Regulation of visible-light-driven photocatalytic degradation of Rhodamine B on BiOBr via zeta potential
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In this paper, bismuth oxybromide (BiOBr) photocatalysts were synthesized in the presence of tetrabutylammonium bromide (TBAB) at the different volume fractions of ethanol/water and named as BiOBr0, BiOBr20, BiOBr50, BiOBr80 and BiOBr100, respectively. The samples were characterized and applied to the degradation of Rhodamine B (RhB) under visible-light irradiation (λ ≥ 420 nm). The results indicated that both TBAB and ethanol significantly affected the crystal phase, morphology and surface charge distribution of BiOBr. The exposed (110) faces of BiOBr with Bi3+ sites contributed to its photocatalytic activity via the enhanced separation of electrons and photogenerated holes as well as the better photo-stability. BiOBr50 showed the optimal activity for the photodegradation of RhB. Superoxide radical (O2·−) as the dominant active species was responsible for the degradation of RhB.
KeywordsBiOB Photocatalytic activity Zeta potential Ethanol
This work was financially supported by the National Natural Science Foundation of China (21677086, 21577078), Hubei Innovation Group Project (2015CFA021), The 111 Project of Hubei Province (2018-19-1), China Postdoctoral Science Foundation (2018M640721) and Master Education Fund of China Three Gorges University (2018SSPY143).
- 17.P.X. Liu, Y. Zhao, R. Qin, S. Mo, G. Chen, L. Gu, D.M. Chevrier, P. Zhang, Q. Guo, D. Zang, B.H. Wu, G. Fu, N.F. Zheng, Science 797, 352 (2016)Google Scholar