Publications by authors named "Rehab Mahmoud"

Article Synopsis
  • The increasing presence of pharmaceutical residues threatens ecosystems, highlighting the need for effective materials to absorb these contaminants; waste eggshells serve as a potential recyclable resource for creating valuable adsorbents.
  • CaO-based ZnFe-layered double hydroxide is shown to be a promising adsorbent for caffeine, demonstrating biodegradability, minimal toxicity to human cells, and strong antimicrobial properties against various bacteria.
  • The study evaluated various factors affecting adsorption efficiency and confirmed the materials’ efficacy through multiple analytical techniques, supporting sustainable development and zero-waste initiatives.
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The energy crisis is the most urgent issue facing contemporary society and needs to be given top priority. As energy consumption rises, environmental pollution is becoming a serious issue. Direct methanol fuel cells (DMFCs) have emerged as the most promising energy source for a variety of applications such as electric vehicles and portable devices.

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This study proposes an innovative approach to combat the escalating threat of antibiotic resistance in bacteria by introducing a novel ZnO-propolis nanocomposite (ZnO-P NCs). The overuse of antibiotics, particularly during events like the COVID-19 pandemic, has intensified bacterial resistance, necessitating innovative solutions. The study employs a cost-effective and controllable biosynthesis method to produce ZnO nanoparticles (ZnO-NPs), with propolis extract crucially contributing to the reduction and stabilization of Zn ions.

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Bacterial resistance to conventional antibiotics has created an urgent need to develop enhanced alternatives. Nanocomposites combined with promising antibacterial nanomaterials can show improved antimicrobial activity compared to that of their components. In this work, green synthesized CuO nanoparticles (NPs) supported on an anionic clay with a hydrotalcite-like structure such as Zn-Al layered double hydroxide (LDH) nanocomposite were investigated as antimicrobial agents.

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Article Synopsis
  • - The study examined how effectively benzalkonium chloride (BAC) can be removed using a system involving zero valent iron and persulfate (Fe/PS), focusing on how factors like persulfate concentration, iron dosage, and pH influence the process.
  • - At an optimal iron dosage of 5.0 mM and PS to BAC ratio of 10:1, BAC degradation reached about 91.7% efficiency in 60 minutes at pH 7.0, with minimal interference from common inorganic substances, suggesting the system's potential for treating wastewater.
  • - Various degradation pathways were identified, involving reactions like dealkylation and hydroxylation, with 23 intermediates discovered through advanced testing;
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  • Nanoscale geranium waste and magnesium nanoparticle composites were created using eco-friendly methods and analyzed for their physical and chemical properties through various techniques, like XRD and FTIR.
  • The study found that low concentrations of these nanocomposites improved seed germination but also led to decreased cell division and increased chromosomal abnormalities.
  • Furthermore, the influence of these materials on the expression of specific plant genes essential for terpenoid biosynthesis was assessed, revealing significant increases in certain gene expressions, suggesting their potential as environmentally friendly alternatives to traditional fertilizers.
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Water softening is a treatment process required to remove calcium (Ca(II)) and magnesium (Mg(II)) cations from water streams. Nanocomposites can provide solutions for such multiple challenges and have high performance and low application costs. In this work, a multimetallic cobalt, nickel, and copper 2-aminoterephthalic acid metal-organic framework ((Co/Ni/Cu-NHBDC) MOF) was synthesized by a simple solvothermal technique.

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In this investigation, we conducted a detailed analysis of the oxidation of 16 imidazole ionic liquid variants by Fe(VI) under uniform experimental setups, thereby securing a dataset of second-order reaction rate constants (k). This methodology ensures superior data consistency and comparability over traditional methods that amalgamate disparate data from varied studies. Utilizing 16 chemical structural parameters obtained via Density Functional Theory (DFT) as descriptors, we developed a Quantitative Structure Activity Relationship (QSAR) model.

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Developing cost-effective and efficient adsorbents for heavy metals in multicomponent systems is a challenge that needs to be resolved to meet the challenges of wastewater treatment technology. Two adsorbents were synthesized, characterized, and investigated for the removal of Cd and Cr as model heavy metals in their single and binary solutions. The first adsorbent (ACZ) was a nanocomposite formed of O-Carboxymethyl chitosan, sodium alginate, and zeolite.

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Soil contamination of polycyclic aromatic hydrocarbons (PAHs), especially caused by the mixture of two or more PAHs, raised great environmental concerns. However, research on the migration and transformation processes of PAHs in soils and their interactions with native communities is limited. In this work, soil samples from uncontaminated sites around the industrial parks in Handan, Hengshui, and Shanghai were artificially supplemented with three concentrations of anthracene (Ant), 9-chloroanthracene (9-ClAnt), benzopyrene (BaP), and chrysene (Chr).

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The increase in antibiotic residues poses a serious threat to ecological and aquatic environments, necessitating the development of cost-effective, convenient, and recyclable adsorbents. In our study, we used cellulose-based layered double hydroxide (LDH) as an efficient adsorbent and nanocarrier for both sulfamethoxazole (SMX) and cefixime (CFX) residues due to their biodegradability and biocompatibility. Chemical processes are measured according to green chemistry metrics to identify which features adhere to the principles.

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Layered double hydroxides (LDH) are promising 2D nanomaterials being investigated for several engineering and biomedical applications. In this work, quinary Zr Al Fe Co Ni LDH and its Al Fe Co Ni LDH quaternary and Fe Co Ni LDH tertiary roots were prepared and characterized. All samples showed an aggregated, layered morphology with zero surface charge and approximately 300 nm of hydrodynamic size.

