Abstract
Different TiO2–WO3 nanotubular (TWNs) electrodes were fabricated by in situ anodization of titanium in a single-step process using sodium tungstate as the tungsten source. The morphology and structure were characterized by field-emission scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. Optical properties were investigated by ultra UV–Vis diffuse reflectance spectra. The resulting TWNs showed a tube diameter of 80–110 nm, wall thickness of 20–40 nm and tube lengths in the range of 7–8 μm. The visible light photocatalytic activity of the TWNs electrodes was evaluated by measuring the degradation of methylene blue dye under simulated sunlight conditions and compared with photo-catalytic activity of pure TiO2 nanotubes (TNs). The results showed that TWNs electrodes have excellent photo-catalytic performance. The sample C, that formed by anodic oxidation in a DMSO electrolyte containing 4 g/l sodium tungstate, exhibited better photo-catalytic activity than the TNs and TWNs fabricated using other W concentrations under Xe illumination. The anodization process developed in this study is facile, reproducible, and inexpensive, and can be easily scaled up, thereby pioneering the fabrication of high performance photo-catalysts with promising environmental applications.
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Momeni, M.M., Ghayeb, Y. & Davarzadeh, M. Electrochemical construction of different titania–tungsten trioxide nanotubular composite and their photocatalytic activity for pollutant degradation: a recyclable photocatalysts. J Mater Sci: Mater Electron 26, 1560–1567 (2015). https://doi.org/10.1007/s10854-014-2575-x
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DOI: https://doi.org/10.1007/s10854-014-2575-x