Influence of agricultural residues on the formation of TiO2 phases: Real-time in situ X-ray diffraction monitoring in a reaction chamber Rodrigo P. Feitosa, Johar Amin Ahmed Abdullah, Ramón R. Peña-Garcia, Maria G. Fonseca, Edson C. Silva-Filho, Santiago Medina-Carrasco, Maria del Mar Orta Cuevas, Josy A. Osajima Chemical Engineering Journal, 2026 This study investigates the influence of agricultural residues on the structural evolution of titanium dioxide (TiO 2 ) synthesized through a green route using rice husk (C1), sugarcane bagasse (C2), and coconut husk (C3) ashes. Real-time in situ X-ray diffraction (XRD) was employed to monitor phase transitions during controlled heating up to 900 °C, enabling quantitative tracking of anatase–rutile transformation and crystallite growth by Rietveld refinement. At 800 °C, pure TiO 2 was predominantly rutile (≈94.3%) with only ≈5.7% anatase, whereas C1–TiO 2 and C2–TiO 2 retained ~50% anatase (49.7% and 51.0%, respectively), and C3–TiO 2 remained anatase-rich (70.1%) due to concurrent formation of priderite (27.8%) and ramsdellite (1.6%). The incorporation of siliceous ashes (C1 and C2) delayed rutile nucleation and reduced crystallite coarsening, indicating that SiO 2 and mineral components hinder atomic diffusion and stabilize anatase at higher temperatures. In contrast, coconut ash (C3) promoted the formation of secondary titanate phases (priderite and ramsdellite), leading to distinct multiphase kinetics. These results demonstrate that the chemical nature of agro-industrial ashes can be used to modulate TiO 2 microstructure and phase stability. The findings provide a quantitative framework for engineering sustainable TiO 2 materials, where the choice of agricultural residue enables control over anatase retention or rutile formation, with direct implications for photocatalytic and surface-active applications. • Sustainable valorization of agro-residues (rice, sugarcane, coconut) as TiO₂ structure modifiers. • Real-time in situ XRD tracks anatase→rutile transformation up to 900 °C with quantitative Rietveld analysis. • SiO₂-rich ashes delay rutile nucleation and suppress crystallite coarsening, stabilizing anatase at higher T. • K-rich coconut ash redirects crystallization to priderite/ramsdellite, enabling tunable multiphase TiO₂. • Provides actionable, sustainable calcination parameters to engineer TiO₂ phase composition for green applications.
An eco-responsible approach to the synthesis of AgFeO2 nanocomposite via Portulaca oleracea: Towards improved chlorpyrifos photocatalysis and antibacterial properties Djamel Barani, Salah Eddine Laouini, Abderrhmane Bouafia, Hamdi Ali Mohammed, Mohammed Sadok Mahboub, Mahmood M. S. Abdullah, Abdeldjalil Laouini, Johar Amin Ahmed Abdullah Environmental Progress and Sustainable Energy, 2026 This study reports the eco‐friendly synthesis of AgFeO 2 nanocomposite (NC) using Portulaca oleracea L. leaf extract as a natural reducing and stabilizing agent. The NCs, characterized by UV–Vis spectroscopy, FTIR, XRD, and SEM, exhibited a rhombohedral crystal structure (JCPDS Card No. 01‐075‐2147) with high phase purity, a crystallite size of 24.46 ± 3.74 nm, and spherical to quasi‐spherical particles (30–100 nm, mean 55–60 nm). Optical analysis revealed a direct bandgap of 1.53 eV and strong absorption at 440 nm, underscoring their photocatalytic potential. The NCs achieved 99.5% degradation of chlorpyrifos (80) within 90 min under solar irradiation, following pseudo‐first‐order kinetics (k = 0.051 min −1 ) driven by reactive oxygen species. Antibacterial assays demonstrated dose‐dependent inhibition against Staphylococcus aureus , Pseudomonas aeruginosa , Bacillus subtilis , Klebsiella pneumoniae , and Escherichia coli , with inhibition zones of 8.5 ± 0.70 mm to 18.5 ± 0.70 mm at 250–1000 μg·mL −1 , rivaling ciprofloxacin. FTIR confirmed the removal of organic residues post‐calcination, ensuring structural integrity. These findings position the AgFeO 2 NC as a versatile, sustainable platform for photocatalytic pollutant degradation and microbial control in environmental and biomedical applications.
