2D/2D g-C3N4/TiO2 with exposed (001) facets Z-Scheme composites accelerating separation of interfacial charge and visible photocatalytic degradation of Rhodamine B

Abstract

Z-scheme heterojunction was successfully constructed with (001)-TiO2 and g-C3N4 via electrostatically self-assemble. Z-Scheme heterojunction nanocomposites improve separation efficiency of photogenerated e−-h+ pairs, which strengthen visible photocatalytic elimination for Rhodamine B. The g-C3N4 with narrower bandgap not only forms a stable phase interface with (001)-faceted TiO2 nanosheets, but also provides high productivity of photo-excited charge carries. Meanwhile, the layered graphite carbon in g-C3N4 owns an excellent ability to transfer electrons. The RhB degradation rate of the g-C3N4/(001)-faceted TiO2 hybrid reach up to 99.9% under the visible light for 2 h. This study provided an efficient g-C3N4/(001)-faceted TiO2 photocatalyst with Z-Scheme heterojunction structure has emerged as a promising approach to perfect the photocatalytic capacity of photocatalysts.