Construction of Bi2WO6 homojunction via QDs self-decoration and its improved separation efficiency of charge carriers and photocatalytic ability

The Bi2WO6 homojunction is successfully synthetized via simple adjusting the amount of raw materials within a transitory hydrothermal reaction of 2 h. Such unique homojunction is constructed through the overgrowth of QDs on the nanoflake unit surfaces of the Bi2WO6 hierarchical structure, which alters the optical absorption property of the samples owing to quantum effect. Photocurrent responses and PL spectra indicate Bi2WO6 homojunction can effectively separate electron-hole pairs and suppress their recombination. The as-prepared samples show the higher efficiency for the photocatalytic degradation of the typical RhB dye compared with the previous reported hierarchical structured Bi2WO6 under visible light. This work provides a new strategy for improving photodegradation activity of Bi2WO6 photocatalyst.