Synthesis and Photocatalytic Activity of Bi₂Fe₄O₉ Using KOH as Mineralizer via Hydrothermal Method

抄録

Bi₂Fe₄O₉ nanoplatelets were successfully prepared via hydrothermal method using KOH as the mineralizer. The influence of KOH concentration on the morphology of the products was investigated. It is found that the thickness and edge length of as-prepared Bi₂Fe₄O₉ nanoplatelets can be tailored by adjusting the KOH concentration. With increase in the KOH concentration from 3 to 9 M, the thickness of nanoplatelets increases gradually, whereas their edge length exhibits a trend of decrease. A possible influencing mechanism of the KOH concentration on the morphology of Bi₂Fe₄O₉ nanoplatelets is proposed on the basis of experimental results. The photocatalytic activity of Bi₂Fe₄O₉ nanoplatelets was investigated by the degradation of methylene blue under simulated sunlight irradiation, indicating that they possess an appreciable photocatalytic activity. Furthermore, the as-prepared Bi₂Fe₄O₉ nanoplatelets present good photocatalytic reusability. Magnetic hysteresis loop measurement shows that the Bi₂Fe₄O₉ nanoplatelets exhibit weak ferromagnetic behavior at room temperature.