Bi@Bi4Ti3O12/TiO2等离子体复合纤维的制备及增强可见光催化性能

Preparation and highly enhanced visible-light photocatalytic performances of Bi@Bi4Ti3O12/TiO2 plasmonic composite fibers

  • 摘要: 以电纺TiO2纳米纤维为基质和反应物、乙二醇为还原剂,采用溶剂热法原位合成了新型Bi@Bi4Ti3O12/TiO2等离子体复合纤维。利用XRD、SEM、高倍透射电子显微镜(HRTEM)、XPS、紫外-可见漫反射光谱(UV-Vis DRS)和光致发光图谱(PL)等分析测试手段研究了Bi@Bi4Ti3O12/TiO2复合纤维的结构和性能。结果表明:当反应温度低于210℃时,Bi@Bi4Ti3O12/TiO2复合纤维的Bi4Ti3O12纳米片随反应温度升高逐渐缩小、增厚,且有金属Bi纳米粒子生成;当反应温度高于210℃时,Bi@Bi4Ti3O12/TiO2复合纤维的纳米片发生堆积、变形、表面金属Bi被氧化成Bi2O3。反应温度对Bi@Bi4Ti3O12/TiO2等离子体复合纤维的形貌和物相组成有重要影响;Bi@Bi4Ti3O12/TiO2复合纤维对罗丹明B表现出优异的光催化活性,可见光照5 h其降解率达97.8%。Bi@Bi4Ti3O12/TiO2复合纤维光催化性能提高归结于Bi4Ti3O12与TiO2间形成异质结、金属Bi等离子体共振效应及等离子体共振效应与异质结的协同作用。

     

    Abstract: A novel Bi@Bi4Ti3O12/TiO2 plasmonic composite fibers was synthesized in situ by solvothermal method using electrospun titanium dioxide nanofibers as matrix and reactant, and ethylene glycol as reductant. The XRD, SEM, high power transmission electron microscope (HRTEM), XPS, UV-visible diffuse-reflectance spectrum and photoluminescence (PL) spectra were employed to explore the structural and properties of Bi@Bi4Ti3O12/TiO2 composite fiber. The results indicate that when the reaction temperature is lower than 210℃, the Bi4Ti3O12 nanosheets on the surface of Bi@Bi4Ti3O12/TiO2 composite fiber become smaller and thicker gradually with the increasing reaction temperature, and a large number of metal Bi nanoparticles are evenly formed. When the reaction temperature is higher than 210℃, not only the nanosheets accumulate and deform, but also the metal Bi on the surface is oxidized to Bi2O3. The Bi@Bi4Ti3O12/TiO2 composite fiber showed excellent photocatalytic efficiency for the degradation of Rhodamine B, with a Rhodamine B degradation rate of 97.8% after visible light irradiation for 5 h. Adjusting reaction temperature not only exerts a pivotal effect on the morphological structure and phase composition, but also affects the photocatalytic capability of the Bi@Bi4Ti3O12/TiO2 plasmonic composite fibers. The improvement of visible-light photocatalytic performance of Bi@Bi4Ti3O12/TiO2 composite fiber is mainly attributed to the formation of high-quality heterojunctions between Bi4Ti3O12 and TiO2, the plasma resonance effect of metal Bi, and the synergistic effect of plasma resonance effect and heterojunction.

     

/

返回文章
返回