Abstract
Highly efficient novel photocatalysts BiOBr/Bi2O3 with various proportion of BiOBr were synthesized via accommodating the pH value of solution and were applied to decontaminate methyl orange (MO) and methylene blue (MB). The samples were characterized by Fourier transform infrared spectrophotometry (FT-IR), X-ray diffractometry (XRD), Scanning electron microscopy (SEM), UV–vis diffuse reflectance spectra, and N2 physisorption. Though both the individual BiOBr and Bi2O3 showed very low photocatalytic efficiency under visible light irradiation, the BiOBr/Bi2O3 composites exhibited superior activity for MO and MB under visible light, and 75% BiOBr/Bi2O3 (pH = 6) composite showed the highest degradation rate, which was 1.4 times than that of pure BiOBr. The photocatalytic activity investigating on MB also showed a same result. In addition, the catalyst can be separated easily for reuse and no obvious loss of photocatalytic activity were observed after three consecutive runs.
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