铁酸铋微米立方体的可控制备及光降解性能研究

Size-controlled synthesis of BiFeO_3 microcubes:Characterization and its photocatalytic properties

通过恒温油浴预处理以及水热反应,合成了尺寸可控的铁酸铋立方体。分别用扫描电子显微镜、X射线衍射仪和X射线光电子能谱详细表征了所合成样品的微观形貌、晶体结构以及表面成分。通过控制水热反应的时间,对样品进行X射线衍射分析,初步确定了铁酸铋晶体的生长机理。通过将油浴恒温预处理的温度在25℃到90℃之间调节,可以实现对所合成的铁酸铋微米立方的尺寸在8～1.5μm范围内可调。以罗丹明B作为处理对象,研究了不同尺寸的颗粒在可见光照射下的催化降解性能。实验表明1.5μm的样品具有最高的催化活性。

BiFeO3 microcubes were successfully synthesized via a controlled preprocessing process combined with subsequent hydrothermal reaction.The morphology features,crystal structure,and surface compositions of the BiFeO3 microcubes were characterized by scanning electron microscope,X-ray diffraction and X-ray photoemission spectra in detail.And time-dependent experiments were conducted to reveal the growth mechanism of the BiFeO3 microcubes.More attractively,the size of the cubes can be consecutively controlled from 8μm to 1.5μm through adjusting the preprocessing temperature from 25℃to 90℃.When employed as photocatalysts towards Rhodamine B degradation,the 1.5μm samples showed the best catalytic activity.