Controllable synthesis and visible-light-responsive photocatalytic activity of Bi2WO6 fluffy microsphere with hierarchical architecture

► Various morphologies of Bi2WO6 are synthesized via a simple hydrothermal route without surfactant and template. ► The samples with hierarchical structure assembled of many nanosheets. ► The fluffy microsphere-like sample exhibits excellent photodegradation efficiency (99% in 20 min).