| 磁性可见光催化剂BiVO4/Fe3O4的制备及催化活性 |
| Preparation and Photocatalytic Properties of Magnetically Separable Visible-Light Photocatalyst BiVO4/Fe3O4 |
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| 摘要: 采用超声法将磁基体Fe3O4和BiVO4复合，制备了易于固液分离的磁性可见光催化剂BiVO4/Fe3O4。采用X射线衍射(XRD)、傅立叶转换红外光谱(FTIR)、紫外-可见漫反射光谱(DRS)、透射电子显微镜(TEM)和磁学性质测量系统(MPMS)对产物进行了表征，并以亚甲基蓝为目标降解物，考察了BiVO4/Fe3O4的可见光催化活性。当BiVO4与Fe3O4质量比为5∶1时，BiVO4/Fe3O4的催化活性最高，反应经过5 h，对亚甲基蓝的降解率达到92.0%，而单独使用BiVO4为催化剂，降解率仅为72.5%。这表明Fe3O4不仅起到磁基体的作用，还起到助催化剂的作用。BiVO4/Fe3O4在外加磁场的作用下很容易被分离，撤消外加磁场后，通过搅拌又可重新分散。BiVO4/Fe3O4 3次回收后的降解率仍高于80%。 |
| 关键词: BiVO4/Fe3O4 磁性分离 超声法 可见光催化剂 |
| 基金项目: |
| Abstract: A magnetically separable visible-light photocatalyst BiVO4/Fe3O4 was prepared by ultrasonic method. Magnetite Fe3O4 permits easy recovery after photocatalytic degradation process by magnetic force. The as-prepared composites were characterized by X-ray diffraction (XRD), UV-Visible diffuse reflectance spectra (DRS), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and magnetic property measurement system (MPMS). The photocatalytic activities were evaluated by degradation of methylene blue (MB) aqueous solution under visible light (λ＞400 nm). Photocatalyst with BiVO4/Fe3O4 mass ratio of 5∶1 showed the highest degradation rate up to 92.0% in 5 h, while the degradation rate with BiVO4 was 72.5%. The results indicate that Fe3O4 acts not only as magnetic particles but also as a promoter. The photocatalyst can be easily separated by an external magnetic field and re-dispersed into aqueous solution by stirring after removal of external magnetic field. The photocatalyst can be reused three times without considerable loss of activity and the photocatalyst still has a degradation rate of 80% in 5 h. |
| Keywords: BiVO4/Fe3O4 magnetically separable ultrasonic method visible-light photocatalyst |
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| 晏 威,王 姣,朱 毅,郭 佳,杨 骏,张渊明.磁性可见光催化剂BiVO4/Fe3O4的制备及催化活性[J].无机化学学报,2011,27(2):287-292. |
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