静电纺丝法制备V2O5微纳米棒及光催化性能

摘要

以聚乙烯吡咯烷酮(PVP)和偏钒酸铵(NH4VO3)为原料,利用静电纺丝技术结合溶胶过程制备PVP/NH4VO3纤维,对纤维缓慢控温处理制备V2O5微纳米棒.采用热重-差热分析(TG-DTA)、X射线衍射光谱(XRD)、傅立叶红外光谱(FT-IR)、场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis)技术手段对V2O5微纳米棒的结构和表面形态进行表征.以亚甲基蓝(MB)的光降解为模型反应,研究V2O5微纳米棒的光催化性能.结果表明:热处理温度对催化剂表面形态和晶相的生长有明显影响,550℃煅烧的V2O5微纳米棒在可见光区对MB的光降解效率最高,并分析和探讨了可能的光催化机理.%V2O5 micro-nanorods were fabricated via calcining the as-synthesized precursors prepared by electrospinning technique route using NH4VO3 and PVP as regent. The physicochemical properties of the catalysts were characterized by Thermogravimetric and Differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectra (UV-Vis). The photocatalytic activity of V2O5 micro-nanorod toward the decomposition of Methylene Blue (MB) was investigated. The results indicated that calcination temperature had a great influence on the morphologies and crystalline phases of the micro-nanorod. 550 °C micro-nanorod exhibited the highest activity for degrading MB under Visible light, and the photocatalytic mechanism of V2O5 micro-nanorod was also presented.