Zhang Mingliang, Duo Fangfang, Lan Jihong, Zhou Jianwei, Chu Liangliang, Wang Chubei, Li Lixiang
Key Laboratory of Energy Materials and Electrochemistry Liaoning Province, School of Chemical Engineering, University of Science and Technology Liaoning 185 Qianshanzhong Road Anshan 114051 Liaoning China
Henan Photoelectrocatalytic Material and Micro-nano Application Technology Academician Workstation, Xinxiang University Xinxiang 453003 Henan China.
RSC Adv. 2023 Feb 14;13(9):5674-5686. doi: 10.1039/d2ra07726d.
As a decoration method, coupling a photocatalyst with semiconductor quantum dots has been proven to be an efficient strategy for enhanced photocatalytic performance. Herein, a novel BiOCl nanosheet decorated with BiO quantum dots (QDs) was first synthesized by a facile one-step chemical deposition method at room temperature. The as-prepared materials were characterized by multiple means of analysis. The BiOQDs with an average diameter of about 8.0 nm were uniformly embedded on the surface of BiOCl nanosheets. The obtained BiOQDs/BiOCl exhibited significantly enhanced photocatalytic performance on the degradation of the rhodamine B and ciprofloxacin, which could be attributed to the band alignment, the photosensitization effect and the strong coupling between BiO and BiOCl. In addition, the dye photosensitization effect was demonstrated by the monochromatic photodegradation experiments. The radical trapping experiments and the ESR testing demonstrated the type II charge transfer route of the heterojunction. Finally, a reasonable photocatalytic mechanism based on the relative band positions was discussed to illustrate the photoreaction process. These findings provide a good choice for the design and potential application of BiOCl-based photocatalysts in water remediation.
作为一种修饰方法，将光催化剂与半导体量子点耦合已被证明是提高光催化性能的有效策略。在此，首次通过简便的室温一步化学沉积法合成了一种用BiO量子点（QDs）修饰的新型BiOCl纳米片。通过多种分析手段对所制备的材料进行了表征。平均直径约为8.0 nm的BiO量子点均匀地嵌入在BiOCl纳米片的表面。所获得的BiO量子点/ BiOCl对罗丹明B和环丙沙星的降解表现出显著增强的光催化性能，这可归因于能带排列、光敏化效应以及BiO与BiOCl之间的强耦合。此外，通过单色光降解实验证明了染料光敏化效应。自由基捕获实验和电子顺磁共振测试证明了异质结的II型电荷转移途径。最后，基于相对能带位置讨论了合理的光催化机理，以阐明光反应过程。这些发现为基于BiOCl的光催化剂在水修复中的设计和潜在应用提供了良好的选择。