MgO and MgO/char nanocomposites as efficient catalysts for the removal of thiophene and malachite green from aqueous systems Abdelmadjid Guerram, Bilal Khaled, Salah Eddine Laouini, Abderrahmane Bouafia, Ilham Ben Amor, Djamel Barani, Imen Zaghbib, Mahmood M. S. Abdullah, Hamad A. Al-Lohedan, Johar Amin Ahmed Abdullah Journal of Sol Gel Science and Technology, 2026 MgO nanoparticles were synthesized by precipitation-calcination: 0.1 M Mg(NO₃)₂·6H₂O was precipitated with 0.5 M NaOH to pH 10–11, aged for 2 h, washed, dried at 100 °C, and calcined at 450 °C for 3 h. The MgO/char nanocomposite was fabricated by ultrasonically dispersing biomass-derived activated carbon (0.5 g in 100 mL water for 30 min), adding pre-synthesized MgO nanoparticles, stirring, aging for 2 h, washing, and drying at 100 °C. Analytical-grade chemicals and deionized water were used. Materials were characterized by UV–Vis (band-edge absorption at ~307 nm), FTIR, XRD (cubic periclase MgO; crystallite sizes 9.71 ± 1.39 nm for pure MgO and 19.95 ± 1.60 nm for composite), XPS (O 1 s: 530.10 eV in MgO vs. 531.58 eV in composite; Mg 2p: 51.08 eV vs. 52.30 eV), SEM (reduced aggregation in composite), and EDX (confirmed Mg, O, and C presence). Photocatalytic tests under simulated sunlight (0.05 g catalyst in 100 mL pollutant solution) showed thiophene degradation of 99.24% (MgO) and 100% (composite) in 90 min. Malachite green degradation reached 99.91% (MgO) but only 88.92% (composite) in 140 min, reflecting adsorption dominance in the composite. Experiments were triplicated with mean ± standard deviation reported.
Synthesis and Characterization of Amoxicillin-Functionalized Ag/AgCl Nanoparticles: A Promising Multifunctional Platform for Next-Generation Nanomedicine Salah Eddine Laouini, Abderrhmane Bouafia, Manel Azzi, Ibtissam Laib, Mamoun Fellah, Mahmood M. S. Abdullah, Hamad A. Al‐Lohedan, Johar Amin Ahmed Abdullah Journal of Biomedical Materials Research Part B Applied Biomaterials, 2025 This study synthesized and characterized amoxicillin‐functionalized Ag/AgCl nanoparticles (Amoxicillin@Ag/AgCl NPs) for biomedical applications. The nanoparticles were prepared via a coprecipitation method and functionalized with amoxicillin to enhance therapeutic potential. Characterization techniques (X‐ray diffraction [XRD], Fourier‐transform infrared (FTIR), scanning electron microscopy [SEM], and UV–Vis) confirmed successful functionalization and improved physicochemical properties. The crystallite size increased from 17.29 ± 3.44 to 20.47 ± 4.17 nm, while the bandgap widened from 2.33 to 2.40 eV, indicating enhanced electronic interactions. Antioxidant activity was significantly improved, with 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulfonic acid) (ABTS) radical scavenging reaching 97.87% and β‐carotene bleaching inhibition at 95.47% (175 μg/mL). The antibiofilm efficacy was notable, with inhibition rates of 90.24% for E. coli (250 μg/mL), 81.47% for S. typhimurium (175 μg/mL), and 87.68% for B. subtilis (250 μg/mL). In enzymatic inhibition studies, Amoxicillin@Ag/AgCl NPs showed neuroprotective potential, inhibiting acetylcholinesterase (AChE) (93.74% at 160 μg/mL) and butyrylcholinesterase (BChE) (97.41% at 80 μg/mL), highlighting their potential in Alzheimer's treatment. Additionally, they exhibited anti‐inflammatory effects, inhibiting lipoxygenase (LOX) by 90.47% (120 μg/mL). To the best of our knowledge, this is the first report on the synthesis of Amoxicillin@Ag/AgCl NPs that simultaneously demonstrate strong antioxidant, antibiofilm, neuroprotective, and anti‐inflammatory properties, underscoring their novelty as next‐generation nanomedicines.
