Orthorhombic Bi₂SeO₅ with a flower-like microsphere is synthesized by a phase transformation synthesis process for the first time. This new photocatalyst has a bandgap energy of 3.5 eV and its fermi level locates at −0.86 V vs NHE from the results of UV–vis DRS and Mott–Schottky plot. The effects of the calcination temperature and reaction time on the morphology, photoabsorption performance, photoelectric property and photocatalytic activity have been investigated in detail. The as-prepared Bi₂SeO₅ exhibits highly efficient photocatalytic activity in the decomposition of organic dyes and aromatic compound, such as rhodamine B, methyl orange and bisphenol A in aqueous solution under the simulative sunlight irradiation. The high photocatalytic activity of Bi₂SeO₅ may be attributed to the high crystallinity, the hierarchical structure and the high separation and mobility of the charge carrier. Notably, the effect of the surface area on the activity could be neglected. During the photocatalytic reaction process, Bi₂SeO₅ shows very high stabilities among the structure, surface chemical state and activity. Furthermore, the DMPO spin-trapping ESR spectra and the control experiments reveal that the O₂⁻ radicals and photoinduced holes play an important role in the photocatalytic degradation process. Finally, a probable photocatalytic mechanism of Bi₂SeO₅ has been proposed.

首次通过相变合成法合成了具有花状微球的斜方晶Bi ₂ SeO ₅。这种新的光催化剂具有3.5 eV的带隙能，其费米能级位于NHS的−0.86 V处，这是通过UV-vis DRS和Mott-Schottky图得出的。详细研究了煅烧温度和反应时间对形貌，光吸收性能，光电性能和光催化活性的影响。制备的Bi ₂ SeO ₅在模拟阳光照射下，在水溶液中分解有机染料和芳族化合物（如若丹明B，甲基橙和双酚A）时，具有很高的光催化活性。Bi ₂ SeO ₅的高光催化活性可以归因于电荷载体的高结晶度，分层结构以及高分离度和迁移率。值得注意的是，表面积对活性的影响可以忽略。在光催化反应过程中，Bi ₂ SeO ₅在结构，表面化学状态和活性之间显示出很高的稳定性。此外，DMPO自旋捕获ESR谱图和对照实验表明，O ₂⁻自由基和光致空穴在光催化降解过程中起重要作用。最后，提出了Bi ₂ SeO ₅可能的光催化机理。