TiO₂‐Modified Flower‐Like Bi₂WO₆ Nanostructures with Enhanced UV‐Vis Photocatalytic Activity

Abstract

Anatase TiO 2 -modified flower-like Bi 2 WO 6 nanostructures were prepared by a simple hydrothermal reaction followed by layer-by-layer deposition and calcination. The photocatalytic activity was evaluated using Brilliant Red X3B, an anionic azo dye, as the target organic pollutant under UV-Vis light irradiation. The experiment results showed that the photocatalytic activity of the hybrid increases first and then decreases with increasing loading amount of TiO 2 . The hybrid coated with four layers of TiO 2 (containing 20 wt-% TiO 2 ) showed the highest photocatalytic activity, which is 10.45 and 3.20 times higher than that of pure Bi 2 WO 6 and TiO 2 , respectively. The improved photocatalytic performance of TiO 2 -modified Bi 2 WO 6 nanostructures could be ascribed to the improved lightharvesting ability, efficient photo-generated electron-hole separation, and enhanced adsorption of the dye. This work may shed light on the design of complex architectures and the exploitation of their potential applications.

SPR effect of bismuth enhanced visible photoreactivity of Bi2WO6 for NO abatement

“…From Fig. 5, it can be seen that the optical absorption edge of the yellowish Bi2WO6 (sample S0) is about 436 nm corresponding to a bandgap of 2.84 eV, consistent with earlier reports [26,30].…”

“…Despite this attractive property, the visible photoreactivity of Bi2WO6 is not high enough for practical applications [24,29]. According to literature, the apparent quantum efficiency of Bi2WO6 at 420 nm is less than 5% [30]. Up to now, many strategies have been used to improve the photocatalytic activity of Bi2WO6 such as controlling the morphology [26,29], surface modification [27,29,31], ion doping [32], introducing defects [33] and forming heterojunctions [34].…”

Three‐dimensional TiO 2 /Bi 2 WO 6 hierarchical heterostructure with enhanced visible photocatalytic activity

“…The reason should be attributed to the interaction between Bi 2 WO 6 and TiO 2 . On the basis of the relative energy level of Bi 2 WO 6 and TiO 2 [18, 19], the local electric field at the TiO 2 /Bi 2 WO 6 interface pushes the photo‐excited electrons towards the conduction band of Bi 2 WO 6 , and simultaneously photo‐generated holes on the valence band of Bi 2 WO 6 migration to that of TiO 2 . The electrons can be effectively collected by Bi 2 WO 6 and the holes can be effectively collected by TiO 2 .…”

Photocatalyst Bi(OH)SO4 · H2O with High Photocatalytic Performance

“…4 shows the CV and VB of some Bi-based photocatalysts. The valence bands of Bi2MoO6 [48], Bi2WO6 [49], BiPO4 [48], BiVO4 [50] and Bi2SiO5 [51]…”