Description:
Superoxide anions and hydroxyl radicals are vital reactive oxide species (ROS) in the photocatalytic process. In this study, a novel triple-doped bismuth tungstate (Yb/Er/Pr-Bi 2 WO 6 ) superior photocatalyst was constructed using hydrothermal method. The yield of superoxide anions and hydroxyl radicals are concurrently boosted by the synergistic effect for Yb/Er/Pr triple-doping. The X-ray photo-electron spectra confirmed the existence of oxygen vacancy and Pr 4+ /Pr 3+ redox center, which can act as trap electron center to produce more superoxide anions and promote electron-holes pairs separation. Meanwhile, Yb and Er doping observably regulated the valence band position of Bi 2 WO 6 from 2.39 V to 2.63 V, which is beneficial to produce more hydroxyl radicals. Comprehensive characterization illustrate that Yb/Er/Pr-Bi 2 WO 6 shows superior performance in photocatalytic activity, photocarrier separation and light absorption efficiency compared with the pristine Bi 2 WO 6 , single-doped Bi 2 WO 6 and co-doped Bi 2 WO 6. The research provides a simple and valid method for enhancing the visible-light-responding photocatalytic property and exploring the possible enhanced photocatalytic performance mechanism