采用静电纺丝技术与溶剂热法相结合制备了γ-Bi2O3/TiO2 复合纤维光催化材料. 利用X射线衍射(XRD)、扫描电镜(SEM)、电子能谱(EDS)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和紫外–可见吸收光谱(UV-Vis)等分析测试手段对材料进行了表征, 并以罗丹明Ｂ(RB)的脱色降解为模式反应, 考察了材料的可见光催化性能. 结果表明: γ-Bi2O3纳米片均匀地生长在TiO2纤维上, 形成了具有异质结构的γ-Bi2O3/TiO2复合纤维光催化材料, 其光谱响应范围拓宽至可见光区, 有利于TiO2光生电子和空穴的分离, 增强了体系的量子效率. 与纯TiO2纤维相比可见光催化活性明显提高, 对RB的脱色率达87.8%.
Heterostructured γ-Bi2O3/TiO2 composite fibers were prepared via combination of solvothermal method and electrospinning technique. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscope (EDS), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM) and UV-Vis absorption spectra were used to characterize heterostructured γ-Bi2O3/TiO2 composite fibers. The photocatalytic properties of the heterostructured samples were evaluated by degrading rhodamine B (RB) under visible light irradiation. The results showed that γ-Bi2O3 nanosheets could evenly grow on the TiO2 fibers surface and thus heterostructured γ-Bi2O3/TiO2 composite fibers were successfully obtained. The absorption range of the as-obtained heterostructured samples were extended to the visible light region. Moreover, the presence of γ-Bi2O3 nanostructures/TiO2 fibers heterostructures was beneficial to separation of photo-generated electrons and holes which enhanced the system’s quantum efficiency. In comparison with that of pure TiO2 nanofibers, the γ-Bi2O3/TiO2 heterostructures have enhanced photocatalytic efficiency under visible light irradiation, and the decolorizing efficiency of RB solution can reach 87.8%.
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