▎ 摘　　要

In this study, a novel three-dimensional (3D) reduced graphene oxide-g-C3N4 nanosheets-AgBr (RGO-CNN-AgBr) composite aerogel visible light photocatalyst was synthesized by hydrothermal method. In this ternary composite system, AgBr anchored onto g-C3N4 nanosheets could improve the absorption rate of visible light and promote the separation of photogenerated electron-hole pairs simultaneously. The introduction of RGO could not only provide a fast channel for electron transfer, but also form a looser 3D porous structure, which could increase the specific surface area and cause the multiple reflections of incident light to promote absorption of light and adsorption of reactants. Based on these synergistic effects, the ternary composite photocatalyst exhibited excellent photodegradation properties. The results showed that under the same conditions, the removal rate of methyl orange by RGO-CNN-AgBr was improved to a certain extent relative to g-C3N4 nanosheets (CNN), up to 90%. Furthermore, the photocatalytic activity of RGO-CNN-AgBr decreased only slightly after four degradations, revealing the excellent stability. The photocatalytic mechanism of RGO-CNN-AgBr was explained, which embodied the good prospect of this composite photocatalyst in the practical application of pollutant degradation.