Sustainable solar-light-driven SrTiO₃/PbBiO₂Br (STO/PBOB) nanocomposites have been successfully synthesized via a facile hydrothermal process coupled with a sol–gel/calcination method. The morphology, microstructure, element valence, and optical and electrochemical performance of the as-prepared photocatalysts were explored by multiple techniques. The results reveal that the STO/PBOB nanocomposites are composed of cubic STO nanoparticles and cauliflower-like PBOB microspheres. The photocatalytic performance of the samples was evaluated by decomposing crystal violet (CV) dye. The results indicated that the STO/PBOB nanocomposites exhibited superior photocatalytic performance for removal of CV dye solution under simulated solar light irradiation. Among the as-prepared materials, the STO/PBOB (1:1) nanocomposite displayed the optimal photocatalytic performance, which reached up to 3.14 and 1.45 times that of pure STO and PBOB, respectively. This enhanced photocatalytic activity of the STO/PBOB nanocomposites can be attributed to greater transfer channels for electrons and holes and efficient suppression of charge recombination. The results of active species trapping experiments demonstrated that \( \cdot {\rm OH} \) radicals and holes are the main active species in the STO/PBOB photocatalytic system. Furthermore, based on the experimental results and analyses, a possible photocatalytic mechanism for the STO/PBOB composites is proposed.

可持续的太阳光驱动SrTiO ₃ / PbBiO ₂溴（STO / PBOB）纳米复合材料已经通过简便的水热工艺与溶胶-凝胶/煅烧方法成功合成。通过多种技术探索了所制备光催化剂的形貌，微观结构，元素价以及光学和电化学性能。结果表明，STO / PBOB纳米复合材料由立方STO纳米颗粒和菜花状PBOB微球组成。通过分解结晶紫（CV）染料评估样品的光催化性能。结果表明，在模拟太阳光照射下，STO / PBOB纳米复合材料具有优异的光催化性能，可去除CV染料溶液。在制备的材料中，STO / PBOB（1：1）纳米复合材料表现出最佳的光催化性能，达到了3.14和1。分别是纯STO和PBOB的45倍。STO / PBOB纳米复合材料的这种增强的光催化活性可以归因于更大的电子和空穴传输通道以及对电荷复合的有效抑制。活性物种捕获实验的结果表明\（\ cdot {\ rm OH} \）自由基和空穴是STO / PBOB光催化系统中的主要活性物质。此外，根据实验结果和分析，提出了一种可能的STO / PBOB复合材料光催化机理。