▎ 摘　　要

In this study, graphene oxide (GO) and a carbon 2D materials (g-C3N4 nanosheets) were combined to construct gC3N4/GO nanosheets through 7C-7C stacking interaction. Moreover, Ag+ ions were reduced to Ag nanoparticles and further grafted onto the g-C3N4/GO nanosheets (Ag@g-C3N4/GO) to impart the dual functionality of photocatalytic degradation and surface enhanced Raman scattering (SERS) detection. The Ag@g-C3N4/GO SERS substrate can be used to detect biomolecules (adenine) and organic pollutants (methylene blue). The X-ray diffraction, scanning electron microscopy, and Raman spectroscopy observations confirmed that g-C3N4 was successfully stacked onto the GO nanosheets. In addition, the Ag@g-C3N4/GO SERS substrate displayed photocatalytic ability. Pollutants in water were photodegraded by irradiation with visible light (405 nm), making the substrate self-cleaning and reusable. Thus, the Ag@g-C3N4/GO SERS nanosheets has potential for application in the photocatalytic degradation of water pollutants and detection of biomolecules.