Bi2WO6 was modified with MnO x 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 MnO x loaded on the surface of flower-like Bi2WO6, where MnO x exists as a mixed-valence manganese of Mn3+ and Mn4+ as verified by XPS. The photocatalytic activity of the MnO x/ Bi2WO6 composites was evaluated by using rhodamine B ( RhB) as a target organic pollutant under visible light irradiation. The as-prepared MnO x/ Bi2WO6 composites exhibited much higher photocatalytic activities than pure Bi2WO6. The enhanced activities were attributed to the interfacial transfer of photogenerated holes from Bi2WO6 to MnO x, 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 MnO x for the enhancement of visible light performance was proposed. [ABSTRACT FROM AUTHOR]