Preparation of AgBr/g-C3N5 composite and its enhanced photodegradation for dyes

A series of AgBr/g-C3N5 composites were prepared to improve the photocatalytic activity of g-C3N5. The photocatalytic property of AgBr/g-C3N5 composites was investigated using rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) as the target dyes. The results showed that AgBr/g-C3N5 composites can enhance the photodegradation efficiency of dyes due to the reduced recombination rate of electron/hole pairs and improved visible light response. In addition, sample 35 wt% AgBr/g-C3N5 composite was the optimal photocatalyst, which exhibited good photodegradation efficiency to RhB (88.5%), MO (63.1%) and MB (98.0%). Moreover, the 35 wt% AgBr/g-C3N5 composite had good stability and reusability. The main active species of 35 wt% AgBr/g-C3N5 composite in the photocatalytic degradation process was •O2–. This work confirmed that AgBr/g-C3N5 composites can be used for the degradation of organic pollutants in water.