Enhanced photocatalytic performance of Mg2+ doped Bi2WO6 under simulated visible light irradiation.

Mg²⁺ doped Bi₂WO₆ photocatalysts were synthesized through a hydrothermal method. Chemical compositions, morphologies, and photocatalytic activities of the products were studied. The Mg²⁺ doped Bi₂WO₆ was constructed by many loosely connected nanosheets and the surface area was greatly increased. The crystal lattice was distorted and the absorption edges were red-shifted after Mg²⁺ doping. When added 1.0% molar ratio of Mg(NO₃)₂ in the precursor, the Mg²⁺ doped Bi₂WO₆ product showed the best photocatalytic activity, and 94.1% RhB was decomposed after 45 min irradiation, which was 24.6% higher than that of the undoped one. Reasons for the improved photocatalytic activity were proposed. [ABSTRACT FROM AUTHOR]