Study On Preparation And Application Of TiO₂ Nanofibers By Electrospinning

The fiber rope of PVP was fabricated by electrospinning. Two parallel upright copper threads were used as the acceptors. Poly (vinyl pyrrolidone) (PVP) sol (10% in ethano1) was electrospun at the voltage of 25 kV. The fiber rope of PVP was fabricated with the rotation speed of 0～600 r/min. The Coulomb attracting force(in the vertical direction due to the static fields between the jet and the copper thread) and the Coulomb excluding force between the spinning fibers(in the horizontal direction)are the two main factors to form the fibers. During the power off, one copper thread was rotted at hight speed to spin the fiber rope. The morphologies of helical fiber were observed by scanning electron microscopy (SEM). Experimental results show that the distance between the two parallel upright copper threads had a significant impact on the morphology. The formation mechanism of fiber rope was discussed.This work investigates the fabrication of the ultrafine fibers by polyvinylpyrrolidone (PVP) sol/titanium n-butyloxide (Ti(OC4H9)4) using the electrospinning technique. The bicomponent fibers of PVP/Ti(OC4H9)4 are heat treated at 200℃and calcined at 550℃TiO2 nanofibers with a diameter of 60-300 nm were fabricated. Thin carbon films were deposited on the surface of the TiO2 nanofibers by chemical vapor deposition (CVD). The morphological structure of the ultrafine fibers has been studied by means of infrared (FT-IR) spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Comparing with TiO2 nanofibers the carbon film deposited TiO2 fibers exhibit higher photo-catalytic activity toward the degradation of methylene blue.This work investigates the fabrication of the ultrafine fibers by polyvinylpyrrolidone (PVP) sol/titanium n-butyloxide (Ti (OC4H9)4) and polyvinylpyrrolidone (PVP) sol/zinc acetate [Zn (CH3COO)2] using the electrospinning technique. The bicomponent fibers of PVP/Ti (OC4H9)4 PVP/and Zn (CH3COO)2 are heat treated at 200℃and calcined at 550℃. The structure of the ultrafine fibers has been studied by means of infrared (FT-IR) spectrum, scanning electron microscopy (SEM), and X-ray diffraction (XRD). Comparing with TiO2 nanofibers the TiO2-ZnO nano-fibers exhibit higher photo-catalytic activity toward the degradation of methylene blue.