A novel p-n heterojunction of Ag2O/Bi4Ti3O12 nanosheet with exposed (0Â 0Â 1) facets for enhanced visible-light-driven photocatalytic activity

- Bi4Ti3O12 nanosheet with highly exposed (0 0 1) facets were prepared.
- Ag2O was decorated on Bi4Ti3O12 nanosheet to enhance its photocatalytic activity.
- Synergistic effects of internal electric fields and p-n heterojunction were obtained.
- Enhancement of photocatalytic performance was attributed to the synergistic effects.

The Bi4Ti3O12 nanosheet with highly exposed (0 0 1) facets was combined with Ag2O to form the p-n heterojunction photocatalyst, which showed distinctly increased visible light driven activity. The enhanced photocatalytic performance can be attributed to the synergetic effects of the internal electric field between Bi4Ti3O12 nanosheets and the formation of p-n heterojuction between two semiconductors. This results may present a promising method to design new visible light photocatalysts for organic pollutant degradation.