Pt‐V₂O₅/NT and Pt‐WO₃/NT Titanate Nanotubes with Strong Photocatalytic Activity under Visible Light

Abstract

Photocatalytic degradation of Rhodamine B was carried out by decorated V2O5/NT and WO3/NT titanate nanotubes with Pt (0.3 wt. %) under visible light irradiation. The effect of parameters such as titanic acid phase, surface area and photocatalyst load on the deactivation of the photocatalytic degradation of Rhodamine B were studied. Photoatalysts were characterized by SBET, XRD, UV‐vis, XPS, HR‐TEM, and H2‐TPR. We found that Pt‐WO3/NT photocatalyst reached 90% of dye degradation in 60 min. WO3/NT reached 60% after 90 min under 450‐nm visible light irradiation and pH neutral. The incorporation Pt nanoparticles into WO3/NT and V2O5/NT supports increased remarkably the photocatalytic activity during degradation of Rhodamine B. After reaction, an evolution from VO2 to V2O5 was observed. We also found the transition from W5+ to W6+. The transition from Pt0 to Pt2+ was also observed. We concluded that the presence of Pt hinders the oxidation of the oxygen species on the surface of the titanate nanotubes.

Influence of deposition order of dual active components on the NH3-SCO performance of the bimetallic Pt–V system supported on TiO2

“…39 The peaks at 515.0, 515.5, 515.6 and 515.7 eV could be ascribed to V 3+ species, the peaks at 515.8, 516.3 and 516.5 eV could be attributed to V 4+ species, and the peaks at 516.8, 516.9, 517.1 and 517.5 eV could be assigned to V 5+ species. 40 As shown in Table S3 (ESI†), the V 3+ /(V 3+ + V 4+ + V 5+ ) ratio of the V 0.5 /Pt 0.04 /TiO 2 catalyst (38.75%) was obviously higher than those of the V 0.5 /TiO 2 (28.87%), Pt 0.04 /V 0.5 /TiO 2 (24.50%) and Pt 0.04 V 0.5 /TiO 2 (28.72%) catalysts. Since V 3+ species possessed strong ability to adsorb and activate O 2 in the gas phase, 24 abundant V 3+ species on the surface of the V 0.5 /Pt 0.04 /TiO 2 catalyst might be conducive to the catalytic oxidation for NH 3 .…”