Abstract
A novel three-dimensional (3D) hierarchical rose-like Bi2WO6 (BWR) superstructure for use as an efficient visible-driven photocatalyst has been fabricated using a facile template-free hydrothermal strategy to integrate sequentially two-dimensional (2D) nanoplates into the 3D hierarchical structure. The formation mechanism was briefly analyzed. The 3D hierarchical superstructure facilitated migration and separation of photogenerated charge carriers due to the stacked hierarchical subunits, increased surface area for pollution adsorption, and more exposed active sites for surface redox catalysis. Benefiting from its excellent structural features, the BWR exhibited enhanced performance for photodegradation of RhB and photooxidation of NO under visible-light irradiation compared with irregular Bi2WO6. In addition, a trapping experiment was conducted to reveal which active species are involved in the photodegradation of RhB.
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