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A simple technique was developed for the modification of cotton materials that is inexpensive, environmentally friendly, and very effective. Waste Cotton fabrics (WCFs) are loaded with propolis extract (PE) for Cu removal. Then, Cu underwent a pyrolysis process with modified cuttlebone (CB) at 900 °C for 5 h.

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Most fungal bone and joint infections (arthritis) are caused by Mucormycosis (). These infections may be difficult to treat and may lead to chronic bone disorders and disabilities, thus the use of new antifungal materials in bone disorders is vital, particularly in immunocompromised individuals, such as those who have contracted coronavirus disease 2019 (COVID-19). Herein, we reported for the first time the preparation of nitrogen-doped carbon quantum dots (N/CQDs) and a nitrogen-doped mesoporous carbon (N/MC) using a quick micro-wave preparation and hydrothermal approach.

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Background: Using Zonulin and Copeptin as potential obesity markers in children, hasn't yet been focused.

Aim: To evaluate the association between serum levels of both Zonulin and Copeptin with the obesity markers, and to assess their role as metabolic disturbance predictors in obese children.

Methods: A case-control study comprised 111 Egyptian children (45 males and 66 females); aged 6-10 years to avoid the effect of puberty (prepubertal).

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Fluoxetine (FLX) is one of the most persistent pharmaceuticals found in wastewater due to increased use of antidepressant drugs in recent decades. In this study, a nanocomposite of ternary ZnCoAl layered double hydroxide supported on activated carbon (LAC) was used as an adsorbent for FLX in wastewater effluents. The nanocomposite was characterized using Fourier Transform Infrared Spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and surface area analysis (BET).

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Article Synopsis
  • Layered double hydroxides (LDHs), specifically a ternary Zn-Co-Fe LDH, were synthesized and characterized, showcasing a small crystallite size and a significant surface area, which are important for their functionality.
  • The LDH effectively adsorbed moxifloxacin, a common antibiotic, with a remarkable removal efficiency of 217.81 mg/g within 60 minutes.
  • Moreover, it demonstrated notable antifungal activity against various fungi, particularly Penicillium and Mucor, achieving high inhibition rates and low minimum inhibitory concentrations (MIC), indicating its potential use in water treatment and disinfection.
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  • Red ginseng and propolis are antioxidants that may help reduce oxidative stress, and this study examined their effectiveness against testicular damage caused by dexamethasone in male rats.
  • Forty rats were divided into eight groups to evaluate the effects of different treatments, revealing that dexamethasone led to lower testosterone levels and degraded semen quality while affecting gene expression related to testicular health.
  • The results indicated that nano-form propolis and conventional ginseng were effective in countering the oxidative stress caused by dexamethasone, while neither nano-ginseng nor conventional propolis had significant protective effects.
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Treating polluted wastewater effluents on a large-scale requires the development of high performance and cost-effective adsorbents. The recycling of waste mandarin peels, an environmentally friendly, and copiously available waste biomass into biochar (MRBC), has been approached. In the context of finding affordable and effective solutions for depollution of wastewater, MRBC was used for the adsorption of two dyes: methylene blue (MB) as well as basic fuchsin (BF) from their individual solutions and binary combinations.

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Nanotechnology holds substantial promise in the innovative therapies for rheumatoid arthritis (RA). The current study was designed to synthesize and characterize a new graphene titanate nanocomposite (GTNc) and explore its anti-arthritic, anti-inflammatory, and antioxidant potencies against Complete Freund's adjuvant (CFA)-induced arthritis in rats, as well as investigate the underlying molecular mechanisms. Our characterization methods included XRD, FT-IR, SEM, EDX, zeta potential, practical size, and XRF to characterize the novel GTNc.

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spp. is considered one of the most important causes of food-borne illness globally. Poultry and its products are usually incriminated in its spread.

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Background: Mesenchymal stem cells (MSCs) have been extensively used as cell-based treatments for decades due to their anti-inflammatory, immunomodulatory, and healing abilities. The intent of our study was to determine the efficacy of MSCs in alleviating rheumatoid arthritis (RA) induced by Complete Freund's adjuvant (CFA) and to investigate the anti-inflammatory and antioxidant characteristics of MSCs.

Methods And Results: Intrapedally injecting 0.

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Article Synopsis
  • - The study focused on developing a rapid and effective method for separating and determining the levels of three drugs—ciprofloxacin (CIP), ibuprofen (IBU), and diclofenac sodium (DIC)—in human plasma samples while also examining their pharmacokinetics.
  • - Using ultra-performance liquid chromatography (UPLC) with a specific column and mobile phase, the drugs were effectively separated, with detection limits ranging from 0.2 to 25 µg/mL, and demonstrated high precision and accuracy in results.
  • - The method, which took only 4 minutes for analysis, met FDA validation requirements and incorporated green chemistry principles to evaluate its environmental impact.
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Prostate cancer treatment poses significant challenges due to its varying aggressiveness, potential for metastasis, and the complexity of treatment options. Balancing the effectiveness of therapies, minimizing side effects, and personalizing treatment strategies are ongoing challenges in managing this disease. Significant advances in the use of nanotechnology for the treatment of prostate cancer with high specificity, sensitivity, and efficacy have recently been made.

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