onto glass substrates using spin coating. The aim was to enhance their properties for photovoltaic applications through optimization of annealing temperature and precursor solution molar concentration. We examined the effects of annealing temperature on the structural and optical properties [1, 2] of the films. Notably, films treated at 450°C exhibited increased absorbance. Subsequently, employing this optimized temperature, CuO thin films of varying molar concentrations were deposited under the same conditions. Structural analysis via X-ray diffraction revealed a polycrystalline nature with a monoclinic crystal structure for all samples. Optical characterization using UV-Visible-NIR spectrophotometry indicated high absorbance in the visible region for the films.
Citation

M. BENREZGUA Elhadj, Chouia Rabah, , (2024-05-06), "Study of Structural and Optical Properties of Copper Oxide Thin Films Prepared by Sol–Gel Spin–Coating Method", [national] Le 2ème colloque national de chimie (CNC2@2024) 6 - 7 mai 2024 , Msila

Read Full Paper

Structural and Optical Properties of NiO Thin Films prepared by Sol-Gel Spin Coating Méthode : Effect of Precursor Concentration

The sol-gel spin coating method was effectively utilized to deposit nickel oxide (NiO) thin films onto glass substrates using nickel acetate tetrahydrate as a precursor. The films were prepared with different concentrations (0.7 M and 0.8 M) and annealed at 450°C for 1.5 hours in air. Structural analysis via X-ray diffraction (Fig.01) shown that all films exhibited crystallization in the cubic phase, with preferred orientation at (200) plane, to angles of 43.3°. The crystallite size decreased with 0.8 M compared to 0.7 M. However, the transparency of the films decreased in the visible region. The band gap energy is 3.72 eV for 0.7 M and 3.8 eV for 0.8 M (Fig3).
Citation

M. BENREZGUA Elhadj, (2024-05-06), "Structural and Optical Properties of NiO Thin Films prepared by Sol-Gel Spin Coating Méthode : Effect of Precursor Concentration", [national] Le 2ème colloque national de chimie (CNC2@2024) , Université Mohamed Boudiaf - M’sila

Read Full Paper
2024-02-13

Exploring The Structural, Optical, and Photoluminescence properties of Mn1-xZnOx Thin Films Deposited by Sol-Gel Spin Coating Technique

Pure and Mn-doped zinc oxide thin films at contents x =7% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have a wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping (Fig.1). The grain size decreased with 7% Mn doping (Table 1) while maintaining its growth mode The intensity of the (002) diffraction peak surpasses that of the other peaks, suggesting a preferential growth orientation along the c-axis owing to its minimal surface free energy among the (002) planes[1, 2], in addition, the results indicate a deterioration in the crystallinity of the ZnO film due to Mn incorporation".
From fig.2 the transparency of films was decreased in the visible region and the average transmittance of MnxZnO1-x films with Mn doping content x=0, and 7 %, are 93 and 54% in the visible range, respectively. The Eg values of MZO films (fig.3) with Mn doping content x=0.00, and 0.07, are 3.27, and 3.18 eV, respectively.
illustrates the PL spectra of ZnO and MZO thin films (Fig.4), at the excitation wavelength of 386 nm (3.21 eV). Several emission bands, including one violet emission (defect) at 411 nm (~3.01 eV), two blue emissions at 438/475 nm
Citation

M. BENREZGUA Elhadj, (2024-02-13), "Exploring The Structural, Optical, and Photoluminescence properties of Mn1-xZnOx Thin Films Deposited by Sol-Gel Spin Coating Technique", [national] THE “2 ND NATIONAL CONFERENCE ON MATERIALS, ENERGY & ENVIRONMENT , Tipaza, Algeria

Read Full Paper
2023-12-20

Structural. optical and photoluminescence Properties of pure ZnO and :Mn-Doped ZnO Thin Films Grown by Sol-Gel Spin Coating Deposition.