Comprehensive Bioactivities and Phytochemical Profiling of Rumex vesicarius: Antioxidant Potential, Anti-Diabetic Properties, and Anti-Biofilm Effects Under Thermal Treatment Abderrhmane Bouafia, Ibtissam Laib, Salah Eddine Laouini, Manel Azzi, Fahad Alharthi, Abdullah Al Souwaileh, Johar Amin Ahmed Abdullah Chemistry and Biodiversity, 2025 This study investigates the effect of thermal treatment on the phytochemical composition and bioactivities of Rumex vesicarius, focusing on its antioxidant, antidiabetic, and anti‐biofilm properties. Quantitative analysis showed that at ambient temperature, the extract had the highest phenolics (57.89 mg GAE/g), flavonoids (19.45 mg QE/g), tannins (12.78 mg CE/g), flavonols (6.48 mg), and anthraquinones (2.078 mg). At 60°C, it retained significant phenolics (52.89 mg GAE/g) and flavonoids (18.45 mg QE/g) with minimal degradation. At 90°C, phenolics decreased slightly (43.59 mg GAE/g), but enzymatic inhibition and antimicrobial properties improved. β‐Carotene stability varied, with untreated extract at a minimum inhibitory concentration (IC50) of 118.136 µg/mL. Peak antioxidant activity was at 150°C (IC50 = 102.77 µg/mL), with degradation above 150°C. Antidiabetic potential, via α‐amylase and α‐glucosidase inhibition, showed the lowest IC50 values (92.106 µg/mL for both) at 90°C. Beyond 120°C, IC50 rose to 268.35 µg/mL (α‐amylase) and 268.31 µg/mL (α‐glucosidase) at 210°C. Anti‐biofilm activity peaked at 90°C (IC50 = 33.55 µg/mL), with untreated and 60°C extracts showing strong inhibition (∼80%–90%). Above 90°C, inhibition dropped, reaching IC50 of 253.53 µg/mL at 210°C. Moderate heating (60–90°C) optimizes bioactive availability, positioning R. vesicarius for pharmaceutical and nutraceutical applications.
Valorization of Honduran Agro-Food Waste to Produce Bioplastics Daniel Castro-Criado, Octavio Rivera-Flores, Johar Amin Ahmed Abdullah, Elia Castro-Osorto, María Alonso-González, Lucy Ramos-Casco, Víctor M. Perez-Puyana, Marlon Sánchez-Barahona, Pablo Sánchez-Cid, Mercedes Jiménez-Rosado, Alberto Romero Polymers, 2023
MgO and MgO/char nanocomposites as efficient catalysts for the removal of thiophene and malachite green from aqueous systems A Guerram, B Khaled, SE Laouini, A Bouafia, I Ben Amor, D Barani, ... Journal of Sol-Gel Science and Technology 118 (1), 25 , 2026 2026
Mechanistic and Life-Cycle Framework for Green Nanomaterials in Atmospheric Water Harvesting N Al-Sadeq, JAA Abdullah, A Romero, VM Perez-Puyana Nanomaterials 16 (7), 433 , 2026 2026
Influence of agricultural residues on the formation of TiO2 phases: Real-time in situ X-ray diffraction monitoring in a reaction chamber R P Feitosa, JAA Abdullah, R R Peña-Garcia, M G Fonseca, ... Chemical Engineering Journal, 175556 , 2026 2026
Multifunctional Mn₃O₄/Fe₂O₃ Nanocomposite: A Green Approach for Enhanced Antioxidant Activity, Photocatalytic Dye Degradation, and Short-Term Fruit Shelf-Life Extension Z Alqarni, C Salmi, HA Mohammed, MA Al-sheikh, HY Medrasi, ... Journal of Inorganic and Organometallic Polymers and Materials 36 (3), 1722-1744 , 2026 2026
Enhanced Recovery of Antioxidants from Orange Peel Waste Using Sustainable Solvents: A Comparative Analysis of Solvent Systems and Operational Conditions Efficiency I Zaghbib, AMB González, CM Stinco, GMB Vides, A Romero, ... Food and Bioprocess Technology 19 (1), 16 , 2026 2026 Citations: 2
