Research on the Preparation of MIL-68(Fe)/g-C3N4 Materials for the Simultaneous Photocatalytic Removal of Cr(Ⅵ) and Tetracycline

Heterostructure composite materials are widely used in environmental remediation due to their excellent photocatalytic activity. This study synthesized MIL-68(Fe) on the surface of g-C ₃ N ₄ using an in-situ synthesis method to form a composite material with high specific surface area and superior photocatalytic performance. The morphology, crystal structure, chemical composition, and photocatalytic properties of this material were characterized in detail. Experimental results showed that MIL-68(Fe)/g-C ₃ N ₄ composite material achieved a 99.9% removal rate of Cr(Ⅵ) and a 90% degradation rate of tetracycline within 80 minutes. Compared with MIF-68(Fe) or g-C ₃ N ₄ alone, the tetracycline degradation rate and Cr(Ⅵ) reduction rate of the composite material increased significantly, which greatly enhanced its photocatalytic activity. This enhancement can be attributed to the composite material exhibiting nearly five times higher specific surface area than MIL-68(Fe) alone. Additionally, after doping with g-C ₃ N ₄ , the UV absorption of MIL-68(Fe)/g-C ₃ N ₄ composite material decreased, and the absorption edge showed a red shift, indicating that MIL-68(Fe)/g-C ₃ N ₄ -3 may have better visible light response. This work demonstrates that MIL-68(Fe) is an efficient photocatalyst and provides new insights for subsequent research in the field of photocatalytic degradation using MIL-68(Fe).