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Novel, three-dimensional, flower-like Bi_2O_3/BiVO_4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution of Na OH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV–vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic activities of samples were evaluated on the degradation of methyl orange(MO) under visible-light irradiation. The Bi_2O_3/BiVO_4 exhibited much higher photocatalytic activities than pure Bi VO_4 and conventional Ti O_2(P25). The result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced photocatalytic activity.
Novel, three-dimensional, flower-like Bi_2O_3 / BiVO_4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal methods followed by thermal solution of Na OH etching process. The as-obtained samples were fully characterized by X- ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV-vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and photocatalytic activity of samples greatly changed The photocatalytic activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The Bi_2O_3 / BiVO_4 shows much higher photocatalytic activities than pure Bi VO_4 and conventional Ti O_2 (P25). The result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced photocatalytic activity.