Abstract
In this study, Bi2Fe4O9 photocatalysts were prepared using hydrothermal synthesis. Different morphologies of Bi2Fe4O9 with a mullite-type structure were prepared using various hydrothermal synthesis methods while controlling the concentration of the mineralizer NaOH. The characterization of photocatalysts involves the use of various methods such as X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy, and electrochemical impedance spectroscopy. The photocatalytic performance of the samples was evaluated by testing their sterilization effect on natural seawater. The study found that when exposed to simulated sunlight using a small amount of H2O2, Bi2Fe4O9 cubes exhibited exceptional photocatalytic activity in deactivating marine microorganisms. This was attributed to the fact that the primary exposed surface of the Bi2Fe4O9 cubes was (001), which has a low recombination rate of photoelectrons and holes. Electrons can react with H2O2 to generate more hydroxyl radicals, thereby enhancing the photocatalytic sterilization performance. The experiment on free radical capture demonstrated that the ·OH radical was the primary active substance in the sterilization process. This paper introduces a novel concept for the photocatalytic purification of seawater.
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This work is supported by the National Natural Science Foundation of China (No.52271340, 51879018).
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Song, Y., Ma, H., Sun, J. et al. Modulating Bi2Fe4O9 and its performance in inactivating marine microorganisms. Reac Kinet Mech Cat 137, 2253–2267 (2024). https://doi.org/10.1007/s11144-024-02654-6
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DOI: https://doi.org/10.1007/s11144-024-02654-6