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• W2021565478 abstract "Vanadium oxide incorporated titania nanoparticles (VIT), with an adjustable V/Ti ratio from 8.61% to 28.19%, are prepared to monitor the influence of the oxidation state of vanadium on the redox behavior of VIT. Two oxidation states of vanadium, V5+ and V3+, are deconvoluted from the vanadium 2p3/2 peak of X-ray photoemission spectra (XPS) of VIT-1 (V/Ti = 8.61%) and VIT-2 (V/Ti = 18.84%), respectively. The ratio of V3+ : V5+ decreases 5.46 times from VIT-1 (4.97 : 1) to VIT-2 (0.91 : 1). As the V/Ti ratio increased to 28.19% (VIT-3), a new V4+ oxidation state is derived from the vanadium 2p3/2 peak, besides V3+ and V5+. The ratio of peak area among V3+ : V4+ : V5+ is 0.35 : 0.85 : 1. Apparently, the ratio of V3+ in VIT samples decreases as the ratio of V/Ti increases. In the photo-degradation of salicylic acid (SA), the rate constant (kcat) for P-25 (0.345 min−1), VIT-3 (0.552 min−1), VIT-2 (0.891 min−1), and VIT-1 (1.23 min−1) is in the ratio of 0.28 : 0.49 : 0.73 : 1. The experimental results show that the incorporation of vanadium oxide in TiO2 enhances the photo-degradation efficiency for SA. Moreover, the photo-degradation rate of the sample with the lowest V/Ti ratio (VIT-1) is ∼2 times faster than that of the one with the highest V/Ti ratio (VIT-3). The high ratio of V3+ existing in VIT-1 is due to the dominated reduction reaction (V5+–O–V5+)O4 → (:V3+–O–V5+)O3 in the low V/Ti ratio environment. If the V/Ti ratio is increased to 28.19%, the polymerization reaction, (V5+–O–V5+)O4 + (:V3+–O–V5+)O3 → (V5+–O–V4+–O–V4+–O–V5+)O6, has the kinetic priority to take place at the active center of VIT. Thus, the V4+ is created and keeps growing quickly. Accordingly, the ratio of V3+ existing in vanadium oxide is an important indicator to monitor the photocatalytic behavior of VIT." @default.
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• W2021565478 date "2013-01-01" @default.
• W2021565478 modified "2023-09-24" @default.
• W2021565478 title "Photo-catalytic behavior of vanadia incorporated titania nanoparticles" @default.
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• W2021565478 doi "https://doi.org/10.1039/c3cy00053b" @default.
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