摘要
Bi2WO6 was modified with MnOx via a photodeposition method. Multiple techniques including XRD, SEM, TEM, UV-Vis and XPS were applied to investigate the structures, morphologies and optical characteristics of the as-prepared sample. The nanostructured composites were formed with MnOx loaded on the surface of flower-like Bi2WO6, where MnOx exists as a mixed-valence manganese of Mn3＋ and Mn4＋ as verified by XPS. The photocatalytic activity of the MnOx/Bi2WO6 composites was evaluated by using rhodamine B （RhB） as a target organic pollutant under visible light irradiation. The as-prepared MnOx/Bi2WO6 composites exhibited much higher photo- catalytic activities than pure Bi2WO6. The enhanced activities were attributed to the interfacial transfer of photo- generated holes from Bi2WO6 to MnOx, leading to effective way to improve photocatalytic efficiency, which may be extended to a strategy for other semiconductor. Based on the experimental results, a possible mechanism of MnOx for the enhancement of visible light performance was proposed.
Bi2WO6 was modified with MnOx via a photodeposition method. Multiple techniques including XRD, SEM, TEM, UV-Vis and XPS were applied to investigate the structures, morphologies and optical characteristics of the as-prepared sample. The nanostructured composites were formed with MnOx loaded on the surface of flower-like Bi2WO6, where MnOx exists as a mixed-valence manganese of Mn3＋ and Mn4＋ as verified by XPS. The photocatalytic activity of the MnOx/Bi2WO6 composites was evaluated by using rhodamine B （RhB） as a target organic pollutant under visible light irradiation. The as-prepared MnOx/Bi2WO6 composites exhibited much higher photo- catalytic activities than pure Bi2WO6. The enhanced activities were attributed to the interfacial transfer of photo- generated holes from Bi2WO6 to MnOx, leading to effective way to improve photocatalytic efficiency, which may be extended to a strategy for other semiconductor. Based on the experimental results, a possible mechanism of MnOx for the enhancement of visible light performance was proposed.
