铋复合Nd^3+:TiO2纳米纤维制备及其光催化产氢性能

Preparation of Bismuth Composite Nd^3+:TiO2 Nanofibers and Photocatalytic Hydrogen Production

以静电纺丝技术制备的稀土Nd3+掺杂TiO2纳米纤维为基质,结合水热法制备了Bi/Nd^3+: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)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和瞬时光电流(IP)等分析测试手段对样品的物相、形貌和光电性能等进行表征。以三乙醇胺为牺牲剂,研究了Bi/Nd^3+:TiO2可见光催化产氢过程。结果表明:Bi作为一种新兴的非贵金属具有独特的等离子体光催化或辅助光催化性能,将其与稀土元素丰富的能级结构和4f电子跃迁特性相结合,对TiO2进行双重修饰改性,有效提高了TiO2的光催化活性和稳定性,可见光照射下产氢速率达到49.2μmol·g^-1·h^-1。

By employing electrospun rare earth dysprosium doped TiO2 nanofibers as substrate,Bi composite Nd^3+:TiO2 nanofibers were prepared combining with hydrothermal method.The composition,morphology and photoelectric properties were characterized by X-ray diffraction(XRD),X-ray photoelectric spectroscopy(XPS),scanning electron microscopy(SEM),transmission electronmicroscopy(TEM),UV-vis diffuse reflection spectrum(UV-vis DRS)and instantaneous photocurrent.The photocatalytic water splitting for hydrogen evolution was investigated over Bi/Nd^3+:TiO2 nanofibers with triethanolamine as the donor residue.The results showed that metal bismuth is an emerging non-noble metal-based plasmonic metal,which demonstrated exceptional behaviors as a unique plasmonic photocatalyst or cocatalyst.The double modification of TiO2 nanofibers by the plasma resonance effect of metal Bi and combined with rare earth element has rich energy level structure and 4 f electron transition characteristics,which effectively improved the photocatalytic activity and stability of the samples under visible light.The highest hydrogen production rate was 49.2μmol·g^-1·h^-1.