铋基可见光光催化剂的研究浅析

光催化被认为是解决由工业发展引起的当前能源和环境危机的有效方法。然而,由于其宽带隙,常规氧化物光催化剂的实际应用受到可见光吸收差的限制,因此,具有窄带隙的光催化剂的研究成为热门话题。在光催化剂领域中,铋基光催化剂因其高可见光光催化活性而备受关注。这篇综述总结了铋基光催化剂的类型、复合结构、形态控制和性能方面的最新进展,并在最后对在此研究领域中的铋基可见光光催化剂的未来发展进行了讨论。

Fabrication of a β-Bi_2O_3/BiOI heterojunction and its efficient photocatalysis for organic dye removal

To improve β-Bi2O3 photocatalysis,we couple β-Bi2O3 with BiO I to form β-Bi2O3/BiO I heterojunctions through an in-situ treatment with hydriodic acid. The prepared heterojunctions are characterized with X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,ultra violet-diffuse reflectance spectroscopy,and X-ray photoelectron spectroscopy. Upon visible-light irradiation（λ 420 nm）,the β-Bi2O3/BiO I heterojunctions,especially with the molar ratio of HI to β-Bi2O3 at 0.4,exhibit much higher photocatalytic activity than pure β-Bi2O3 and BiO I for the degradation of methyl orange. The efficient separation of photogenerated electron-hole pairs across the interface of the heterojunction between β-Bi2O3 and BiO I would be responsible for the enhanced photocatalytic performances.