Abstract
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.
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