Fabrication of composite photocatalysts that provide an easy charge transfer mechanism to enhance the photocatalytic activity is a promising approach for the removal of organic contaminants from the water bodies. In this series, for the first time, we have decorated Ni, Pt, and Pd on the surface of hydrothermally synthesized Cu-doped biphasic Bi2O3. The synthesized composites were analyzed using advanced characterization techniques to uncover the physicochemical properties of the materials. The XRD results revealed well crystalline nature of the materials with enhanced particle size as compared to binary composite. The optical analysis showed the improved optical characteristics of ternary composites. The photocatalytic activity was tested against the RhB and observed the ternary materials with enhanced activity when compared with the binary composite and 5 wt% was the optimum loading of the metal on the surface of Cu- doped Bi2O3. Pd decorated samples showed the highest photo removal of RhB where complete mineralization of dye is achieved only in 50 min which is ascribed to the increased absorption and reduced reunion of charge carriers. The effect of pH of the reaction medium and the role of reactive oxygen species were also examined. In the acidic medium, complete degradation of dye is achieved in 10 min only and holes are found prominent active species for the degradation of RhB. The synthesized materials were stable and could be used many times without significant loss in the photocatalytic activity.

复合光催化剂的制造提供了一种简单的电荷转移机制以增强光催化活性，是去除水体中有机污染物的一种有前景的方法。在本系列中，我们首次在水热合成的铜掺杂双相 Bi2O3 表面修饰 Ni、Pt 和 Pd。使用先进的表征技术对合成的复合材料进行分析，以揭示材料的物理化学性质。 XRD 结果表明，与二元复合材料相比，材料具有良好的结晶性质，且粒径增大。光学分析表明三元复合材料的光学特性得到改善。对RhB进行了光催化活性测试，观察到三元材料与二元复合材料相比具有增强的活性，并且5 wt%是Cu掺杂Bi2O3表面上金属的最佳负载量。 Pd 修饰的样品显示出最高的 RhB 光去除率，仅在 50 分钟内即可实现染料的完全矿化，这归因于电荷载流子吸收的增加和团聚的减少。还检查了反应介质 pH 值的影响和活性氧的作用。在酸性介质中，仅 10 分钟即可实现染料的完全降解，并且发现空穴是降解 RhB 的主要活性物质。合成的材料稳定，可以多次使用而不会显着损失光催化活性。