A Simple Method of Electrospun Tungsten Trioxide Nanofibers with Enhanced Visible-Light Photocatalytic Activity

Abstract

The present study involves the fabrication of tungsten trioxide (WO3) nanofibers by an electrospinning technique using polyvinyl pyrrolidone (PVP)/citric acid/tungstic acid as precursor solution. It was found that the PVP concentration was one of the most crucial processing parameters determining the final properties of WO3 nanofibers. The optimum concentration of PVP was from 75 to 94 g L−1. The average diameter of the nanofibers increases with increasing the PVP concentration, whereas it is decreased after sintering and orthorhombic structure were formed at 500 °C. The photocatalytic properties of the as-synthesized nanofibers were also investigated by degrading methylene blue and twofold efficiency was obtained compared with that of commercial WO3 microparticles.

Tungsten oxide-based visible light-driven photocatalysts: crystal and electronic structures and strategies for photocatalytic efficiency enhancement

“…11. These morphologies can be classified into zerodimensional (0D, e.g., spherical and pseudo-spherical NPs 102,[126][127][128] ), one-dimensional (1D, e.g., nanorods, 120 nanowires, 114 nanobelts, 129 nanofibers 130,131 and nanotubes 23 ), two-dimensional (2D, e.g., nanoplatelets, 132 nanoplates 48 and nanosheets 133 ) and three-dimensional (3D, e.g., porous interconnected structures, 134,135 core-shell structures [136][137][138][139] and hierarchical structures assembled by low-dimensional building blocks 46,51,[140][141][142][143][144] ) according to the dimensionality. A schematic illustration of simplified structures in different dimensionalities is demonstrated in Fig.…”

Visible-Light-Driven, Dye-Sensitized TiO2 Photo-Catalyst for Self-Cleaning Cotton Fabrics

“…The scanning electron microscope (SEM) images of the pure cotton, TiO 2 coated and dye/TiO 2 -coated cotton fabrics are given in the Figure 12. Coatings 2017, 7,192 11 of 13…”

Effect of Different Anions Upon the WO3 Morphology and Structure

“…Tungsten oxides are one of the most intensively investigated metal oxides due to their promising properties in the field of catalysis [1,2], photocatalysis [3][4][5][6], electrochromism [7][8][9], photochromism [10] or gas sensing [3,[11][12][13][14]. Tungsten oxides can be prepared in many ways, such as wet chemical processes [10], hydro-or solvothermal [6,[15][16][17] or chemical solution routes [5], electrospinning [18], spray pyrolysis [19] or annealing [20].…”