In this study, a novel N, S-co-doped carbon-based Ag₃PO₄ composite photocatalyst (N,S-Ag₃PO₄@ACB) was synthesized using activated biochar (ACB) as a carrier and used for the efficient removal of norfloxacin (NOR), a typical bio-refractory antibiotic. We systematically investigated the degradation effects, actual wastewater treatment, the impacts of environmental factors, and the degradation pathways. The results show that N,S-Ag₃PO₄@ACB is essentially a p-n heterojunction with Z-scheme of Ag₂S/Ag₃PO₄/ACB composite containing Ag nanoparticles. After 120 min of irradiation, N,S-Ag₃PO₄@ACB removed 90.42% of an initial NOR concentration of 50 mg L^–1. The activation of graphitic N and the lone electron pairs of N and S, promoted rapid photogenerated charge transfer. Furthermore, the surface properties of ACB promoted free radicals generation, and the surface plasmon resonance effect of the Ag nanoparticles synergistically enhanced the photocatalytic activity. A new degradation intermediate of NOR was identified, and the degradation dynamics were elucidated with three main pathways.

本研究以活性生物炭（ACB）为载体合成了一种新型N,S共掺杂碳基Ag ₃ PO ₄复合光催化剂（N,S-Ag ₃ PO ₄ @ACB），并用于高效光催化剂的制备。去除诺氟沙星（NOR），一种典型的生物难治性抗生素。我们系统地研究了降解效果、实际废水处理、环境因素的影响以及降解途径。结果表明，N,S-Ag ₃ PO ₄ @ACB本质上是含有Ag纳米颗粒的Ag ₂ S/Ag ₃ PO ₄ /ACB复合材料的Z型pn异质结。照射 120 分钟后，N,S-Ag ₃ PO ₄ @ACB 去除了初始 NOR 浓度 50 mg L ^–1的 90.42%。石墨N以及N和S的孤电子对的活化促进了快速光生电荷转移。此外，ACB的表面特性促进了自由基的产生，Ag纳米颗粒的表面等离子体共振效应协同增强了光催化活性。鉴定出一种新的 NOR 降解中间体，并通过三个主要途径阐明了降解动力学。