Influence of interface combination of reduced graphene oxide/P25 composites on their visible photocatalytic performance

Abstract

Reduced graphene oxide (RGO)/P25 composites are successfully synthesized by using a facile hydrothermal method, and Raman mapping images show that the P25 are very uniformly dispersed in the composite. The RGO/P25 composites are used in the photocatalysis of methyl orange under UV and visible light illumination. The degradation ratio for the 0.75 wt% RGO/P25 composite is the best with 100% degradation after 120 and 150 minutes of irradiation under UV and visible light, respectively, which is greatly enhanced compared with that of P25, especially in the visible light region. It is found that a good interface combination between RGO and P25 may improve the electric conductivity and lifetime of photo-induced electrons in the photodegradation process as well as enhance the light absorption, which may favor the efficient enhancement of the photodegradation rate of the RGO/P25 composite.