Influence of oxygen deficiency on the synthesis of tungsten oxide and the photocatalytic activity for the removal of organic dye

Active removal of waste dye pollutants using Ta3N5/W18O49 nanocomposite fibres

“…4b ; for each component, the separation between the 4f 5/2 and 4f 7/2 spin states has been assigned the characteristic value of 2.17 eV 77 . According to previous literature, the 4f 7/2 peak attributed to the W 6+ ion is centred at a binding energy of between 35.4 eV and 36.7 eV, while those of W 5+ and W 4+ appear in the ranges 34.0–35.0 eV and 32.2–34.1 eV, respectively 54 , 55 , 60 , 73 – 76 , 78 – 81 . In the present case, it is demonstrated in Fig.…”

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

“…Some recent reports also suggest that the oxygen deficiency results in the formation of oxygen-vacancy (V O ) states above and partly overlap with the VB. 105,106 This leads to an extension of the VB and narrows the band gap, which then expands the photo-response of WO 3−x toward the longer wavelength range. 90 projection of cubic pyrochlore-type WO 3 •0.5H 2 O in the [110] direction (small circles represent water molecules) (c), 91 As for WO X •nH 2 O photocatalysts, they generally show smaller E g than their dehydrated counterparts due to the weaker binding energy, thus exhibiting larger light absorption ranges.…”

WO3-decorated ZnO nanostructures for light-activated applications

“…1c), though compatible with W(VI) in an oxide environment, was slightly lower than typical literature values usually reported for pure WO 3 . 32,38,50,[53][54][55] The O1s signal (Fig. 1d) displayed similar features for the analyzed specimens.…”