Ionic liquid induced mechanochemical synthesis of BiOBr ultrathin nanosheets at ambient temperature with superior visible-light-driven photocatalysis
| Autor: | Yi Zhang, Kai Li, Qi Jiang, Zhigang Chen, Mengxia Ji, Chenxi Meng, Rong Chen, Jiexiang Xia, Huaming Li |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Diffusion 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering Transmission electron microscopy Ionic liquid Photocatalysis Charge carrier 0210 nano-technology Ball mill Nanosheet Visible spectrum |
| Zdroj: | Journal of Colloid and Interface Science. 574:131-139 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2020.04.018 |
| Popis: | Ultrathin BiOBr nanosheets have been prepared via an ionic liquid induced mechanochemical synthesis method at ambient temperature for the first time using 1-hexadecyl-3-methy-limidazolium bromine ([C16mim]Br). Transmission electron microscope and atomic force microscope images show that the ultrathin BiOBr nanosheets possessed an average diameter of approximately 200–300 nm with a thickness of 3–4 nm. For comparison, KBr was selected as Br source for the preparation of BiOBr nanosheets and the experimental results demonstrate that the ionic liquid and mechanical ball milling method had a significant impact on the fabrication of nanosheet structures. Compared with the as-prepared control samples, the ultrathin BiOBr nanosheet photocatalyst exhibited significantly increased photocatalytic performance for the removal of organic pollutants. A possible mechanism for this enhanced activity was proposed based on the shorter diffusion distance for charge transfer provided by the ultrathin nanosheet structure, which inhibits the recombination of photogenerated charge carriers. This work not only opens up a possible pathway for the large-scale industrial preparation of BiOX (X = Cl, Br, I) with superior photocatalytic activity, but also provides new insight into environmental restoration and energy conversion. |
| Databáze: | OpenAIRE |
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