Abstract: g-C₃N₄ (denoted as CN) was prepared using melamine as precursor system, and then treated with different volumes of HF to prepare fluorinated CN surface. The structure, morphology and electrochemical properties of the samples were characterized by XRD, SEM, FT-IR and UV-Vis DRS. The effects of surface fluorination on CN over the UV light induced photocatalytic degradation of rhodamine B (RhB) were preliminarily investigated. The results indicate that the surface electronic structure of CN can be rationally tuned by fluorine ions, thereby boosting the separation and transport of photoinduced charge carriers, ultimately enhancing the photocatalytic performance. Under optimized experimental conditions, the degradation rate of RhB by CN-0.2F sample can reach 47.9%, which is 1.6 times that of pure CN counterpart.