Abstract Novel Bi2O4/NaBiO3 heterostructures were fabricated via a hydrothermal process. By controlling the reaction time, part of NaBiO3 could be in-situ transformed into Bi2O4, which endowed the obtained heterostructures with excellent interfacial contact. The heterostructures were characterized by using XRD, FT-IR, XPS, SEM, EDS mapping and DRS. Degradation of methyl orange (MO) and phenol was used to evaluate the photocatalytic activities of the samples under visible light irradiation. Bi2O4/NaBiO3 heterostructures exhibited enhanced photocatalytic performance compared with bare NaBiO3 and Bi2O4. The increased activity could be attributed to the effective separation and transfer of electron-hole pairs in type II Bi2O4/NaBiO3 heterojunction, which were confirmed by PL and photoelectrochemical tests. Meanwhile, the EPR and trapping experiments revealed that h+ and •O2− played a main role in the photocatalytic degradation reaction.

中文翻译：

---

具有增强的可见光光催化性能的 Bi2O4/NaBiO3 异质结构的水热合成

摘要 通过水热工艺制备了新型 Bi2O4/NaBiO3 异质结构。通过控制反应时间，部分 NaBiO3 可以原位转化为 Bi2O4，使所得异质结构具有良好的界面接触。通过使用 XRD、FT-IR、XPS、SEM、EDS 映射和 DRS 对异质结构进行了表征。甲基橙（MO）和苯酚的降解用于评估样品在可见光照射下的光催化活性。与裸 NaBiO3 和 Bi2O4 相比，Bi2O4/NaBiO3 异质结构表现出增强的光催化性能。活性增加可归因于 II 型 Bi2O4/NaBiO3 异质结中电子-空穴对的有效分离和转移，这通过 PL 和光电化学测试得到证实。同时，