Cyano-functionalized C₃N₅ Nanosheets Modified GdCdS Z-Scheme Heterojunction for Highly Efficient Photocatalytic...

A Z-scheme heterojunction photocatalyst composed of cyano-functionalized C₃N₅ nanosheets and GdCdS (GdCdS-C₃N₅CN) was successfully synthesized for enhanced photocatalytic uranium extraction. The incorporation of cyano groups fine-tuned the band structure of C₃N₅ and significantly improved its uranium adsorption performance. The composite demonstrated outstanding photocatalytic activity across a broad range of uranium concentrations and pH conditions, with a maximum uranium adsorption capacity of 484.5 mg/g, outperforming most reported C₃N₅-based catalysts. Photoelectrochemical and band structure analyses verified that the Z-scheme heterojunction promoted efficient interfacial charge separation while maintaining the strong reduction capability of C₃N₅CN and the oxidation ability of GdCdS. The material also exhibited excellent anti-interference properties and cycling stability, indicating strong potential for practical use in treating uranium-containing wastewater.