In situ preparation of visible-light-driven carbon quantum dots/NaBiO3 hybrid materials for the photoreduction of Cr(VI)
| Autor: | Shaobin Huang, Lishan Niu, Xuesong Zhao, Gongchang Zeng, Yixiao Wu, Chun-Long Chen, Ying Cao, Yingying You, Shu He |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Environmental Engineering Materials science Nanoparticle 02 engineering and technology General Medicine Electron acceptor 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Nanomaterials chemistry.chemical_compound Chemical engineering chemistry Photocatalysis Environmental Chemistry Hexavalent chromium 0210 nano-technology Hybrid material General Environmental Science Visible spectrum |
| Zdroj: | Journal of Environmental Sciences. 99:100-109 |
| ISSN: | 1001-0742 |
| DOI: | 10.1016/j.jes.2020.06.016 |
| Popis: | In this study, different carbon quantum dots (CQDs)/NaBiO3 hybrid materials were synthesized as photocatalysts to effectively utilize visible light for the photocatalytic degradation of contaminants effectively. These hybrid materials exhibit an enhanced photocatalytic reduction of hexavalent chromium (Cr(VI)) in the aqueous medium. Zero-dimensional nanoparticles of CQDs were embedded within the two-dimensional NaBiO3 nanosheets by the hydrothermal process. Compared with that of the pure NaBiO3 nanosheets, the photocatalytic performance of the hybrid catalysts was significantly high and 6 wt.% CQDs/NaBiO3 catalyst exhibited better photocatalytic performance. We performed the first-principles density functional theory calculations to study the interfacial properties of pure NaBiO3 nanosheets and hybrid photocatalysts, and confirmed the CQDs played an important role in the CQDs/NaBiO3 composites. The experimental results indicated that the enhanced reduction of Cr(VI) was probably due to the high loading of CQDs (electron acceptor) on NaBiO3, which made NaBiO3 nanomaterials to respond in visible light and significantly improved their electron-hole separation efficiency. |
| Databáze: | OpenAIRE |
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