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New Insights into Bi 2 WO 6 Properties as a Visible-Light Photocatalyst

2013; American Chemical Society; Volume: 117; Issue: 44 Linguagem: Inglês

10.1021/jp4048192

1932-7455

Tamar Saison, Pierre Gras, Nicolas Chemin, Corinne Chanéac, Olivier Durupthy, Vlasta Brezová, Christophe Colbeau‐Justin, Jean‐Pierre Jolivet,

Perovskite Materials and Applications

Bismuth tungstate has attractive photocatalytic properties under visible light. A better understanding of the origin of that good activity should allow its control and its optimization. An improved photocatalytic activity to different pollutants was obtained using bismuth-based oxide obtained by microwave-assisted synthesis combined with the addition of sodium dodecylsulfate as a size tailoring agent. It is shown using electron paramagnetic resonance that bismuth tungstate is able to generate hydroxyl radicals in aqueous aerated solution, but no superoxide radical anions are formed. The catalytic efficiency relative to TiO2 could be associated to differences in the number of excitons generated, to their lifetimes as holes and electrons in the semiconductor, and to valence and conduction band positions.