Li Cong-Ju, Wang Jiao-Na, Wang Bin, Gong Jian Ru, Lin Zhang
Beijing Key Laboratory of Clothing Materials R&D and Assessment, Beijing Institute of Fashion Technology, Beijing 100029, PR China.
J Nanosci Nanotechnol. 2012 Mar;12(3):2496-502. doi: 10.1166/jnn.2012.5812.
A reusable photocatalytic TiO2/CoFe2O4 composite nanofiber was directly formed by using a vertical two-spinneret electrospinning process and sol-gel method, followed by heat treatment at 550 degrees C for 2 h. The high photocatalytic activity of the composite nanofibers depends on the good morphology of the fibers and the appropriate calcination temperature. The crystal structure and magnetic properties of the fibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The photocatalytic activity of the TiO2/CoFe2O4 fibers was investigated through ultraviolet-visible absorbance following the photo-oxidative decomposition of phenol. Meanwhile, the presence of CoFe2O4 not only broadens the response region of visible light, but also enhances the absorbance of UV light. Furthermore, these fibers displayed photocatalytic activity associated with magnetic activity of CoFe2O4 ferrites, allowing easy separated of the photocatalysts after the photo-oxidative process and effectively avoided the secondary pollution of the treated water.
通过垂直双喷头静电纺丝工艺和溶胶 - 凝胶法直接制备了一种可重复使用的光催化TiO2/CoFe2O4复合纳米纤维，随后在550℃下热处理2小时。复合纳米纤维的高光催化活性取决于纤维良好的形态和适当的煅烧温度。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱（EDS）、透射电子显微镜（TEM）和振动样品磁强计（VSM）对纤维的晶体结构和磁性进行了表征。通过苯酚光氧化分解后的紫外 - 可见吸收研究了TiO2/CoFe2O4纤维的光催化活性。同时，CoFe2O4的存在不仅拓宽了可见光的响应区域，还增强了紫外光的吸收。此外，这些纤维表现出与CoFe2O4铁氧体的磁活性相关的光催化活性，使得光氧化过程后光催化剂易于分离，并有效避免了处理后水的二次污染。