Enhanced Elimination of Dyes from Aqueous Solution and Antioxidant Activity Using Ascorbic Acid-Functionalized Iron Oxide Nanocomposites (vol 35, pg 3025, 2024) B Khaled, C Salmi, I Kir, HA Mohammed, SE Laouini, A Bouafa, F Alharthi, ... JOURNAL OF CLUSTER SCIENCE 36 (6) , 2025 2025
Correction: Enhanced Elimination of Dyes from Aqueous Solution and Antioxidant Activity Using Ascorbic Acid-Functionalized Iron Oxide Nanocomposites B Khaled, C Salmi, I Kir, HA Mohammed, SE Laouini, A Bouafa, F Alharthi, ... Journal of Cluster Science 36 (6), 230 , 2025 2025
An eco‐responsible approach to the synthesis of AgFeO 2 nanocomposite via Portulaca oleracea : Towards improved chlorpyrifos photocatalysis and antibacterial … D Barani, SE Laouini, A Bouafia, HA Mohammed, MS Mahboub, ... Environmental Progress & Sustainable Energy, e70151 , 2025 2025
Synthesis and Characterization of Amoxicillin‐Functionalized Ag/AgCl Nanoparticles: A Promising Multifunctional Platform for Next‐Generation Nanomedicine SE Laouini, A Bouafia, M Azzi, I Laib, M Fellah, MMS Abdullah, ... Journal of Biomedical Materials Research Part B: Applied Biomaterials 113 … , 2025 2025 Citations: 3
Comprehensive Bioactivities and Phytochemical Profiling of Rumex vesicarius : Antioxidant Potential, Anti‐Diabetic Properties, and Anti‐Biofilm Effects Under … A Bouafia, I Laib, SE Laouini, M Azzi, F Alharthi, AA Souwaileh, ... Chemistry & Biodiversity 22 (9), e202500329 , 2025 2025 Citations: 5
Synergetic green synthesis of CuO, ZnO, and CuO‑ZnO nanocomposite nanoparticles using Genista hispanica L. extract for enhanced photocatalytic and antioxidant properties Azabi, Warda, N Gherraf, A Romero, JAA Abdullah Research on Chemical Intermediates , 2025 2025 Citations: 4
Integrated Evaluation on the Anti‐Corrosion Potential of XC52 Alloy Mild Steel in Acidic Conditions Implying Schiff Base and Its Copper Complex A Aissa, MY Belghit, D Barani, Y Benaissa, SE Laouini, A Bouafia, ... Applied Organometallic Chemistry 39 (7), e70243 , 2025 2025 Citations: 2
Enhancing Atmospheric Water Harvesting Applications through the Integration of Green Silica and Zinc Oxide Nanoparticles into Chitosan Biopolymer N Al-Sadeq, VM Perez-Puyana, A Romero, JAA Abdullah 2025 Citations: 1
Ciprofloxacin-loaded copper oxide nanoparticles: Cutting-edge multifunctional nano-therapeutics with superior antidiabetic, antioxidant, anti-inflammatory, and antibacterial … I Laib, A Bouafia, SE Laouini, MMS Abdullah, HA Al-Lohedan, EM Alessa, ... Journal of Crystal Growth 653, 128074 , 2025 2025 Citations: 16
Gallic acid assisted synthesis of novel CuO/Ni/Fe 3 O 4 nanocomposite for catalytic CO 2 methanation and photocatalytic hydrogen generation C Salmi, Z Zelca, SE Laouini, S Meneceur, HA Mohammed, JAA Abdullah, ... Journal of Sol-Gel Science and Technology 113 (3), 670-682 , 2025 2025 Citations: 58
Evaluation of Dermal Wound Healing Potential: Phytochemical Characterization, Anti‐Inflammatory, Antioxidant, and Antimicrobial Activities of Euphorbia guyoniana Boiss. & Reut … K Segueni, A Chouikh, S Eddine Laouini, A Bouafia, M Laid Tlili, I Laib, ... Chemistry & Biodiversity 22 (3), e202402284 , 2025 2025 Citations: 12
Purification and Characterization of Transglutaminase Isolated from Sardine ( Sardina pilchardus ) Flesh Waste I Zaghbib, JAA Abdullah, M Hassouna, A Romero Polymers 17 (4), 510 , 2025 2025 Citations: 1
