Photo-Fenton Degradation of Tetracycline Boosted by Charge Redistribution in g-C 3 N 4 with Fe–N 2 Configuration and O/P Dual Doping

作者：Xiao Zhang, Menglin Zhang, Zhiren Guo, Xiang Li, Ting Liu, Jinying Li, Dongxiang Zhang, Xiyan Xu · 发表于：Langmuir · 年份：2025 · DOI：10.1021/acs.langmuir.5c02317 · 被引用次数：4 · 研究领域：Advanced Photocatalysis Techniques、Luminescence Properties of Advanced Materials、Electronic and Structural Properties of Oxides

The persistent contamination of aquatic environments by tetracycline (TC) necessitates advanced remediation strategies. Herein, a ternary Fe–O–P-co-modified graphitic carbon nitride (FOPCN x ) was synthesized via structural integration of Fe–N 2 configurations with O/P dual doping for efficient TC degradation in a solar-driven photo-Fenton system. This study pioneers the synergistic coupling of Fe–N 2 coordination and heteroatomic O/P substitution to optimize charge dynamics. Comprehensive characterization confirmed the formation of Fe–N 2 active sites and aromatic structures incorporated with the aromatic group, which collectively enhanced visible-light absorption, suppressed electron–hole recombination, and facilitated charge carrier redistribution. The optimized FOPCN2 demonstrated exceptional photoelectric efficiency (3.7-fold higher photocurrent density than pristine g-C 3 N 4 ) and achieved 98.9% TC removal within 40 min of irradiation with a kinetic constant of 0.113 min –1, outperforming conventional systems. Mechanistic studies revealed dual enhancement pathways: Fe–N 2 sites promoted electron transfer and Fe(III)/Fe(II) cycling, while the O/P dual doping enabled electron delocalization for improved charge mobility. The system exhibited remarkable pH adaptability (3–7), robust resistance to inorganic anions, and universal degradation capability for mixed organic pollutants. Three TC degradation pathways were identified through intermediate analysis, with radical trap...