Enhanced photocatalytic activity of bismuth-tungsten mixed oxides for oxidative decomposition of acetaldehyde under visible light irradiation

Russelite bismuth tungstate (Bi2WO6) flake-ball particles prepared by a hydrothermal reaction method have been reported to be visible-light-responsive photocatalysts for mineralization of organic compounds. Here, we report new bismuth-tungsten mixed oxide particles with a tungsten-to-bismuth ratio (W/Bi ratio) in feed of 1.0, which is two-times higher than the stoichiometric ratio of Bi2WO6 (W/Bi = 0.50). Compared to the conventional Bi2WO6 flake-ball particles, the tungsten-rich particles exhibited a narrow band gap (2.70 eV), large specific surface area due to the rectangular platelet nanostructure, and high level of photocatalytic activity for oxidative decomposition of acetaldehyde.

Figure optionsDownload as PowerPoint slideHighlights
► New bismuth-tungsten mixed oxide particles with W/Bi ratio of 1.0.
► The ratio is two-times higher than the stoichiometric ratio for Bi2WO6.
► Single-crystalline platelets with new crystal composition.
► Large specific surface area and narrow band gap of 2.70 eV.
► Enhanced visible-light-responsive photoactivity for acetaldehyde decomposition.