中文摘要：

在室温条件下通过沉积法制备了BiOI敏化纳米锐钛矿TiO2 （A）光催化剂. 用X射线衍射（XRD）,X射线光电子能谱（XPS）, 光致发光（PL）光谱和紫外-可见漫反射（UV-Vis DRS）等手段对其进行了表征. 通过罗丹明B（RhB）催化降解实验评价了其光催化活性. 随BiOI含量增加, BiOI/TiO2 （A）在370-630 nm的吸收强度增强, 吸收带边红移增加, 紫外和可见光催化活性先增加, 当BiOI含量约为1.7% （质量分数）时, 各自达到最大值, 然后随BiOI含量的进一步增加而减小. 1.7% BiOI/TiO2 （A）的可见光活性明显高于P25, 它的紫外光活性也略高于P25. 在BiOI含量相近时, BiOI/TiO2 （A）比BiOI/P25具有更低的光催化活性. 和TiO2 （A）相比, 1.7% BiOI/TiO2 （A）明显具有更高的紫外和可见光催化活性, 这归功于它在370-630 nm的强吸收、吸收带边红移明显以及光生电子和空穴的有效转移, 减少了电子-空穴对的复合.

英文摘要：

BiOI-sensitized nano-anatase （TiO2 （A）） photocatalysts were prepared by a deposition method at room temperature, and characterized by X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, and photoluminescence （PL）, and UV-Vis diffuse reflectance spectra （UV-Vis DRS）. The photocatalytic activities were evaluated by photo-degradation experiments of rhodamine B. With increasing BiOI content, the absorption intensity of BiOI/TiO2 （A） increases in the 370-630 nm region and the absorption band edge redshifts. The UV and visible light photocatalytic activities increase, reaching a maximum when the Bi/Ti molar ratio is 1.7% . The 1.7% BiOI/TiO2 （A） catalyst exhibits much higher visible-light photoactivity than P25, and its UV-light photoactivity is slightly higher than that of P25. The UV and visible light photocatalytic activities of BiOI/TiO2 （A） with similar BiOI content are lower than those of BiOI/P25 catalysts. Compared with TiO2 （A）, 1.7% BiOI/TiO2 （A） shows higher UV and visible light photoactivities. This is attributed to the strong absorption in the 370-630 nm region, the redshift of the absorption band edge, and the effective transfer of the photogenerated electrons and holes, which reduces the recombination of electron-hole pairs.