Preparation of the additive-modified α-Fe2O3/g-C3N4 Z-scheme composites with improved visible-light photocatalytic activity

The hollow α-Fe2O3 (S3) sample with high-activity was obtained by adding H2PO4− and Cu2+ ions via a hydrothermal processes, and the S3/g-C3N4 composites were synthesized by a simple method. The prepared hollow S3 with higher Ov concentration presented higher photocatalytic degradation activity. In contrast with the S3 and g-C3N4, the S3/g-C3N4 composite exhibited superior visible-light photocatalytic activity. The formation of the S3/g-C3N4 Z-scheme heterojunction improved the separation ability of the photoexcited carriers and the redox ability of the catalyst. The synergistic effect of heterojunction and photo-Fenton in the S3/g-C3N4 degradation system promoted the formation of active species, thereby enhancing the visible-light photocatalytic degradation efficiency of p-Nitrophenol. This study provides a fresh insight for p-NP removal in the wastewater. [Display omitted] •The (H2PO4− and Cu2+)-modified α-Fe2O3 with high-activity was obtained.•The S3/g-C3N4 Z-scheme composites were fabricated.•The S3/g-C3N4 degradation system could produce more active species.•The 0.3-1FCN composite exhibited the highest visible-light photocatalytic activity.