Hydrothermal synthesis of Bi2WO6 and photocatalytic reduction of aqueous Cr(VI) under visible light irradiation

[摘要] Bi2WO6was synthesized via a facile hydrothermal method using different inorganic acid or alkali varied pH of the solution at 180 for 12 h, and characterized by X-ray diffraction, FESEM and photocurrent. Furthermore, the photocatalytic activity of Bi2WO6was investigated in the reduction of aqueous Cr(VI) under visible light (λ > 420 nm) irradiation. As a result, assynthesized Bi2WO6was an orthorhombic phase, and well-crystallized with 3D hierarchical structure constructed by arranged 2D layers of nanoplates. All the as-synthesized Bi2WO6exhibited the visible light photocatalytic activities on aqueous Cr(VI), and Bi2WO6-(2) exhibited the highest photocatalytic reduction efficiency based on much higher separation and transfer efficiency of photogenerated electrons and holes.

[发布机构] School of Chemistry and Chemical Engineering, Xuzhou University of Technology, Xuzhou; 221111, China^1

[关键词] Hierarchical structures;Hydrothermal methods;Photocatalytic activities;Photocatalytic reduction;Photogenerated electrons;Transfer efficiency;Visible light photocatalytic activity;Visible-light irradiation