Bi掺杂的SrTiO3的制备及其可见光催化活性研究

摘要

Objective:To study the visible light photocatalytic activity of Bi-doped SrTiO3.Methods:Bismuth(Bi)doped strontium titanate(SrTiO3)nanometer powders with different ratios of Bi were synthesized by chemical coprecipitation method.The structure of the photocatalytic catalysts was characterized by XPS,XRD,HRTEM,and UV-vis DRS.When Rhodamine B(RhB)was used as the model pollutant,and 1 000 W halogen lamp(λ>420 nm)as visible light source,the effects of different doping amount of Bi on the photocatalytic activity of SrTiO3was investigated.Results:An appropriate amount of Bi doping to SrTiO3can improve the visible light photocatalytic activity of SrTiO3,and 3 wt.% Bi-SrTiO3has the highest visible light photocatalytic activity for the degradation of RhB. Conclusion: The doping of Bi can extend the visible light response range, and significantly improve the visible light photocatalytic activity of SrTiO3.%目的:探讨铋(Bi)掺杂的钛酸锶(SrTiO3)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SrTiO3纳米粉体(Bi-SrTiO3),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(RhB)为模型污染物,1000 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SrTiO3的可见光催化活性的影响.结果:适量的Bi掺杂到SrTiO3中能提高SrTiO3的可见光催化活性,其中Bi的掺杂量为3%时Bi-SrTiO3具有最高的可见光催化活性.结论:Bi的掺杂能扩大SrTiO3的可见光响应范围,显著提高SrTiO3的可见光催化活性.