Preparation of BiOl/g-C ₃ N ₄ Composites with Improved Photocatalytic Performance

The BiOI/g-C 3 N 4 compoistes with a sphere-like shape were successfully synthesized via a facile solvothermal method. The morphology, phase and optical properties were characterized by SEM, TEM, XRD and UV-Vis DRS technologies, respectively. Results showed that the BiOI/g-C 3 N 4 composites incorporated lamellar structure of g-C 3 N 4 and flower-like structure of BiOI uniformly loaded on the surface of g-C 3 N 4 , which caused to form a heterojunction structure for effective separation of charge carriers. Moreover, the photocatalytic degradation performance of as-prepared BiOI/g-C 3 N 4 composites with various ratios was further investigated. Results indicated that the BiOI/g-C 3 N 4 (1:2) composite exhibited wonderful photocatalytic performance in application of denigrating TC which could be removed completely under visible light irradiation for 120 min. The degradation rate of TC still reached 86% after the composite be used for five times, which showed excellent higher stability of the used composite. Results further exhibited that superoxide radical (·O 2- ) and hydroxyl radicals (·OH) were the main active species for photocatalytic degradation of TC, which illustrated a Z-scheme charge transfer mechanism of the BiOI/g-C 3 N 4 composites.