Ag@Bi2WO6Composites with High Visible‐Light‐Driven Photocatalytic Activities Prepared in UV Light Irradiation

Bi₂WO₆ microstructures were synthesized through hydrothermal process and Ag@Bi₂WO₆ composites were synthesized by simple UV light irradiation for 5 min using Bi₂WO₆ and AgNO₃ as raw materials. Ag@Bi₂WO₆ composites were characterized by X‐ray powder diffraction (XRD), field‐emission scanning electron microscopy (FE‐SEM), and UV‐Vis absorption spectrum (UV‐Vis). Few Ag deposited on the Bi₂WO₆ leads to an increase in photocatalytic activity, which clearly indicates that the recombination of photogenerated charge carrier between the hybrid orbital of Bi6s and O2p (valence band) to the empty W5d orbital is inhibited greatly in the Ag@Bi₂WO₆ composite. In addition, a few H₂O₂ will greatly enhance photocatalytic activity of Ag@Bi₂WO₆, and the proper reason is discussed.