Synthesis and characterization of electrospun nanocomposite TiO 2 nanofibers with Ag nanoparticles for photocatalysis applications

Abstract

Polycrystalline mixed-phase TiO 2 nanofibers embedded with 2.0% w/v Ag nanoparticles was prepared by the electrospinning technique. Calcination of dry Ag nanoparticles-titanium (IV) isopropoxide/PVP electrospun nanofiber mats in air at 510 °C for 24h yielded polycrystalline TiO 2/Ag nanofibers. The morphology and distribution of silver nanoparticles were observed by transmission electron microscopy (TEM), scanning TEM (STEM), and high-angle annular dark-field (HAADF) imaging. Mixed-phase anatase and rutile TiO 2 nanofibers were produced with Ag nanoparticles. High-resolution TEM lattice-fringe measurements showed good agreement with Ag (111), anatase (101), and rutile (110) phases. The photocatalytic activity of TiO 2/Ag nanofibers was compared to the photocatalytic activity of pure TiO 2 nanofibers by studying the photodegradation of methyl red dye under UV light irradiation, in a photoreactor. UV-visible absorbance spectra showed that the rate of decay of the dye in case of photodegradation by TiO 2/Ag nanofibers was 10.3 times higher than that by pure TiO 2 nanofibers. The retaining of the fiber morphology along with the increased surface area due to the addition of Ag nanoparticles can be believed to enhance the photocatalytic oxidation of methyl red dye. Copyright 2012 Srujan Mishra and S. Phillip Ahrenkiel.