State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 DingXi Road, Shanghai 200050, PR China.
J Hazard Mater. 2009 Dec 15;172(1):338-44. doi: 10.1016/j.jhazmat.2009.07.017. Epub 2009 Jul 25.
Nanosized BiVO4 with high visible-light-induced photocatalytic activity was successfully synthesized via ultrasonic-assisted method with polyethylene glycol (PEG). The BiVO4 sample prepared under ultrasonic irradiation with 1g PEG for 30 min was consisted of small nanoparticles with the size of ca. 60 nm. The effects of ultrasonic irradiation and surfactant were investigated. The nanosized BiVO4 exhibited excellent visible-light-driven photocatalytic efficiency for degrading organic dye, which was increased to nearly 12 times than that of the products prepared by traditional solid-state reaction. Besides decoloring, the reduction of chemical oxygen demand (COD) concentration was also observed in the degradation of organic dye, further demonstrating the photocatalytic performance of BiVO4. After five recycles, the catalyst did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst is essentially stable. Close investigation revealed that the crystal size, BET surface area, and appropriate band gap of the as-prepared BiVO4 could improve the photocatalytic activities.
通过超声辅助法与聚乙二醇（PEG）成功合成了具有高光催化活性的纳米 BiVO4。在超声辐射下，用 1g PEG 处理 30min 制得的 BiVO4 样品由约 60nm 的小纳米颗粒组成。研究了超声辐射和表面活性剂的影响。纳米 BiVO4 在光催化降解有机染料方面表现出优异的可见光驱动效率，比传统固相反应制备的产物提高了近 12 倍。除了脱色外，在有机染料的降解过程中还观察到化学需氧量（COD）浓度的降低，进一步证明了 BiVO4 的光催化性能。经过五次循环，催化剂的光催化活性没有明显损失，证实了催化剂基本稳定。深入研究表明，所制备的 BiVO4 的晶体尺寸、BET 比表面积和适当的带隙可以提高光催化活性。
