Abstract
In this study, the nanocomposites of reduced graphene oxide/TiO2 (rGO/TiO2 with different percentages) have been synthesized using a modified Hummers’ method followed by hydrothermal treatment. The morphology and bonding structure of the prepared samples have been characterized by Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). The photo-characteristic aspects of the prepared samples have been indicated by photoluminescence (PL) emission spectroscopy and ultraviolet-visible diffuse reflection spectroscopy (DRS). The photocatalytic performance of rGO/TiO2 demonstrated that it is an effective photocatalyst for methylene blue (MB) dye decomposition through illumination by a mercury lamp. Within 60 min of continuous irradiation, the nanocomposite-induced MB decomposition reached a rate of over 99%. Different MB concentrations and optimal percent loadings in catalysts have been investigated. Furthermore, the results showed that as the amount of catalyst increased, the decomposition of MB enhanced. Finally, the loading percentage of rGO with TiO2 has been studied, and an empirical equation relating the reaction rate constant until the mass of the photocatalyst and dye concentration has been proposed. The results showed that the prepared nanocomposites had good photocatalytic activity toward water splitting and photo-decomposition of MB.
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Experimental data are available upon request.
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Hager M. Moustafa: experimentation and analysis, writing—original draft preparation (60%). Mohamed S. Mahmoud: interpreting kinetic study part, writing—reviewing and editing (20%). Mamdouh M. Nassar: conceptualization, interpreting characterization part (20%).
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Moustafa, H.M., Mahmoud, M.S. & Nassar, M.M. Kinetic analysis of p-rGO/n-TiO2 nanocomposite generated by hydrothermal technique for simultaneous photocatalytic water splitting and degradation of methylene blue dye. Environ Sci Pollut Res 30, 18181–18198 (2023). https://doi.org/10.1007/s11356-022-23430-w
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DOI: https://doi.org/10.1007/s11356-022-23430-w