Visible-light photocatalytic activity of graphene oxide-wrapped Bi2WO6 hierarchical microspheres

- GO/Bi2WO6 are readily fabricated by facile bubbling pretreatment and freeze drying.
- GO/Bi2WO6 possess excellent photocatalytic activity under visible light irradiation.
- The visible light activity of GO/Bi2WO6 is affected by the amount of GO.
- The photostablity of GO is due to the photo-generated electrons transfer to Bi2WO6.