Abstract
The photoactive SiO2/WO3–TiO2@rGO nanocomposite was fabricated through sol–gel, microwave, and hydrothermal approaches for the photodegradation of methylene blue (MB) as an organic-colored pollutant. The nanocomposite photocatalysts were formulated by adjustment of the ingredients content to achieve efficient synergic effects on photocatalyst performance. The results exhibited that optimum amount of SiO2 and rise in WO3/TiO2 ratio as well as incorporation of reduced graphene oxide in structure can be led to further efficiency of degradation under visible light. The effect of sunlight irradiation, pH of MB solution, MB concentration, and lamp distance on photodegradation reaction were also investigated. The best performance about 99.9% MB degradation was obtained based on using 0.3 g/L of optimum photocatalyst to remove the 5 ppm MB solution with pH of 5.41 during 3 h irradiation by visible-light source with 30 cm distance from MB solution. As well, results showed that photocatalyst performance under visible light is better than sunlight irradiation. The most favorable photocatalyst indicated surface area of 60.9 m2/g. Furthermore, the reusability test indicated a proper activity after three cycles under the same conditions. So, the introduced efficient visible photoactive SiO2/WO3–TiO2@rGO nanocomposite can be considered as an appropriate potential to remove organic pollutants in colored effluents.
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Acknowledgements
The authors would like to thank Zahra Niazi (University of Kashan) for helpful discussion and her assistance.
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This work was financial supported by University of Kashan which is greatly acknowledged.
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Keshavarz, I., Ashjari, M. Efficient SiO2/WO3–TiO2@rGO nanocomposite photocatalyst for visible-light degradation of colored pollutant in water. J Mater Sci: Mater Electron 32, 20184–20196 (2021). https://doi.org/10.1007/s10854-021-06523-z
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DOI: https://doi.org/10.1007/s10854-021-06523-z