Gd-N共掺杂SrTiO3/TiO2复合纳米纤维制备及光催化性能
Preparation and Photocatalytic Activity of Gd-N Co-doped SrTiO3/TiO2 Composite Nanofibers
作者单位E-mail
李跃军 白城师范学院, 纳米光催化材料研究中心, 白城 137000  
曹铁平 白城师范学院, 纳米光催化材料研究中心, 白城 137000 bcctp2008@163.com 
梅泽民 白城师范学院, 纳米光催化材料研究中心, 白城 137000  
李晓萍 白城师范学院, 纳米光催化材料研究中心, 白城 137000  
孙大伟 白城师范学院, 纳米光催化材料研究中心, 白城 137000  
杨殿凯 白城师范学院, 纳米光催化材料研究中心, 白城 137000  
摘要: 以静电纺丝技术制备的TiO2纳米纤维为基质和反应物,结合一步水热法制得Gd-N共掺杂SrTiO3/TiO2复合纳米纤维光催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)、X射线光电子能谱(XPS)、紫外-可见漫反射(UV-Vis DRS)和荧光光谱(PL)等方法对其微观结构、形貌和光学性能进行表征。结果表明:SrTiO3和TiO2形成异质结能够使光生电子和空穴得到很好的分离,而Gd-N共掺杂产生新带隙,可以拓宽光谱响应范围至可见光区,并引起晶格缺陷,成为光生电子-空穴对的浅势捕获阱。Gd-N共掺杂与异质结的协同作用有效提高了SrTiO3/TiO2复合纳米纤维的可见光催化活性。
关键词: Gd-N共掺杂SrTiO3/TiO2  复合纳米纤维  一步水热法  光催化
基金项目: 国家自然科学基金(No.21573003)和吉林省自然科学基金(No.20140101118JC)资助。
Abstract: Gd and N co-doped SrTiO3/TiO2 composite nanofibers were prepared via one step hydrothermal synthesis growth of SrTiO3 nanostructures using electrospun anatase TiO2 nanofibers as both substance and reactant. The phase composition, microstructure, morphology and optical properties of the sample were characterized by X-ray diffraction (XRD), scanning electron mictoscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectroscopy (PL). The results indicated that the heterostructure formed by SrTiO3 and TiO2, plays an important role in the suppression of electron-hole recombination and improves the photocatalytic performance of TiO2 nanofibers. The excellent visible light photocatalytic activity of this substance may be due to the generation of a new band gap that enables the catalyst to absorb visible light and results in the lattice defects which acts as a recombination center of photoinduced electrons and holes. The synergistic effect of Gd-N co-doping and heterojunction could effectively improve the visible-light photocatalytic activity of SrTiO3/TiO2 composite nanofibers.
Keywords: Gd-N co-doped SrTiO3/TiO2  composite nanofibers  one step hydrothermal method  photocatalysis
投稿时间:2018-09-09 修订日期:2018-11-06
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李跃军,曹铁平,梅泽民,李晓萍,孙大伟,杨殿凯.Gd-N共掺杂SrTiO3/TiO2复合纳米纤维制备及光催化性能[J].无机化学学报,2019,35(1):82-88.
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