Photochemical reactions of g-C3N4-based heterostructured composites in Rhodamine B degradation under visible light

作者：Liu, Yumeng; Wang, Junpeng; Yang, Ping^*

来源：RSC Advances, 2016, 6(41): 34334-34341.

DOI：10.1039/c6ra04430a

• ENHANCED PHOTOCATALYTIC ACTIVITY
• GRAPHITIC CARBON NITRIDE
• HYBRID PHOTOCATALYSTS
• PERFORMANCE
• HETEROJUNCTIONS
• MICROSPHERES
• FABRICATION
• NANOSHEETS

Highly efficient visible-light-driven Ag2O/g-C3N4, Ag/g-C3N4, and BiOBr/g-C3N4 heterostructured photocatalysts were prepared by solution synthesis methods at room temperature. Compared with Ag/g-C3N4 (1 : 30 mass ratio) and Ag2O/g-C3N4 (2 : 1 mass ratio) photocatalysts, the BiOBr/g-C3N4 composite (1 : 3) displayed enhanced photocatalytic activities for Rhodamine B (RhB) degradation under visible-light irradiation. The reaction kinetics of phenol RhB dye photodegradation of Ag2O/g-C3N4 (1 : 1, 2 : 1, 4 : 1 mass ratios) and BiOBr/g-C3N4 were fitted with the pseudo-first-order model, ln(C-0/C) = kt, while the data of Ag/g-C3N4 and pure g-C3N4, Ag2O/g-C3N4 (1 : 20 mass ratio) were fitted with the zero-order model. The former has enhanced photocatalytic activity, and BiOBr/g-C3N4 composites exhibit the highest degrading rate for RhB. The enhanced photocatalytic activity of two dimensional BiOBr/g-C3N4 photocatalysts was mainly attributed to the formation of type II p-n heterojunctions, as well as the well-matched band gap and the synergetic effects between two components, which accelerate the separation efficiency of photogenerated electrons-holes at the interface. Finally, possible photocatalytic and charge separation mechanisms of Ag2O/g-C3N4 and BiOBr/g-C3N4 composites were proposed via active species capture experiments.

• 出版日期2016
• 单位济南大学