Citric acid-modulated in situ synthesis of 3D hierarchical Bi@BiOCl microsphere photocatalysts with enhanced photocatalytic performance
- 652 Downloads
3D hierarchical Bi@BiOCl microspheres were successfully synthesized by a facile solvothermal method using citric acid as a modulating agent and the growth process was revealed. The modulation of citric acid not only reduced the size of BiOCl nanosheets, finally transforming BiOCl microflowers into microspheres, but also induced the in situ reductive deposition of metallic Bi on the surface of the microspheres. Consequently, Bi@BiOCl microspheres showed larger specific surface areas and total pore volumes, higher absorptivity to the visible light and better charge transfer ability than BiOCl microflowers. As a result, Bi@BiOCl microspheres exhibited much better photocatalytic performance than BiOCl microflowers. Bi@BiOCl microspheres modulated by 2.8 g citric acid showed the highest photocatalytic activity, which was 4.4 and 2.5 times higher than BiOCl microflowers in degrading RhB under visible light and salicylic acid under UV light, respectively. This work may provide a new insight into simultaneous size control and in situ metal deposition for Bi-containing photocatalysts and other materials.
This work was supported by National Natural Science Foundation of China (21276104 and 21706091) and GuangDong Provincial Department of Science and Technology Application Research and Development Supporting Special Fund Project (2015B020235007).
Compliance with ethical standards
Conflict of interest
We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
- 6.He RA, Cao SW, Yu JG (2016) Recent advances in morphology control and surface modification of Bi-based photocatalysts. Acta Phys Chim Sin 32(12):2841–2870Google Scholar
- 11.Ding LY, Wei RJ, Chen H, Hu JC, Li JL (2015) Controllable synthesis of highly active BiOCl hierarchical microsphere self-assembled by nanosheets with tunable thickness. Appl Catal B-Environ 172–173:91–99Google Scholar
- 13.Zhao S, Zhang YW, Zhou YM, Fang JS, Wang YY, Zhang C, Chen WX (2018) Fabrication of sandwich-structured g-C3N4/Au/BiOCl Z-scheme photocatalyst with enhanced photocatalytic performance under visible light irradiation. J Mater Sci 53(8):6008–6020. https://doi.org/10.1007/s10853-018-1995-z CrossRefGoogle Scholar