Abstract In this study, novel Z-scheme MoS2/Bi2WO6 (MB) heterostructured hierarchical flower-like microspheres were successfully prepared via an in-situ growth method on exfoliated MoS2 nanosheets. Experimental results indicated that the content of MoS2 played a key role in controlling the morphology and photocatalytic activity of MB heterostructures. MB-9 exhibited a highly enhanced photocatalytic activity under visible light irradiation compared to pure MoS2, Bi2WO6 and other MB composites, which can be ascribed to the stable Z-scheme heterostructure, leading to the efficient transfer and the separation of photoinduced electrons and holes. The photocatalytic degradation efficiency of rhodamine B (RhB) can reach 100% within 90 min and almost all of Pseudomonas aeruginosa (P. aeruginosa) can be killed after 60 min by MB-9. In addition, MB-9 displayed a nice stability during the photocatalytic process, which favored a long-term use. Moreover, a possible photocatalytic mechanism was proposed based on the active species trapping experiments and electron spin resonance (ESR) tests, verifying that the photogenerated holes (h+) and ⋅O2− radicals were the dominating active species, which followed the Z-scheme reaction mechanism. It is hoped that this work can provide valuable information on developing novel Z-scheme heterostructures with enhanced photocatalytic activities for potential environmental purification and energy conversion.

中文翻译：

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新型 Z 型 MoS2/Bi2WO6 异质结在可见光照射下具有高度增强的光催化活性

摘要 本研究通过原位生长法在剥离的 MoS2 纳米片上成功制备了新型 Z 型 MoS2/Bi2WO6 (MB) 异质结构分层花状微球。实验结果表明，MoS2 的含量在控制 MB 异质结构的形貌和光催化活性方面起着关键作用。与纯 MoS2、Bi2WO6 和其他 MB 复合材料相比，MB-9 在可见光照射下表现出高度增强的光催化活性，这可以归因于稳定的 Z 型异质结构，导致光生电子和空穴的有效转移和分离。罗丹明B（RhB）的光催化降解效率在90分钟内可达100%，60分钟后几乎所有铜绿假单胞菌（P. aeruginosa）被MB-9杀死。此外，MB-9在光催化过程中表现出良好的稳定性，有利于长期使用。此外，基于活性物种捕获实验和电子自旋共振（ESR）测试提出了一种可能的光催化机制，验证了光生空穴（h+）和 ⋅O2- 自由基是主要的活性物种，其遵循 Z 型反应机制。希望这项工作可以为开发具有增强光催化活性的新型 Z 型异质结构提供有价值的信息，以实现潜在的环境净化和能量转换。验证光生空穴 (h+) 和 ⋅O2− 自由基是主要的活性物质，遵循 Z 型反应机制。希望这项工作可以为开发具有增强光催化活性的新型 Z 型异质结构提供有价值的信息，以实现潜在的环境净化和能量转换。验证光生空穴 (h+) 和 ⋅O2− 自由基是主要的活性物质，遵循 Z 型反应机制。希望这项工作可以为开发具有增强光催化活性的新型 Z 型异质结构提供有价值的信息，以实现潜在的环境净化和能量转换。