Abstract
Bismuth tungstate (Bi2WO6) particles as a visible light-responsive photocatalyst were prepared by a facile hydrothermal reaction method in a wide range of pH’s (1.5−8.0) in a feed solution, and the effects of calcination on photocatalytic activity were investigated. Change in pH affected their crystallite size, shape, assembling morphology, and specific surface area. The tungsten-to-bismuth ratio (W/Bi ratio) of Bi2WO6 gradually decreased with an increase in pH of the feed solution because of dissolution of tungstate in alkaline solution. The photocatalytic activities were evaluated with oxidative decomposition of acetic acid into carbon dioxide under ultraviolet and visible light irradiation. For Bi2WO6 samples of similar W/Bi ratio, the photocatalytic activity increased with an increase in their specific surface area. Spherical assemblies of Bi2WO6 polycrystalline flakes with a hierarchical architecture (flake-ball particles), which were prepared under the conditions of pH 1.2 and W/Bi ratio of 0.55, ex...
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