Browsing by Author "Erol M."

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    Enhanced photocatalytic properties of Sn-doped ZnO nanoparticles by flame spray pyrolysis under UV light irradiation
    (Turkish Chemical Society, 2018) Yurddaskal M.; Yildirim S.; Dikici T.; Yurddaskal M.; Erol M.; Aritman I.; Celik E.
    Zinc oxide (ZnO) is widely used in different areas thanks to its unique photocatalytic, optic and electrical properties. Sn doped ZnO nanoparticles were synthesized through flame spray pyrolysis (FSP) technique. The Sn dopant concentrations were 1, 3, 5, 7 and 9 at. % in produced ZnO nanoparticles. The structural analysis of the produced powders was performed by X-Ray Diffraction (XRD) methods. The surface morphology and particle size distribution of the nanoparticles were identified using scanning electron microscopy (SEM), and dynamic light scattering (DLS) techniques. In addition to this, produced photocatalysts were evaluated for degradation of aqueous methylene blue (MB) solutions under UV light irradiation. Sn-doped nanoparticles have superior photocatalytic activity compared to un-doped ZnO. © 2018, Turkish Chemical Society. All rights reserved.
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    Effects of Zn-doping on the photocatalytic activity and microstructures of nanocrystalline SnO2 powders
    (Turkish Chemical Society, 2018) Yurddaskal M.; Yildirim S.; Dikici T.; Yurddaskal M.; Erol M.; Aritman I.; Uygun H.D.E.; Celik E.
    In this study, undoped and Zn-doped SnO2 nanoparticles in different concentrations were synthesized by flame spray pyrolysis (FSP) technique. The produced particles were post-annealed after FSP process at 600 °C in order to obtain a crystalline structure. The structural analysis of the produced powders was performed by X-Ray Diffraction (XRD) methods. The surface morphology of the nanoparticles was identified using scanning electron microscopy (SEM). In addition, photocatalytic degradation of aqueous methylene blue (MB) solutions were evaluated using undoped and Zn-doped SnO2 nanoparticles under UV light illumination. Photocatalytic degradation of the MB solutions followed the pseudo-first-order-kinetics and the effect of the Zn doping amount on the photocatalytic reaction was investigated. © 2018, Turkish Chemical Society. All rights reserved.
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    Visible light-induced self-cleaning ZnO coated-clay roofing tiles: The role of coating concentration on structural and photocatalytic properties
    (Elsevier B.V., 2024) Yavaş A.; Güneş F.; Erol M.; Sütçü M.; Özdemir E.T.
    This study introduces a novel approach involving visible light-driven ZnO-coated clay roofing tiles. The primary focus is to explore the impact of coating concentration on both the self-cleaning photocatalytic performance and physical attributes of the tiles, with a goal of contributing to environmental remediation. The research involved synthesizing various sets of tile specimens subjected to firing at 1050 °C, including pristine tiles and those coated with different concentrations of ZnO through a sol-gel dip coating process. Comparative analysis encompassed physical properties such as aesthetic appearance, stability against environmental conditions, self-cleaning properties, and the ability to degrade methylene blue (MB) as an artificial pollutant. The results demonstrated a significant enhancement in the properties of clay roofing tiles due to the coating process. Tiles with higher concentrations of ZnO exhibited proportional improvements in photocatalytic activity and physical characteristics, including reduced water adsorption and porosity, compared to the original pristine tiles. Importantly, there was no discernible impact on the mechanical performance of the tiles following the coating application. Exposure to light induced a noticeable shift in surface wettability, resulting in a state of photo-induced superhydrophilicity for all specimens. Among the various concentrations tested, the optimal coating concentration of zinc nitrate hexahydrate solution was found to be 50 mM (C50), with an apparent reaction rate of 4.06 × 10−1 h−1 and a total removal efficiency of 93.72 % after dark adsorption and 6 h irradiation. In contrast, the pristine tiles, with a degradation rate of 2.66 × 10−1 h−1, only achieved a removal efficiency of 79.98 % under the same conditions. These findings highlight the promising potential of ZnO-coated clay roofing tiles for effective environmental applications. © 2024 Elsevier B.V.