The preparation of coupled WO 3/TiO 2 photocatalyst by ball milling
The preparation of coupled WO 3/TiO 2 photocatalyst by ball milling
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DOI：
10.1016/j.powtec.2005.08.012
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发表时间：
2005-12
影响因子：
5.2
通讯作者：
Shifu Chen;Lei Chen;Gao Shen;Geng‐yu Cao
中科院分区：
文献类型：
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作者：
Shifu Chen;Lei Chen;Gao Shen;Geng‐yu Cao
以水溶液为分散剂，采用球磨法将WO 3掺杂到TiO 2中，制备了复合光催化剂WO 3/TiO 2。采用紫外-可见漫反射光谱、X射线光电子能谱（XPS）、X射线粉末衍射（XRD）和透射电子显微镜（TEM）对复合光催化剂进行了表征。结果表明，WO 3的最佳掺杂量为3%;复合WO 3/TiO 2光催化剂的光催化活性远高于未球磨的TiO 2和WO 3-TiO 2。与TiO 2相比，WO 3/TiO 2光催化剂的光激发波长范围红移约50 nm，光吸收强度也有所提高。在球磨过程中，TiO 2的晶相没有发生变化，也没有发现新的晶相。WO 3与TiO 2高度耦合，形成WO 3/TiO 2光催化剂。复合光催化剂的光催化活性的提高可能是由于电荷分离效率的提高和光激发波长范围的扩大。
The coupled photocatalyst WO3/TiO2is prepared by ball milling by doping WO3into TiO2and using H2O solution as disperser. The coupled photocatalyst WO3/TiO2is characterized by UV–VIS diffuse reflection spectrum, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and Transmission electron microscopy (TEM). The results show that the optimum percentage of WO3doped is 3% and that the photocatalytic activity of the coupled WO3/TiO2photocatalyst is much higher than that of TiO2and WO3–TiO2with no ball milling. Compared with TiO2, the photoexcited wavelength range of the WO3/TiO2photocatalyst red-shifts about 50 nm, and the light absorption intensity is also improved. The crystal phase of TiO2is not changed and new crystal phases are not found during the process of ball milling. WO3and TiO2coupled highly, forming the WO3/TiO2photocatalyst. The increased photocatalytic activity of the coupled photocatalyst may be attributed to the enhance charge separation efficiency and the extend wavelength range of photoexcitation.