Abstract
Pure-phase Bi2Fe4O9 microstructures have been successfully synthesized via a facile hydrothermal method without using any organic surfactants. It was found that the synthesis of micro-cubes and micro-plates of Bi2Fe4O9 can be controlled by adjusting the NaOH concentration from 6 M to 12 M, at 200 °C for 12 h, with an optimized Bi/Fe molar ratio of 2:1. With the increase of NaOH concentration, the morphology of the products developed from micro-cubes with a lateral size of 1.5 μm to micro-plates with a lateral size of 1 μm and a curved outline. Moreover, the as-synthesized Bi2Fe4O9 micro-cubes and micro-plates were evaluated for the photocatalytic degradation of methylene blue (MB) under visible light irradiation. A 90% degradation of MB with a time of 120 min has been achieved by using Bi2Fe4O9 micro-plates, where the first-order k constant was determined to be 0.01883 min−1. In addition, these micro-plates exhibit a typical ferromagnetic property at room temperature, offering an opportunity for efficient utilization and recycling via possible magnetic-assisted separation of organic pollutants for photocatalytic degradation.
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Funding
This work was financially supported by the National Natural Science Foundation of China (No. 51602286) and the Natural Science Foundation of Zhejiang Province (No. LY19E020015). Special thanks are also given to the strong support from the Visiting Scholar Fund from the State Key Lab of Silicon Materials of Zhejiang University.
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Yin, S.M., Li, W.Q., Cheng, R.S. et al. Hydrothermal Synthesis, Photocatalytic and Magnetic Properties of Pure-Phase Bi2Fe4O9 Microstructures. J. Electron. Mater. 50, 954–959 (2021). https://doi.org/10.1007/s11664-020-08583-z
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DOI: https://doi.org/10.1007/s11664-020-08583-z