Browsing by Author "Erol, M"

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    Visible light-induced self-cleaning ZnO coated-clay roofing tiles: The role of coating concentration on structural and photocatalytic properties
    Yavas, A; Günes, F; Erol, M; Sütçü, M; Özdemir, ET
    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 degrees 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 x 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 x 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.