Photoinduced Charge Transfer Properties and Photocatalytic Activity in Bi2O3/BaTiO3 Composite Photocatalyst
Photoinduced Charge Transfer Properties and Photocatalytic Activity in Bi2O3/BaTiO3 Composite Photocatalyst
复制标题
Bi2O3/BaTiO3 复合光催化剂的光致电荷转移性能和光催化活性
DOI：
10.1021/am301199v
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发表时间：
2012-09-01
影响因子：
9.5
通讯作者：
Wang, Dejun
中科院分区：
文献类型：
--
作者：
Fan, Haimei;Li, Haiyan;Wang, Dejun
采用煅烧-退火法制备了一系列Bi 2 O3/BaTiO 3复合光催化剂，并考察了Bi 2 O3/BaTiO 3复合光催化剂的光催化活性。X射线衍射（XRD）、高分辨透射电子显微镜（HRTEM）和紫外-可见漫反射光谱（DRS）分析表明，复合材料中Bi 2 O3和BaTiO 3共存。表面光电压（SPV）实验结果表明，复合材料的光伏响应增强，表明复合材料中Bi 2 O3和BaTiO 3之间建立了有效的界面电场，从而提高了光生电荷的分离效率。光催化活性与光伏响应强度的一致性表明，Bi 2 O3与BaTiO 3之间的有效界面电场对提高罗丹明B（RhB）的降解效率起着重要作用。通过优化Bi_2O_3与BaTiO_3的质量比，找到了具有最佳活性的60%-Bi_2O_3/BaTiO_3样品。在功函数（WF）测量的基础上，提出了BaTiO 3/Bi 2 O3复合材料的合理能带图。这将有助于设计和构建高效的多相半导体光催化剂。
A series of Bi2O3/BaTiO3 composite photocatalysts with different mass ratios of Bi2O3 vs BaTiO3 were prepared by an impregnating-annealing method. X-ray diffraction (XRD), high-resolution transmission electron microscopic (HRTEM), and UV-vis diffuse reflection spectroscopy (DRS) confirmed that Bi2O3 and BaTiO3 coexisted in the composites. The results of surface photovoltage (SPV) experiments showed enhancements of photovoltaic response in composites, which indicated a higher separation efficiency of photoinduced charges due to the establishment of an efficient interfacial electric field between Bi2O3 and BaTiO3 in the composites. The consistency of phtocatalytic activity and photovoltaic response intensity of photocatalysts showed that the efficiency interfacial electric field between Bi2O3 and BaTiO3 played an important role in improving the degradation efficiency of Rhodamine B (RhB). The 60%-Bi2O3/BaTiO3 sample with the best activity was found by optimizing the mass ratios of Bi2O3 vs. BaTiO3. On the basis of the work function (WF) measurements, a reasonable energy band diagram was proposed for BaTiO3/Bi2O3 composite. It would be helpful in designing and constructing high efficiency heterogeneous semiconductor photocatalyst.