Bi掺杂的SrTiO_3的制备及其可见光催化活性研究

A Study on the Synthesis and Visible Light Photocatalytic Activity of Bismuth-doped Strontium Titanate

目的:探讨铋(Bi)掺杂的钛酸锶(SrTiO_3)的可见光催化活性。方法:采用化学共沉淀法合成了不同掺Bi比例的SrTiO_3纳米粉体(Bi-SrTiO_3),通过X射线光电子能谱(XPS)、X射线粉末衍射仪(XRD)、高分辨透射电镜(HRTEM)和固体紫外-可见漫反射光谱(UV-Vis DRS)对催化剂进行了结构、形貌和光谱性质的表征。以罗丹明B(Rh B)为模型污染物,1 000 W卤钨灯为光源(用滤光片滤去波长小于420 nm的光),考察Bi的不同掺杂量对SrTiO_3的可见光催化活性的影响。结果:适量的Bi掺杂到SrTiO_3中能提高SrTiO_3的可见光催化活性,其中Bi的掺杂量为3%时Bi-SrTiO_3具有最高的可见光催化活性。结论:Bi的掺杂能扩大SrTiO_3的可见光响应范围,显著提高SrTiO_3的可见光催化活性。

Objective： To study the visible light photocatalytic activity of Bi-doped SrTiO_3. Methods： Bismuth（Bi）doped strontiumtitanate（SrTiO_3）nanometer powders with different ratios of Bi were synthesized by chemical coprecipitation method. The structure ofthe photocatalytic catalysts was characterized by XPS, XRD, HRTEM, and UV-vis DRS. When Rhodamine B（Rh B）was used as themodel pollutant, and 1 000 W halogen lamp（λ420 nm）as visible light source, the effects of different doping amount of Bi on thephotocatalytic activity of SrTiO_3 was investigated. Results： An appropriate amount of Bi doping to SrTiO_3 can improve the visible lightphotocatalytic activity of SrTiO_3, and 3 wt. % Bi-SrTiO_3 has the highest visible light photocatalytic activity for the degradation of Rh B.Conclusion： The doping of Bi can extend the visible light response range, and significantly improve the visible light photocatalyticactivity of SrTiO_3.