Eco-Friendly ZnO/CuO/Ni Nanocomposites: Enhanced photocatalytic dye adsorption and hydrogen evolution for sustainable energy and water purification S Meneceur, SE Laouini, HA Mohammed, A Bouafia, C Salmi, ... Journal of Crystal Growth 650, 127984 , 2025 2025 Citations: 82
Aerogels Based on Chitosan and Collagen Modified with Fe 2 O 3 and Fe 3 O 4 Nanoparticles: Fabrication and Characterization CM Granados-Carrera, D Castro-Criado, JAA Abdullah, ... Polymers 17 (2), 133 , 2025 2025 Citations: 12
Eco-Friendly ZnO/CuO/Ni Nanocomposites: enhanced photocatalytic dye adsorption and hydrogen evolution for sustainable energy and water purification M Souhaila, EL Salah, HA Mohammed, B Abderrhmane, S Chaima, ... J. Cryst. Growth 650, 127984 , 2025 2025 Citations: 3
MOST CITED SCHOLAR PUBLICATIONS
Green synthesis and characterization of iron oxide nanoparticles by pheonix dactylifera leaf extract and evaluation of their antioxidant activity JAA Abdullah, LS Eddine, B Abderrhmane, M Alonso-González, ... Sustainable Chemistry and Pharmacy 17, 100280 , 2020 2020 Citations: 283
Biogenic ZnO/CuO/Fe 2 O 3 Nanocomposite: A Groundbreaking Approach for Enhanced Degradation Capabilities and Reusability in Dye Removal Applications A Serouti, LS Eddine, S Meneceur, GG Hasan, HA Mohammed, C Salmi, ... Arabian Journal for Science and Engineering 49 (1), 753-764 , 2024 2024 Citations: 109
Removal efficiency of heavy metals, oily in water, total suspended solids, and chemical oxygen demand from industrial petroleum wastewater by modern green nanocomposite methods S Meneceur, A Bouafia, SE Laouini, HA Mohammed, H Daoudi, S Chami, ... Journal of Environmental Chemical Engineering 11 (6), 111209 , 2023 2023 Citations: 98
One Post Biosynthesis of Novel Ternary Nanocomposite ZnO/CuO/Cu 2 MgO 3 for Enhancing Photocatalytic Degradation of Bromocresol Green in Wastewater A Tabet, S Meneceur, SE Laouini, C Salmi, HA Mohammed, I Kir, ... Journal of Cluster Science 35 (3), 765-777 , 2024 2024 Citations: 95
Plant extract-mediated synthesis of CuO nanoparticles from lemon peel extract and their modification with polyethylene glycol for enhancing photocatalytic and antioxidant … I Kir, HA Mohammed, SE Laouini, M Souhaila, GG Hasan, JAA Abdullah, ... Journal of Polymers and the Environment 32 (2), 718-734 , 2024 2024 Citations: 95
Green synthesis of α-Fe2O3 and α-Fe2O3@ Ag NC for degradation of rose Bengal and antimicrobial activity R Zouari Ahmed, SE Laouini, C Salmi, A Bouafia, S Meneceur, ... Biomass Conversion and Biorefinery 15 (1), 255-269 , 2023 2023 Citations: 87
Synergistic chitin-zinc nanocomposites from shrimp shell waste: characterization, antioxidant, and antibacterial properties A Aouadi, DH Saoud, SE Laouini, A Rebiai, A Achouri, HA Mohammed, ... Biomass Conversion and Biorefinery 15 (1), 545-561 , 2025 2025 Citations: 83
Eco-Friendly ZnO/CuO/Ni Nanocomposites: Enhanced photocatalytic dye adsorption and hydrogen evolution for sustainable energy and water purification S Meneceur, SE Laouini, HA Mohammed, A Bouafia, C Salmi, ... Journal of Crystal Growth 650, 127984 , 2025 2025 Citations: 82
Effect of Calcination Temperature and Time on the Synthesis of Iron Oxide Nanoparticles: Green vs. Chemical Method JAA Abdullah, M Jiménez-Rosado, A Guerrero, A Romero Materials 16 (5), 1798 , 2023 2023 Citations: 82
