Bi@Bi2Sn2O7/TiO2等离子体复合纤维的制备及增强的光催化产氢活性

Preparation of Bi@Bi2Sn2O7/TiO2 Plasmonic Composite Fibers with Enhanced Photocatalytic Hydrogen Generation Activity

以电纺TiO2纳米纤维为基质,采用一步水热法合成了Bi@Bi2Sn2O7/TiO2等离子体复合纤维光催化剂。利用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)、紫外-可见漫反射(UV-Vis DRS)和光致发光光谱(PL)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。以三乙醇胺为电子给体,研究了Bi@Bi2Sn2O7/TiO2复合纤维光催化裂解水制氢的反应过程。结果表明:在水热过程中,Bi2Sn2O7构筑在TiO2纳米纤维表面形成p-n结的同时,部分Bi^3+被葡萄糖还原成金属Bi沉积在Bi2Sn2O7上。金属Bi的等离子体共振效应与p-n结的协同作用,有效提高了样品的光催化活性,产氢速率达到7.26 mmol·h^-1·g^-1。

By employing electrospun TiO2 nanofiber as substrate,Bi@Bi2Sn2O7/TiO2 plasmonic composite fibers were prepared via one-step hydrothermal method.The composition,morphology and optical properties were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),scanning electron microscope (SEM),high-resolution transmission electron microscope (HRTEM),ultraviolet-visible diffuse reflection spectra (UV-Vis DRS) and photoluminescence spectroscopy (PL) analysis.The photocatalytic water splitting for hydrogen evolution was investigated over Bi@Bi2Sn2O7/TiO2 plasmonic composite fibers with triethanolamine as the donor residue.The results showed that the Bi nanoparticles were generated onto Bi2Sn2O7 nanoparticle via the in situ reduction of Bi^3+ by glucose,meanwhile grew on the TiO2 nanofibers surface.The enhanced photocatalytic activity of the Bi@Bi2Sn2O7/TiO2 plasmonic composites fibers can be further improved mainly attributed to the formation of high-quality p-n heterojunctions between Bi2Sn2O7 and titanium dioxide,the plasma resonance effect of metal bismuth,and the synergistic effect of plasma resonance effect and p-n heterojunction.The corresponding H2 production rate was 7.26 mmol·h^-1·g^-1.