College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
J Colloid Interface Sci. 2019 Apr 1;541:123-132. doi: 10.1016/j.jcis.2019.01.072. Epub 2019 Jan 18.
Bismuth vanadate (BiVO) as a visible-light photocatalyst is always restricted by rapid photoexcited electron-hole recombination. Hence, the construction of charge transfer path is an essential strategy to establish an efficient photocatalytic system. Notably, the nitrogen doped carbon quantum dots (N-CQDs) exhibit potential for application in photocatalysis due to its high charge transfer capability and molecular oxygen activation ability. In this work, a Z-scheme BiVO/N-CQDs/CuO system with enhanced molecular oxygen activation ability was constructed. Under the optimum condition, the BiVO/N-CQDs/CuO composite showed 99.1% tetracycline hydrochloride (TC) removal efficiency under visible light irradiation in 60 min. The N-CQDs provide a potential driving force to reestablish the local electric field and lead to the construction of the Z-scheme BiVO/N-CQDs/CuO system. And the excellent photocatalytic performance of this system was ascribed to the greatly enhanced molecular oxygen activation by contacting N-CQDs and the construction of Z-scheme system. Furthermore, the visible light absorption capability was obviously improved due to the fact that CuO provided multiple reflection of visible light and the N-CQDs act as a photosensitizer. Noteworthily, this study may help to further understand the function of N-CQDs in heterojunction and it could be expanded to design other photocatalysts.
钒酸铋（BiVO）作为可见光光催化剂，其光激发电子-空穴复合较快，一直受到限制。因此，构建电荷转移路径是建立高效光催化体系的重要策略。值得注意的是，由于具有高电荷转移能力和分子氧活化能力，氮掺杂碳量子点（N-CQDs）在光催化中具有应用潜力。在这项工作中，构建了具有增强分子氧活化能力的 Z 型 BiVO/N-CQDs/CuO 体系。在最佳条件下，BiVO/N-CQDs/CuO 复合材料在可见光照射下 60 分钟内对盐酸四环素（TC）的去除率达到 99.1%。N-CQDs 提供了重建局部电场的潜在动力，并导致 Z 型 BiVO/N-CQDs/CuO 体系的构建。该体系具有优异的光催化性能，归因于与 N-CQDs 接触和构建 Z 型体系大大增强了分子氧的活化。此外，由于 CuO 提供了可见光的多次反射，并且 N-CQDs 充当光致剂，因此可见光吸收能力明显提高。值得注意的是，本研究可能有助于进一步了解 N-CQDs 在异质结中的作用，并可扩展到设计其他光催化剂。
