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Submicron-sized Bi_2Fe_4O_9 crystals were successfully synthesized via the hydrothermal method,while micron-sized Bi_2Fe_4O_9 crystals with rod-like morphologies were obtained in the presence of the mineralizer KNO_3.X-ray diffraction,scanning electron microscopy and transmission electron microscopy were employed to characterize the products.According to a series of time-dependent experiments,it was concluded that the likeliest formation mechanism for the microrods was the Ostwald ripening process.It was proposed that the blocking effect of NO_3~- contributed to the formation of the rod-like powders.Moreover,the optical absorption of the prepared Bi_2Fe_4O_9 crystals was measured using an UV-vis spectrophotometer,indicating that Bi_2Fe_4O_9 powders can be used as effective photocatalysts under visible light.
Submicron-sized Bi_2Fe_4O_9 crystals were successfully synthesized via the hydrothermal method, while micron-sized Bi_2Fe_4O_9 crystals with rod-like morphologies were obtained in the presence of the mineralizer KNO_3.X-ray diffraction, scanning electron microscopy and transmission electron microscopy were employed to characterize the products. According to a series of time-dependent experiments, it was finished that the likeliest formation mechanism for the microrods was the Ostwald ripening process. It was proposed that the blocking effect of NO_3 ~ - contributed to the formation of the rod-like powders. Moreover, the optical absorption of the prepared Bi_2Fe_4O_9 crystals was measured using an UV-vis spectrophotometer, indicating that Bi_2Fe_4O_9 powders can be used as effective photocatalysts under visible light.