BiOBr/Zn₂GeO₄ heterojunctions decorated by Bi₂O₃ quantum dots (QDs; named as Bi₂O₃/BiOBr/Zn₂GeO₄ hereafter) with intriguing micro/nanostructures have been constructed via a two‐step hydrothermal route. The compositions, phases, and morphologies of Bi₂O₃/BiOBr/Zn₂GeO₄ were investigated in detail. The light absorption ability, photocurrent responses, and photocatalytic degradation of methylene blue (MB) experiments were performed to evaluate the photocatalytic activity of the micro/nanoheterostructured Bi₂O₃/BiOBr/Zn₂GeO₄, which present a degradation efficiency of 88% after 240 minutes under light irradiation (λ = 300‐600 nm) over 100 mg Bi₂O₃/BiOBr/Zn₂GeO₄ in a 100 mL, 4 mg/L MB solution. The photocatalytic performance could be retained for at least four runs, indicating its excellent reusability for the degradation of MB in aqueous solution. It is found that the photodegradation of MB over Bi₂O₃/BiOBr/Zn₂GeO₄ is mainly ascribed to a hole oxidation mechanism in combination with a superoxide oxidation process. The high photocatalytic performance of Bi₂O₃/BiOBr/Zn₂GeO₄ upon UV light irradiation can be attributed to the effective charge separation and smoothly transferring of the photogenerated charge carriers throughout the heterojunction. The feasible strategy of preparing Bi₂O₃/BiOBr/Zn₂GeO₄ ternary composites is also of benefit to fabricate other efficient heterojunction catalysts with specific morphologies and properties.

中文翻译：

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具有增强的光催化活性的Bi2O3 / BiOBr / Zn2GeO4异质结光催化剂的控制合成

通过两步水热法构建了由Bi ₂ O ₃量子点（以下称为Bi ₂ O ₃ / BiOBr / Zn ₂ GeO ₄）修饰的BiOBr / Zn ₂ GeO ₄异质结，并具有吸引人的微结构。详细研究了Bi ₂ O ₃ / BiOBr / Zn ₂ GeO ₄的组成，相和形貌。进行了亚甲基蓝（MB）的光吸收能力，光电流响应和光催化降解实验，以评估微/纳米结构Bi ₂的光催化活性。O ₃ / BiOBr / Zn ₂ GeO ₄，在100 mL的100 mg Bi ₂ O ₃ / BiOBr / Zn ₂ GeO ₄中，在光照射下（λ= 300-600 nm）240分钟后，降解效率为88％4 mg / L MB溶液。该光催化性能至少可以保留四次，这表明它具有极好的重用性，可用于水溶液中MB的降解。发现Bi ₂ O ₃ / BiOBr / Zn ₂ GeO ₄上MB的光降解主要归因于空穴氧化机理与超氧化物氧化过程的结合。铋的高光催化性能紫外光照射下的₂ O ₃ / BiOBr / Zn ₂ GeO ₄可以归因于有效的电荷分离和光生电荷载流子在整个异质结中的平稳转移。制备Bi ₂ O ₃ / BiOBr / Zn ₂ GeO ₄三元复合材料的可行策略也有利于制备具有特定形貌和性能的其他高效异质结催化剂。