Visible-Light Photocatalysis with WO3/TiO2 Nanocomposite Fiber Sponges Prepared via Solution Blow-Spinning Process

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Jate Panichpakdee, Sarat Nuchapong, Busarin Noikaew, Saengdeon Doungdaw, and Siriporn Larpkiattaworn


Three-dimensional nanocomposite fiber sponges consisting of tungsten trioxide (WO3) and titanium dioxide (TiO2) as visible-light photocatalysts were successfully prepared by solution blow-spinning process in combination with a calcination process (450 °C). The precursor solution of tungstic acid (H2WO4)/tetrabutyl titanate (Ti(OBu)4)/polyvinyl pyrrolidone (PVP) with various molar percentage ratios of tungsten to Ti (i.e., 0.5, 1.0, 3.0, and 5.0) in 75/25 w/w mixture of ethanol and acetic acid were prepared and blown-spun. Smooth fiber morphologies and average fiber diameters in a range of 480 nm to 645 nm before calcination and 351 nm to 479 nm after calcination were observed by a scanning electron microscope (SEM). The presence of WO3 within the nanocomposite fiber sponges was found by using X-ray diffractometer (XRD). The photocatalytic properties of the WO3/TiO2 nanocomposite fiber sponges were investigated by photocatalytic degradation of methylene blue solution under both UV- and visible-light radiation. Results showed that the WO3/TiO2 nanocomposite fiber sponges at molar percentage ratios of 5.0 exhibited the highest activity under both UV- and visible-light radiation.


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