ORCID Profile
0000-0002-9444-1952
Current Organisations
University of Adelaide
,
Ain Shams University Faculty of Science
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Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Springer Science and Business Media LLC
Date: 18-07-2017
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer International Publishing
Date: 2022
Publisher: Elsevier BV
Date: 02-2022
Publisher: Springer Science and Business Media LLC
Date: 10-03-2021
DOI: 10.1038/S41598-021-84989-X
Abstract: Pristine and Co-doped TiO 2 mesocrystals have been synthesized via a simple sol–gel method and their antimicrobial activity has been investigated. The antimicrobial performance was evaluated in terms of zone of inhibition, minimum inhibitory concentration (MIC), antibiofilm activity, and effect of UV illumination in liquid media. The Co-doped TiO 2 mesocrystals showed very promising MIC of 0.390 μg/mL and 0.781 μg/mL for P. mirabilis and P. mirabilis , respectively . Additionally, the material showed an MIC of 12.5 μg/mL against C. albicans , suggesting its use as antifungal agent. Upon the addition of 10.0 µg/mL of Co-doped TiO 2 mesocrystals, the biofilm inhibition% reaches 84.43% for P. aeruginosa , 78.58% for P. mirabilis , and 77.81% for S. typhi , which can be ascribed to the created active oxygen species that decompose the tested microbial cells upon illumination. Thus the fabricated Co-doped TiO 2 mesocrystals exhibit sufficient antimicrobial features under visible light, qualifying them for use as antimicrobial agents against pathogenic bacteria and fungi and subsequently inhibit their hazardous effects.
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.1016/J.JPHOTOBIOL.2017.09.016
Abstract: As known, porphyrins have central role in photosynthesis, biological oxidation and reduction and oxygen transport beside to their intensive color which qualify them to be good photosensitizers. Herein, tetra (4-carboxyphenyl) porphyrin (TCPP) was prepared by a simple one-pot synthesis to use as a visible antenna for TiO
Publisher: IOP Publishing
Date: 12-2020
Abstract: A facile one-pot method was utilized at room-temperature for the synthesis of novel ternary nanocomposite of Ag@RGO/ZnO, which is introduced as a low cost, efficient and reliable UV absorber. The crystalline, morphological, structural, and optical characteristics of the as-synthesized s les were investigated by various techniques such as XRD, FE-SEM, HR-TEM, XPS, and DRS. The measurements confirm the successful fabrication of the Ag@RGO/ZnO ternary nanocomposite. Optical characterization showed the synergetic role of Ag NPs and RGO NSs in the enhancement of the light absorption of the ternary nanocomposite in the UV portion compared to the bare ZnO NPs. Additionally, band-gap narrowing was observed due to the Ag-doping impact where potential applications for the proposed nanocomposite have been suggested.
Publisher: Springer Science and Business Media LLC
Date: 09-08-2023
DOI: 10.1038/S41598-023-38497-9
Abstract: Water pollution is one of the global threats severely affecting our planet and human health. Organic textile dyes are one of the common organic water pollutants that are presentient to degradation by traditional physical methods. Semiconductor-assisted photocatalysis is considered a green, efficient, and sustainable technology for wastewater treatment. To maximize the efficient utilization of solar radiation, it is of pivotal significance to explore novel organic molecules to be employed as efficient dye sensitizers for wide-bandgap semiconductors to extend their performance to the Visible-light region. Hence, in this work, we are proposing the design and synthesis of novel structures of QAD molecule as a dye photosensitizer with extended visible light absorptivity due to the extended π–π/n–π conjugations, to promote the performance of TiO 2 nanoparticles to the visible-light region and enhance the charge separation. The physicochemical characterizations confirmed the successful synthesis of QAD, TiO 2, and QAD/TiO 2 s les with the proposed structures. The anchoring of QAD molecules on the surface of TiO 2 caused a substantial improvement in the optical characteristics of TiO 2 as well as overcoming its common drawbacks by decreasing its bandgap energy to 2.6 eV, a remarkable reduction of PL intensity indicating reducing the e–h recombination and enhancing the charge separation, and creation of efficient visible light-harvesting antenna in the range of 400–600 nm. Besides, the QAD/TiO 2 s le achieved a 3-fold enhancement in the observed rate constant of the photodegradation of Rhodamine B dye compared to the bare TiO 2 . The parameters affecting the photodegradation process were optimized and the s le displayed outstanding stability after 4 consecutive cycles. Finally, the effect of the scavengers was investigated and $${\\mathrm{O}}_{2}^{\\cdot -}$$ O 2 · - was proposed to be the most reactive species and the mechanism of the enhancement was suggested based on the electron injection from the QAD’s HOMO level to the TiO 2 ’s CB. Finally, this work opens the door for various studies for the investigation of the proposed structures or similar structures in various photocatalytic/biomedical applications.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2020
Publisher: Springer Science and Business Media LLC
Date: 11-02-2020
Publisher: MDPI AG
Date: 29-12-2022
DOI: 10.3390/BIOS13010051
Abstract: We report on the electrochemical determination of one the most effective and widely used chemotherapeutic, anti-inflammatory, and immunomodulator agents, methotrexate (MTX), using low-cost, green, and facile one-pot prepared graphitic carbon nitride (g-CN ) nanosheets. The g-CN nanosheets have been characterized utilizing Fourier transform infrared spectroscopy, X-ray diffraction(XRD), scanning electron microscopy(SEM), and density functional theory (DFT). In comparison to the bare carbon paste electrode (CPE), the g-CN -modified electrode showed a spectacular enhancement in the electrochemical oxidation and detection abilities of MTX. The proposed material exhibits very low limits of detection (12.45 nM) and quantification (41.5 nM), while possessing a wide linear range of 0.22–1.11 μM and 1.11–27.03 μM under optimized conditions at pH 7.0. Due to the ease of preparation of g-CN, it can be adopted for the cost-effective detection of MTX in industrial and clinical analyses.
No related grants have been discovered for Mahmoud Adel Hamza.