In this work, the BaTiO₃ nanoparticles (hole acceptor) were firstly decorated on the surface of BiOBr nanoplates by hydrothermal method, and then AuAg alloy nanoparticles (electron acceptor) are selectively deposited on the uncovered surface of BiOBr nanoplates to form AuAg/BiOBr/BaTiO₃ composite using visible-light photodeposition method. It is found that the BaTiO₃ (∼55 nm) and AuAg (7–16 nm) nanoparticles are uniformly dispersed on the BiOBr surface, which are disconnected without direct contact between them. The visible-light photocatalytic degradation and reduction activity of products were evaluated using methyl orange (MO), acid orange 7 (AO7), rhodamine B (RhB) and Cr(VI) as the target reactant. After the combination of BiOBr with BaTiO₃, the BiOBr/BaTiO₃ composites exhibit enhanced photocatalytic activity. When the content of BaTiO₃ reaches about 10%, the BiOBr/10%BaTiO₃ composite exhibits best photocatalytic efficiency. Notably, the selective deposition of Au, Ag and AuAg alloy nanoparticles leads to the further enhancement of photocatalytic activity for BiOBr/10%BaTiO₃ composite, and the optimal photocatalytic activity can be achieved over AuAg/BiOBr/10%BaTiO₃ sample. The AuAg/BiOBr/10%BaTiO₃ composite is demonstrated to be an stable photocatalyst, which also exhibits efficient synergistic photocatalytic activity for the purification of the RhB/Cr(VI) and AO7/Cr(VI) mixture. The photogenerated charges performance of products was measured by electrochemical work station. The main active species participated in the photocatalytic reaction of AuAg/BiOBr/10%BaTiO₃ was detected. Based on above results, the synergistic modification mechanism of BaTiO₃ and AuAg alloy nanoparticles on the photocatalytic activity of BiOBr was proposed.

在这项工作中，首先通过水热法将 BaTiO ₃纳米粒子（空穴受体）装饰在 BiOBr 纳米片表面，然后将 AuAg 合金纳米粒子（电子受体）选择性沉积在 BiOBr 纳米片未覆盖的表面上，形成 AuAg/BiOBr/ BaTiO ₃复合采用可见光光沉积法。发现 BaTiO ₃ (~55 nm) 和 AuAg (7-16 nm) 纳米粒子均匀分散在 BiOBr 表面，它们之间没有直接接触而断开连接。以甲基橙（MO）、酸性橙7（AO7）、罗丹明B（RhB）和Cr（VI）为目标反应物，评价了产物的可见光光催化降解和还原活性。BiOBr与BaTiO ₃结合后，BiOBr/BaTiO ₃复合材料表现出增强的光催化活性。当BaTiO ₃含量达到10%左右时，BiOBr/10%BaTiO ₃复合材料表现出最佳的光催化效率。值得注意的是，Au、Ag和AuAg合金纳米粒子的选择性沉积导致BiOBr/10%BaTiO ₃复合材料的光催化活性进一步增强，并且可以在AuAg/BiOBr/10%BaTiO ₃样品上实现最佳光催化活性。AuAg/BiOBr/10%BaTiO ₃复合材料被证明是一种稳定的光催化剂，它还表现出有效的协同光催化活性，用于纯化 RhB/Cr(VI) 和 AO7/Cr(VI) 混合物。通过电化学工作站测量产品的光生电荷性能。检测到参与AuAg/BiOBr/10%BaTiO ₃光催化反应的主要活性物种。基于上述结果，提出了BaTiO ₃和AuAg合金纳米粒子对BiOBr光催化活性的协同改性机制。