Abstract In this work, AuPt alloy nanoparticles were attached onto the surface of Bi2O3 particles to obtain AuPt/Bi2O3 composite. The existence of AuPt bimetallic alloy and their homogeneous distribution on Bi2O3 surface were fully confirmed by XPS characterization and HRTEM observation. The surface plasmon resonance (SPR) effect of noble metals was detected using Ultraviolet–visible diffuse reflectance spectra. The photocatalytic degradation and reduction ability of products were estimated using Acid orange 7 (AO7), phenol and Cr(VI) as the target reactant under simulated sunlight irradiation, indicating that AuPt/Bi2O3 composite possesses remarkable higher photocatalytic activity compared with bare, Au and Pt decorated Bi2O3. In addition, AuPt/Bi2O3 composite is proved to be a stable photocatalysts. The effective separation and migration of photoinduced electrons and holes in AuPt/Bi2O3 sample is demonstrated employing electrochemical and photoluminescence detection. The AuPt/Bi2O3 composite not only has suitable schottky barrier height for trapping the photogenerated charges but also exhibits surface plasmon resonance (SPR) effect, which leads to enhanced photocatalytic activity.

中文翻译：

---

通过修饰 AuPt 合金纳米粒子提高 Bi2O3 的光催化降解和还原性能

摘要 在这项工作中，AuPt 合金纳米颗粒附着在 Bi2O3 颗粒的表面上以获得 AuPt/Bi2O3 复合材料。XPS 表征和 HRTEM 观察充分证实了 AuPt 双金属合金的存在及其在 Bi2O3 表面的均匀分布。使用紫外-可见漫反射光谱检测贵金属的表面等离子体共振（SPR）效应。以酸性橙 7 (AO7)、苯酚和 Cr(VI) 作为目标反应物在模拟阳光照射下评估了产物的光催化降解和还原能力，表明 AuPt/Bi2O3 复合材料与裸、Au 和铂饰 Bi2O3。此外，AuPt/Bi2O3 复合材料被证明是一种稳定的光催化剂。使用电化学和光致发光检测证明了 AuPt/Bi2O3 样品中光致电子和空穴的有效分离和迁移。AuPt/Bi2O3 复合材料不仅具有合适的肖特基势垒高度来捕获光生电荷，而且还表现出表面等离子体共振 (SPR) 效应，从而提高光催化活性。