Notice of RetractionPhotocatalytic Degradation of Rhodamine B by BiOX (X=Cl, Br, I) Microspheres

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A series of flower-shaped BiOX (X=Cl, Br, I) microspheres were synthesized via facile solvothermal method using Bi(NO₃)₃·5H₂O as Bi source. The catalysts were subsequently characterized by XRD, SEM, UV-Vis diffuse reflectance spectra and N₂ adsroption-desorption techniques. The synthesized BiOX (X=Cl, Br, I) photocatalysts were microspheres composed of nanosheets, while BiOI microspheres were more hierarchical in shape. The UV-Vis diffuse reflectance spectra revealed that the estimated band gap energies were approximately 3.15, 2. 76 and 1.80 eV for BiOCl, BiOBr and BiOI, respectively. The photocatalytic activity of the BiOX (X=Cl, Br, I) microspheres were evaluated by degrading Rhodamine B (RhB) under simulated solar light irradiation. BiOl showed the best photocatalytic performance, which can be ascribed to the combined effect of its hierarchical structure and excellent optical properties. These catalysts are promising to be employed for dye-containing wastewater treatment.