contamination of organic pollutants in water has brought a challenge to sustainable environment and human health.Visible-light-induced photocatalysts, such as B2WO6, Ag3PO4, WO3 and g-C3N4, have attracted much attention for their good photodegradation efficiency and no secondary environmental pollution.Among these visible light photocatalysts, B2WO6 possesses the small bandgap, large specific surface area and excellent chemical stability, which is benefit for pollutant adsorption and degradation.Generally, its photocatalytic performance is seriously dependent on the morphology and structure.Hence, hollow B2WO6 nanostructures have been successfully synthesized by using PVP modified hydrothermal method, and their morphology and structure are characterized by SEM, TEM, XRD, FT-IR, and UV-vis analysis.A series of controlling experiments indicate PVP play an important role in the formation of the hollow hierarchical structure.Without adding PVP, the B2WO6 presents the solid sphere-like morphology.When the small amount of PVP added, the surface of B2WO6 is split, and the hollow flowerlike morphology is formed.The size of samples also slightly increases with the increase of PVP.After investigated by FT-IR, PVP is found to adsorb on the surface of B2WO6 by a strong donor-acceptor interactions via C=O bonds, which lead to an enhanced adsorption capacity.As the results, PVP assisted B2WO6 nanoflower exhibits improved activities and stabilities on RhB dye degradation, which could be potentially used for practical waste water treatments.