Enhancing oxidant and dye scavenging through MgO-based chitosan nanoparticles for potential antioxidant coatings and efficient photocatalysts IB Amor, H Hemmami, SE Laouini, S Ahmed, HA Mohammed, ... Biomass Conversion and Biorefinery 14 (24), 32343-32357 , 2024 2024 Citations: 73
Biosynthesis of ZnO/Ag nanocomposites heterostructure for efficient photocatalytic degradation of antibiotics and synthetic dyes L Hamza, SE Laouini, HA Mohammed, S Meneceur, C Salmi, F Alharthi, ... Zeitschrift für Physikalische Chemie 238 (9), 1599-1622 , 2024 2024 Citations: 73
Enhanced photocatalytic activity and antiviral evaluation of CuO@Fe 2 O 3 NC for amoxicillin degradation and SARS-CoV-2 treatment S Legmairi, S Meneceur, GG Hasan, LS Eddine, HA Mohammed, ... Nanotechnology 34 (44), 445101 , 2023 2023 Citations: 67
Eco-friendly synthesis of ZnO-nanoparticles using Phoenix dactylifera L., polyphenols: physicochemical, microstructural, and functional assessment JAA ABDULLAH, M Jiménez-Rosado, A Guerrero, A Romero New Journal of Chemistry; DOI https://doi.org/10.1039/D3NJ00131H , 2023 2023 Citations: 66
Novel CuO–SiO 2 nanocomposites: synthesis, kinetics, recyclability, high stability and photocatalytic efficiency for Rose Bengal dye removal AH Gharbi, H Hemmami, SE Laouini, A Bouafia, I Ben Amor, S Zeghoud, ... Transition Metal Chemistry 49 (3), 195-213 , 2024 2024 Citations: 64
Biogenic synthesis of Fe 3 O 4 /NiO nanocomposites using Ocimum basilicum leaves for enhanced degradation of organic dyes and hydrogen evolution LS Eddine, HA Mohammed, C Salmi, M Souhaila, GG Hasan, F Alharthi, ... Journal of Porous Materials 31 (1), 213-226 , 2024 2024 Citations: 64
Biopolymer-based films reinforced with green synthesized zinc oxide nanoparticles JAA Abdullah, M Jiménez-Rosado, A Guerrero, A Romero Polymers 14 (23), 5202 , 2022 2022 Citations: 60
Green synthesis of ZnO@SiO 2 nanoparticles using Calligonum comosum L. extract: an efficient approach for organic pollutant degradation in wastewater AH Gharbi, H Hemmami, SE Laouini, IB Amor, S Zeghoud, AB Amor, ... Biomass Conversion and Biorefinery 15 (1), 701-712 , 2025 2025 Citations: 59
Gallic acid assisted synthesis of novel CuO/Ni/Fe 3 O 4 nanocomposite for catalytic CO 2 methanation and photocatalytic hydrogen generation C Salmi, Z Zelca, SE Laouini, S Meneceur, HA Mohammed, JAA Abdullah, ... Journal of Sol-Gel Science and Technology 113 (3), 670-682 , 2025 2025 Citations: 58
Green Synthesis of SnO 2 Nanoparticles from Laurus nobilis L. Extract for Enhanced Gelatin-Based Films and CEF@SnO 2 for Efficient Antibacterial Activity HA Mohammed, LS Eddine, M Souhaila, GG Hasan, I Kir, JAA Abdullah Food and Bioprocess Technology 17 (5), 1364-1382 , 2024 2024 Citations: 57
Photocatalytic dye degradation efficiency and reusability of potassium polyacrylate hydrogel loaded Ag@ ZnO nanocomposite A Boutalbi, HA Mohammed, S Meneceur, LS Eddine, JAA Abdullah, ... Transition Metal Chemistry 48 (5), 353-363 , 2023 2023 Citations: 57
INDUSTRY EXPERIENCE
Nanoparticles; Nanotechnology; Green synthesis; Chemical synthesis; Polymers; biopolymers; Characterization; Iron oxide; zinc oxide; antioxidant; antibacterial; physico-chemical properties; Magnetic proerties; metal oxides; Hydrogels; Rheology