Pure and Mn-doped zinc oxide thin films at contents x =10% were synthesized by sol–gel spin coating process and investigated using various techniques. both samples have wurtzite hexagonal phase, which wasn’t altered and getting relaxed by Mn-doping. The grain size decreased and did not change its growth mode in 10%Mn doping. at x= 10 %, the transparency of films was decreased in the visible region and the band gap energy (Eg) presented a slight shrinking. Photoluminescence spectra showed ultraviolet with strong and weak blue and weak green emission peaks.
Citation

M. BENREZGUA Elhadj, (2023-12-20), "Structural. optical and photoluminescence Properties of pure ZnO and :Mn-Doped ZnO Thin Films Grown by Sol-Gel Spin Coating Deposition.", [national] THE FIRST NATIONAL CONFERENCE ON MATTER SCIENCES 􀀁cs,11023 (PresenLal and onJine) 20 DECEMBER 2023 DJELFA-ALGERIA , Djelfa

Read Full Paper
2023-11-24

Coprecipitation synthesis of transition metal (Al, Mn, Cu, Ag) doped zinc oxide nanopowders: characterization, photocatalytic test, and comparison study

The study successfully produced ZnO and ZnO nanoparticles doped with transition metals (TMZO-NPs) using the co-precipitation method. Various properties of these nanoparticles were examined, including their structure, morphology, electronic behavior, optical characteristics, vibrations, and photocatalytic abilities. The analysis confirmed that all nanoparticles possessed a hexagonal wurtzite crystalline structure, with particle size being influenced by the presence of transition metals (Al, Ag, Cu, Mn). The particles exhibited a preference for orientation along the (002) axis. The shift in peak positions towards higher angles suggested that the TM might replace Zn ions in the ZnO lattice. The surface structure of the nanoparticles displayed a combination of spherical and hexagonal shapes. Further analysis identified important bands related to the stretching modes of TM-O and Zn–O bonds. The absorption properties and edges were also affected by the presence of TM. In the degradation study, both pure ZnO and TMZO-NPs were tested for their ability to break down methylene blue (MB) under UV light exposure for 90 min. Among the nanoparticles, Al-doped ZnO (AlZO-NPs) demonstrated the highest degradation efficiency, achieving 97.14% removal of MB within the given exposure time. The photocatalytic process followed a pseudo-first-order kinetics, indicating a strong correlation. This suggests that AlZO-NPs hold promise as a material for use in photocatalytic applications.
Citation

M. BENREZGUA Elhadj, (2023-11-24), "Coprecipitation synthesis of transition metal (Al, Mn, Cu, Ag) doped zinc oxide nanopowders: characterization, photocatalytic test, and comparison study", [national] Journal of the Australian Ceramic Society , Rabie Amari

Read Full Paper
2023-08-16

Studies on photocatalytic performance applications of undoped and Al-doped ZnO nanoparticles

In the present study, transition metal Al-doped ZnO nanoparticles (TM-ZN NPs) were synthesized via the chemical co-precipitation method. The structural, morphological, electronic, optical, vibrational as well as the photocatalytic properties of the elaborated TMZO-NPs, are then investigated. Hexagonal wurtzite crystallinity of all elaborated NPs is confirmed by the phase analysis and particle size is found to be affected by TM doping. XRD peak shows that all samples prefer orientation along (002) axis and TM (Al) may substitute ZnO structure as the peaks
shift toward higher angles. The surface morphology of all samples exhibits mixture of spheroid-like and hexagon-like shaped structures. FTIR analyses are carried out to identify the important bands attributed to TM-O and Zn-O stretching vibration modes. The absorption intensity and edge are found affected by adding TM dopant. Degradation by pure ZnO and TMZO NPs of the methylene blue is investigated after 90 min UV light exposure. TM dopant affects the degradation of MB dye, where a high percentage (97.14%) being achieved after reasonable time of exposure
(90 min) under UV light for Aluminum doped ZnO nanoparticles (AlZO NPs).
Citation

M. BENREZGUA Elhadj, Siassi A, , (2023-08-16), "Studies on photocatalytic performance applications of undoped and Al-doped ZnO nanoparticles", [international] NANO-2023 , Bukovel, UKRAINE

Read Full Paper
← Back to Researchers List